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post #151 of 409 Old 04-06-2013, 11:58 AM
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Re: Converting to EFI. Finally...A little help

Yes, the single grey wire (IIRC it's grey), runs the fuel pump.

The prime connection is just that, a prime connection. It's used to manually trigger the fuel pump.


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post #152 of 409 Old 04-06-2013, 12:02 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Also determined...believe it or not...with the wiring diagrams from Autozone that I don't need that sensor we were discussing that was plugged into the intake on the old manifold. Hell, I didn't need it on the old setup. Kind of funny thinking about that being connected....and the other end didn't even go to anything. Someone said it was from the EFE heater. They were right. I am going to unloom that part of the harness and remove that garbage. One less thing to clutter up the engine compartment. God knows how cluttered it is now with all those ECM wires.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
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I had to cut my nut in half .
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post #153 of 409 Old 04-06-2013, 12:30 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Quote:
Originally Posted by The_Raven View Post
Yes, the single grey wire (IIRC it's grey), runs the fuel pump.

The prime connection is just that, a prime connection. It's used to manually trigger the fuel pump.
Great. what does it connect to. It shows it terminating at the "fuel pump prime". Is this something separate? There is a wire present from it...but it's connected to the same one as the fuel pump....same color and all, so that doesn't make a lot of sense to me.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #154 of 409 Old 04-06-2013, 12:37 PM
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Re: Converting to EFI. Finally...A little help

It's just an open terminal.

It's used by connecting another wire to it and then to the battery, AKA manually priming.

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post #155 of 409 Old 04-06-2013, 12:58 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Quote:
Originally Posted by The_Raven View Post
It's just an open terminal.

It's used by connecting another wire to it and then to the battery, AKA manually priming.

Awesome...I was going to leave it disconnected anyway. May use it to get the pump primed initially. Thanks for your assist.

May even get this SOB started tonight.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #156 of 409 Old 04-07-2013, 02:25 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Hey guys, what all needs to be hooked up here? Not planning on connecting the air pump, but this TBI from the Astro only has a large port and a small port facting the rear. Realize the air pump would connect to another on the back, the EGR controller on one, so what does the other small one go to? The vents? What is the one on the front? I have a couple of tees if needed.


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Almost there. May get it running tonight. If not by Monday or Tuesday.


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Just got to connect the fuel pump, run the PCV, etc



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
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I had to cut my nut in half .
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post #157 of 409 Old 04-07-2013, 03:32 PM
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Re: Converting to EFI. Finally...A little help

Port C connects to the PCV valve and there is a t connection in that line that connects to the "purge signal" on the charcoal canister.

Port A connects to the purge hose on the canister to suck the gasses out.

Port J connects to the EGR solenoid.

Port F connects to the MAP sensor.

Any of those ports can be tapped with a t to run other vacuum operated things like the vacuum tank for the vent control.

Easy?

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post #158 of 409 Old 04-07-2013, 03:34 PM
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Re: Converting to EFI. Finally...A little help

And PLEASE PLEASE GET RID OF THOSE ZIP TIES you are using for hose clamps.

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post #159 of 409 Old 04-07-2013, 03:52 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Bill...relax. It isn't....it is just a bumper for the hose to ensure that the hose doesn't rub against the metal and starts spraying fuel. It is not a clamp...the line continues outside of the picture....deep breath...



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #160 of 409 Old 04-07-2013, 04:09 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

And what did this guy connect to?
And I mean the plastic vacuum sensor

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1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #161 of 409 Old 04-07-2013, 04:22 PM
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Re: Converting to EFI. Finally...A little help

That goes between the line for the egr vacuum.

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post #162 of 409 Old 04-07-2013, 05:23 PM
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Re: Converting to EFI. Finally...A little help

I snapped that sumbitch off when I got my new manifold. Someone decided to put a rock behind me and I tripped on it haha. looking good Jimmy hope you get it started soon

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post #163 of 409 Old 04-07-2013, 05:26 PM
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Re: Converting to EFI. Finally...A little help

Vacuum hose schematics here http://forum.ih8mud.com/40-55-series...matic-tbi.html
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post #164 of 409 Old 04-07-2013, 09:57 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Cool...Thank you guys....Good news and bad news here. When I first got everything together and attempted to start, it was blowing my ECM fuse that is conneced to orange wire....which would be ECM B fuse on a stock truck. However, it would light off if I sprayed some ether into the TBI. I blew about 4 fuses and then decided to check everything related to that orange wire. I noticed that the relay sounded like it had broken shit inside it, so I swapped it for the AC one that I am not using. Since an orange wire enters that relay it makes sense that if there was broken metal inside it could have been hitting ground or whatever....this was a junkyard harness...who knows. Maybe this is why the truck was junked...wouldn't start...f#ck it...take it to the junkyard. This ECM came from a different truck...

I swapped out the relay and it's not blowing the fuses now, but it still will not start. I checked the green/white wire to see if it had continuity from the ECM to the relay, and it does. There is no voltage present on the green/white wire when I turn the key on the fuel pump will not run. I know for a fact this relay is good because I jumped it out off the battery and from the orange wire and it runs. I am suspecting this is a bad ECM....any other theories?

Note that I was VERY thorough on this harness. I unravelled it from all the looms and checked for any burnt, broken or shorted wires and found none.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
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I had to cut my nut in half .
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post #165 of 409 Old 04-07-2013, 10:13 PM
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Re: Converting to EFI. Finally...A little help

is there 12v feeding the ECM?

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post #166 of 409 Old 04-07-2013, 10:17 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Yes...I checked all that stuff. The orange is hot at the ECM. I checked the orange wire at all points and there is 12v on it



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #167 of 409 Old 04-07-2013, 10:36 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Upon further inspection, my B1 wire appears to not be hot. Why the hell that is cannot imagine since they are all tied together in the harness.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #168 of 409 Old 04-07-2013, 11:32 PM
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Re: Converting to EFI. Finally...A little help

Well at least you found the issue

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post #169 of 409 Old 04-07-2013, 11:42 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Yeah...maybe. Lets hope the ECM is good. What do you know about those two 12v connections? I'm guessing that since the fuel pump is connected to that pigtail that has the fuel pump stuff in it that is why it isn't lighting up the fuel pump. It will attempt to start with ether in the TBI unit. So I am guessing...and I could be wrong that is why? The pigtail for C and D rows run the injectors and such...This is going on strictly Jimmykicker logic and may have no basis in fact whatsoever....



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #170 of 409 Old 04-07-2013, 11:55 PM
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Re: Converting to EFI. Finally...A little help

The ECM could be sitting on the bench and the engine will start and run with ether or fuel being sprayed into the TB. Spark is still enabled via the ICM, so add fuel and you have a running engine.

Do you have any way to connect to the ALDL connector? Plugging into that could help diagnose what's going on. If there is no communication, the ECM is likely not coming on, especially if the CEL is not lighting. If the CEL is lighting you can then use the code retrieval method to determine if there is anything else wrong, like a bad or missing PROM (code 51 IIRC).

If the ECM is not powering on (CEL not illuminating), then look at the power wires, including switched inputs and grounds to make sure everything is good and switching on and off at the correct times.

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post #171 of 409 Old 04-08-2013, 12:02 AM Thread Starter
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Re: Converting to EFI. Finally...A little help

I'm not getting any CEL light coming on. Should the CEL not light when the key is turned on for just basic test with the key just turned to ON? I did find the B1 connection isn't hot...Not sure why because all that shit is connnected together in the harness under the hood. So I'm guessing I'm just not getting 12v there to turn the ECM on? C16 is hot. I havent checked my ECM wires for ignition pink/black yet...Doing all that tomorrow. Just too worn out to do it tonight. Last time I worked on something too worn out I cooked the dash harness...not doing that again.

For that B1 connection I may strip back just a tiny bit of insulation, connect it to 12v and see if that bitch lights up.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #172 of 409 Old 04-08-2013, 12:31 AM
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Re: Converting to EFI. Finally...A little help

I seem to recall reading somewhere that the check engine light gets it's signal from the ecm through a ground signal, not a positive signal. So one wire to the light should be hot (positive) whenever the key is on.
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Re: Converting to EFI. Finally...A little help

Post #4 here explains the CEL wiring http://www.pirate4x4.com/forum/chevy...c-egr-tbi.html .
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post #174 of 409 Old 04-08-2013, 12:41 AM Thread Starter
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Re: Converting to EFI. Finally...A little help

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I seem to recall reading somewhere that the check engine light gets it's signal from the ecm through a ground signal, not a positive signal. So one wire to the light should be hot (positive) whenever the key is on.
Might do it, but I am obviously missing part of the circuit with B1 not being hot completing it.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #175 of 409 Old 04-08-2013, 12:43 PM
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Re: Converting to EFI. Finally...A little help

Man JK, I really hope this thing runs super for all of the BS you're going through...
Remember something else, you may need to 'tune' this for the best performance.

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post #176 of 409 Old 04-08-2013, 01:33 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Oh yeah...planning on that...I got the throttle body bored out and the larger TBI on it. I am hoping for at least the performance of the 4bbl. When I pulled my 4bbl off I noticed some raw fuel on top of the manifold base. I don't believe my carb was healthy, and it may never have been which may have been some of my issue. Honestly? I really wanted to see if I could do this...Never attempted anything like it and I wanted to learn more about EFI



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #177 of 409 Old 04-08-2013, 05:55 PM
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Re: Converting to EFI. Finally...A little help

Being from the junkyard, don't forget that there are 2? of those inline wire fuse (forgotten the name) thst are basically just wire that is made to break if it's overloaded (pia if you don't know what it is) The one behind my alternator was getting extremely hot after I put my 3.4 in, it was insane, I couldn't figure it out, the engine had good clean grounds from the battery to the frame, to the engine, to the core support, yet after I added additional grounds to the chassis and frame it worked fine

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post #178 of 409 Old 04-08-2013, 07:45 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Well, I'm going to check my ground and such that stupid relay burnt up my ECM. I found everything else in order. The one wire that I thought was supposed to be hot was actually an ALDL wire....not constant hot...not part of that circuit. Not B1. B1 was hot. That is why i. stopped last night. Was making mistakes. That relay is cooked and was shorting my hot to ground and god knows what else. Moral to the Story. Don't trust 25 year old relays...



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #179 of 409 Old 04-08-2013, 08:57 PM
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Re: Converting to EFI. Finally...A little help

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Man JK, I really hope this thing runs super for all of the BS you're going through...
Remember something else, you may need to 'tune' this for the best performance.
Yeah, he's going to have to have the base pulse width in the prom programming adjusted for the engine size, injectors and fuel pressure to start with.

This is a case where it sucks that we live across the country from each other as he's doing the same conversion I did less a couple minor differences.

1985 GMC S-15 Gypsy ext cab.
3.4l, Edelbrock intake, a 4.3l throttle body controlled by an '88 TBI ECM. 700R4 with 3.73 rear. Real time tuning using a CF-30 Toughbook with a Moates Ostrich 2 emulator.
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post #180 of 409 Old 04-09-2013, 12:32 AM Thread Starter
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Re: Converting to EFI. Finally...A little help

I pulled the harness back out of the truck. There are NO shorts anywhere. The harness is solid just like I thought it would be. Again my best guess is that m0therf*ck*n relay shorted out my ECM. It had a 20 amp fuse in the external box I had this mounted to...Factory is 10. Lights dimmed when I connected it....Took fuse about 3 seconds to pop...Probably destroyed the ECM before it popped....Great...I already had a painless wiring harness for the existing pump....My brain screamed at me to use this...and I wouldn't be going through this probably. If I had checked those damn relays I wouldn't be going through this right now either. I checked EVERYTHING but the relays....my damn luck. Who would have thought a relay would bring this much shit to my life....? This weekend I am going to go pull me a couple of ECMs and hook the harness up outside the truck before I start stuffing wires through there again. Think that is going to be smart so I can test easier should I have a no start condition. I don't think I will though. I know where all that stuff hooks up now, and I KNOW I have it done correctly.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #181 of 409 Old 04-09-2013, 08:08 AM Thread Starter
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Re: Converting to EFI. Finally...A little help

Oh yeah...and buying a new relay...Hmmm...think I am going to use my Painless after all. Why the hell not? I energize the wire with the ECM signal (green), connect the ground (black/white) and the constant hot (orange) and run the output to the pump (tan/white). Same deal. No worries. Should have done that in the first place....GRRR....



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #182 of 409 Old 04-10-2013, 12:25 AM Thread Starter
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Re: Converting to EFI. Finally...A little help

I'm going to chase down some ECMs on Friday. What other clunkers can I find an 8062 in?



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #183 of 409 Old 04-10-2013, 07:54 AM
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Re: Converting to EFI. Finally...A little help

1228062 applications:

1988-93 truck 2.8 V6 TBI “R” LL2
1988-91 truck 4.3 V6 TBI “Z” LB4 w/ AT (“S” & “T” body)
1989 truck 2.8 V6 TBI “R” LL2 (Isuzu)
1990-91 truck 2.8 V6 TBI “R” LL2 (Isuzu)

1227747 ecm applications:

1987-91 truck 4.3 V6 TBI “Z” LB4 (exc. “S” & “T” body)
1990 truck 4.3 V6 TBI “Z” LB4 w/ MT (“S” & “T” body)
1990-91 truck 4.3 V6 TBI “B” LU2
1987-91 truck 5.0 V8 TBI “H” L03
1987-90 truck 5.7 V8 TBI “K” L05
1991-92 truck 5.7 V8 TBI “K” L05 w/o 4L80E</I>
1987-89 truck 7.4 V8 TBI “N” L19

1985 GMC S-15 Gypsy ext cab.
3.4l, Edelbrock intake, a 4.3l throttle body controlled by an '88 TBI ECM. 700R4 with 3.73 rear. Real time tuning using a CF-30 Toughbook with a Moates Ostrich 2 emulator.
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Re: Converting to EFI. Finally...A little help

Thx Bill



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #185 of 409 Old 04-11-2013, 12:29 AM Thread Starter
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Re: Converting to EFI. Finally...A little help

Pulled two ECMs today. One was from an 87 and wasn't marked, so I am guessing that is the older one prior to the 8062. The truck had the infamous "cold start module" attached. I grabbed it for the shit of it and will post a pic. I also pulled an 8062 from a 91 S-10 today as well as the harness. Truck had been JUST set out there and was complete. The harness is kinda different. Has a couple of different things going on there...but the computer says 8062, so I am guessing I have no worries? Had some weird module piggybacked on it? Part of the anti lock brake system? Was installing the harness that I checked pin for pin earlier, my singer from my band called and was like...."where you at?"...whoops..I kinda got wrapped up and forgot band practice. Needless to say I didn't get it done because I had to haul ass there.. I'm going to do a temporary install on the harness with it on the outside of the truck and see if I can't get this bitch running tomorrow before I go snaking all that stuff back in.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #186 of 409 Old 04-11-2013, 12:53 AM
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Re: Converting to EFI. Finally...A little help

the small box attached to it was the DRAC, for the electronic speedo, cruise control, and ABS

USAF
'86 Grand National - LZ9 swap(in progress)
'97 Ram SS/T 360/.030 over.
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post #187 of 409 Old 04-11-2013, 10:33 AM
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Re: Converting to EFI. Finally...A little help

I am really interested to see how the TBI works compared to the Holley. The Eddy intake should have better velocity than the factory intake.
You may want to contact Craig Moates for the hardware/software to tune your ECM
http://www.moates.net/
The last item... finding a dyno so you can tune the rig.
I know there are a few guys who burn 'performance' chips for the ECUs and are available online, but these are a general tune for any vehicle. The best results are on a dyno with your truck reprogrammed.

Like I've said before, I have seen some of the turbo conversion Hondas come in and strapped to the shop dyno almost DOUBLE horsepower output with a good 'tune'. Very impressive.

34Blaze - did you see an improvement going to TBI?

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Re: Converting to EFI. Finally...A little help

Ive never owned a carby dime, but ive driven a couple of them. The carb'd trucks were dogs compared to any TBI 2.8 ive had. the larger 4.3/5.9/5.7 TBI was a noticable improvment. im going to be converting to MPFI later on this year to accomodate the GT35, also a 7730 swap.

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'97 Ram SS/T 360/.030 over.
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Re: Converting to EFI. Finally...A little help

Ok guys....I am about to freaking scream. I got two new ECMs (well junkyard ones) and I hooked everything back up. I am getting the pump to energize when I turn the key on, and it is pumping while cranking. However, the truck will not start. The injectors aren't firing at all. No activity from them. SES light now comes on when turning on the key....so getting somewhere. Still no start. Guess I need to see if I can pull some codes.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #190 of 409 Old 04-11-2013, 04:21 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Nothing but code 12 for diagnostic mode. At least ECM is alive. I connected the ECM I had before to see if it was my wiring. Nope definitely bad. No CEL. Dead. Both of these turn on the pump.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #191 of 409 Old 04-11-2013, 05:05 PM
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Re: Converting to EFI. Finally...A little help

is there spark?

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'86 Grand National - LZ9 swap(in progress)
'97 Ram SS/T 360/.030 over.
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post #192 of 409 Old 04-11-2013, 05:27 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Yes, the truck will start if you spray ether into the throttle body. ALL systems go....except for the injectors firing...



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #193 of 409 Old 04-11-2013, 05:32 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

I checked the injector wires. 12 v switched on white and red wires. This is kinda blowing my mind...



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #194 of 409 Old 04-11-2013, 06:06 PM
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Re: Converting to EFI. Finally...A little help

Do you have an ALDL cable?

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post #195 of 409 Old 04-11-2013, 06:12 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Quote:
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Do you have an ALDL cable?
Yes. I have already checked for codes. Code 12 is all that it is reporting. CEL glowing on the dashboard like it should be. Fuel pump energizing. Engine firing. Just no injectors firing.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #196 of 409 Old 04-11-2013, 06:12 PM
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Re: Converting to EFI. Finally...A little help

was the engine harness modified or plug n play?

12V power at pins:

A6
B1
C16

http://www.gearhead-efi.com/Fuel-Inj...Information-4E

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'86 Grand National - LZ9 swap(in progress)
'97 Ram SS/T 360/.030 over.
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post #197 of 409 Old 04-11-2013, 06:26 PM
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Re: Converting to EFI. Finally...A little help

Are you using the ebay injectors?

1985 GMC S-15 Gypsy ext cab.
3.4l, Edelbrock intake, a 4.3l throttle body controlled by an '88 TBI ECM. 700R4 with 3.73 rear. Real time tuning using a CF-30 Toughbook with a Moates Ostrich 2 emulator.
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post #198 of 409 Old 04-11-2013, 06:26 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Yeah...modified. I cut out everything not related to the ECM. The only things I don't have connected that connect to the ECM are the TCC on pin A7 since I am going to just let the mechanical existing controls run the lockup... A/C control on pin A2, A/C return for pin B8. I am going to connect them to my existing system once I get the engine running. There is a tan/black wire hanging off the ALDL connector that isn't connected either. I apparently goes to the TCC kill. I don't believe anything I have disconnected would keep the engine from running.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #199 of 409 Old 04-11-2013, 06:28 PM Thread Starter
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Re: Converting to EFI. Finally...A little help

Yes, using the ebay injectors. I suppose I could try the 2.8 ones. My patience is wearing thin with this mother. What about the park neutral switch? I can't see how this would have anything to do with injectors not firing, but it does have a connection on the ECM. It is connected properly too...just wondering if that switch is out of adjustment would it keep the injectors from firing?



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Flowmaster, shift kit, e-fan.
The S-5 trailer-Half a 1st Gen LWB S-10


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #200 of 409 Old 04-11-2013, 06:30 PM
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Re: Converting to EFI. Finally...A little help

rig up a noid light just in case the injectors arent responding to ECM signal.


did you verify power on A6, B1, C16?

only other thing I can figure is no DRP reaching the ECM so it doesnt know when to fire the injectors.

USAF
'86 Grand National - LZ9 swap(in progress)
'97 Ram SS/T 360/.030 over.
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