engine fire, no spark or fuel need help - S-10 Forum
 
LinkBack Thread Tools
post #1 of 7 Old 07-15-2015, 04:56 PM Thread Starter
Registered Users
 
Join Date: Jul 2015
Age: 25
Posts: 4

User is: forzanoob is offline
engine fire, no spark or fuel need help

Okay so im new to the s10 and domestic world (I love imports). I just bought a 93 Sonoma that had a engine fire a couple years ago when the previous owners poured gas into the intake to get it to fire. The wires going to the injectors, ignition coil/dizzy, and couple other wires and vacuum lines got burned up. So when I bought it they were taped back up. I tried to get it to fire with starter fluid and nothing. I checked for spark and got nothing. injectors don't fire. I soldered all the wires I could get to without taking anything a part.

so heres the questions:
could the fire have over heated the wires and possibly fried the ecu(I have heard of it happening before)?
does anyone have any advice for me on where to start?
finally, does anyone have a wiring diagram for the engine bay? I want to look over all of the wiring.

sorry for the kinda long post. thanks in advance for an help.

forzanoob is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 07-15-2015, 06:55 PM
B4U Task Force
 
Rhotpursuit's Avatar
 
Join Date: Sep 2003
Location: Spanaway, Wa
Posts: 19,782

User is: Rhotpursuit is offline
Re: engine fire, no spark or fuel need help

Fire damage is a hard thing to repair. I'd look for a new harness. You'll be chasing gremlins forever.

U.S.C.G. "Making sure the Navy doesn't get lost since 1790"

Apple Red 96 SS
Rhotpursuit is offline  
post #3 of 7 Old 07-16-2015, 08:42 AM
Awww..you ain't got shit!
 
jimmykicker's Avatar
 
Join Date: Nov 2005
Location: McCalla, Alabama
Age: 48
Posts: 3,246

User is: jimmykicker is offline
Re: engine fire, no spark or fuel need help

Here's the million dollar question...Obviously if the prior owner burned it pouring gas in it, obviously there was an issue already that probably had nothing to do with the fire. So what was up with it when they set fire to it?

Depending on the severity of the fire, the harness can likely be repaired. I don't think it's an issue or you will be haunted by gremlins as long as you repair it properly and since you said you soldered the wires you know what you're doing. But you don't know 100% if it's repairable unless you really get your hands on it to make sure. Here's what I'd do. Take the entire harness loose from the engine. It's not that hard. Take you about 30 minutes. There's one ground as I recall that's a bitch, but not impossible on the back of the passenger side head?? Don't pull it through the firewall unless it's burned there. That's a waste of time. Pull the ECM harness end out under the dash....Let the engine end lay on the passenger fender. Get a meter and extend the wires so you and a friend can check each wire for proper continuity. A paper clip works great for the pins on the ecm end. It's a pain but worth doing for piece of mind. Get deathphoenix99's wiring diagram (in his sig) for your year and double check everything. This eliminates the harness issue. Fix it right.

Does the check engine light illuminate when you turn the key on? If it does the ECM is alive and sending signal to the light. If it isn't, the ECM could be bad, but honestly this doesn't occur too often but I cooked one myself when I converted my carbed truck to EFI because of a shorted out fuel pump relay. So yeah, it can happen but not likely. Still if it is cooked I wouldn't hook another one up till I made sure that harness is right.

Just FYI, the distributor tells the injectors to fire, so I'd look there while I was at it since you said it was burned. Check the EFI sticky. Might be some stuff in there that would help you.

The good news here is that there isn't really a whole lot to this type of EFI. Once you REALLY understand it, there's only a few reasons it won't run and they are pretty easy to track down.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


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 .
jimmykicker is offline  
 
post #4 of 7 Old 07-22-2015, 04:09 PM Thread Starter
Registered Users
 
Join Date: Jul 2015
Age: 25
Posts: 4

User is: forzanoob is offline
Quote:
Originally Posted by jimmykicker View Post
Here's the million dollar question...Obviously if the prior owner burned it pouring gas in it, obviously there was an issue already that probably had nothing to do with the fire. So what was up with it when they set fire to it?

Depending on the severity of the fire, the harness can likely be repaired. I don't think it's an issue or you will be haunted by gremlins as long as you repair it properly and since you said you soldered the wires you know what you're doing. But you don't know 100% if it's repairable unless you really get your hands on it to make sure. Here's what I'd do. Take the entire harness loose from the engine. It's not that hard. Take you about 30 minutes. There's one ground as I recall that's a bitch, but not impossible on the back of the passenger side head?? Don't pull it through the firewall unless it's burned there. That's a waste of time. Pull the ECM harness end out under the dash....Let the engine end lay on the passenger fender. Get a meter and extend the wires so you and a friend can check each wire for proper continuity. A paper clip works great for the pins on the ecm end. It's a pain but worth doing for piece of mind. Get deathphoenix99's wiring diagram (in his sig) for your year and double check everything. This eliminates the harness issue. Fix it right.

Does the check engine light illuminate when you turn the key on? If it does the ECM is alive and sending signal to the light. If it isn't, the ECM could be bad, but honestly this doesn't occur too often but I cooked one myself when I converted my carbed truck to EFI because of a shorted out fuel pump relay. So yeah, it can happen but not likely. Still if it is cooked I wouldn't hook another one up till I made sure that harness is right.

Just FYI, the distributor tells the injectors to fire, so I'd look there while I was at it since you said it was burned. Check the EFI sticky. Might be some stuff in there that would help you.

The good news here is that there isn't really a whole lot to this type of EFI. Once you REALLY understand it, there's only a few reasons it won't run and they are pretty easy to track down.
When you say it could be bad, would it still have power?
forzanoob is offline  
post #5 of 7 Old 07-22-2015, 08:40 PM Thread Starter
Registered Users
 
Join Date: Jul 2015
Age: 25
Posts: 4

User is: forzanoob is offline
Re: engine fire, no spark or fuel need help

idk if anyone will see this but if the dizzy gear was broken would I be able to turn it without effort?
forzanoob is offline  
post #6 of 7 Old 07-22-2015, 09:06 PM
Registered User
 
Join Date: Dec 2005
Location: Liberal,Ks
Age: 69
Posts: 376

User is: bonestock is offline
Re: engine fire, no spark or fuel need help

Do you mean turn the rotor in the distributor? Is then yes if gear broken, the dist. shaft would turn easily.

Bonestock
bonestock is offline  
post #7 of 7 Old 07-23-2015, 08:09 PM
Awww..you ain't got shit!
 
jimmykicker's Avatar
 
Join Date: Nov 2005
Location: McCalla, Alabama
Age: 48
Posts: 3,246

User is: jimmykicker is offline
Re: engine fire, no spark or fuel need help

Sorry I didn't respond. Still did not understand what you were asking anyway. Um, if the you can spin the rotor under the cap without effort the shaft pin is probably sheared. Why this would happen? I don't know, but this is certainly your problem if it can be turned freely. That would certainly explain the lack of spark and fuel since there would be no pulse to fire the injectors and no spark since the distributor won't spin.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


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 .
jimmykicker is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the S-10 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome