OK, not really, now I have no idle - S-10 Forum
 
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post #1 of 19 Old 06-16-2015, 04:14 PM Thread Starter
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OK, not really, now I have no idle

It was running rough so I put new wires in, dz cap, rotor, pcv, fuel and air filter. Plugs weren't that old so I left them. Looks like all the vacumn hoses are connected. It will not maintain an idle speed. Any suggestions? I checked that all plug wires were connected correctly on the plugs and dz cap. Thanks



1985 S-10 2.8ltr. Radio delete, 2WD positraction, gauges, halogen lights and off-road tire option (standard tread front, off-terrain tire rear - now running 4 Winterforce tires). Delco gas shocks. Dad was original owner. 95K miles now. Single stage urethene repaint was the summer of 2011 project (now faded, don't buy Eastwood's paint).
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post #2 of 19 Old 06-16-2015, 06:10 PM
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Re: OK, not really, now I have no idle

I wouldn't know where to tell you to start on that 2se with all that attached to it..

Sorry.

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 #3 of 19 Old 06-16-2015, 06:23 PM Thread Starter
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Re: OK, not really, now I have no idle

Come on! Ya gunna let 300 feet of tubing scare ya?

1985 S-10 2.8ltr. Radio delete, 2WD positraction, gauges, halogen lights and off-road tire option (standard tread front, off-terrain tire rear - now running 4 Winterforce tires). Delco gas shocks. Dad was original owner. 95K miles now. Single stage urethene repaint was the summer of 2011 project (now faded, don't buy Eastwood's paint).
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post #4 of 19 Old 06-16-2015, 06:32 PM
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Re: OK, not really, now I have no idle

Yes......yes I am......

LOL...that is what my truck started out with. What a pain in the ass.....

Oh, I have some spare parts for the 2se. I don't remember what exactly, but I no longer need them.

I'll let you know what they are when I find them if you are interested.

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 #5 of 19 Old 06-16-2015, 06:38 PM
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Re: OK, not really, now I have no idle

I found the box, a couple of electric choke elements and 3 brand new choke pull off's.

Sorry, thought I had more parts than that.

When was the last time that carb was rebuilt?

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 #6 of 19 Old 06-16-2015, 08:23 PM
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Re: OK, not really, now I have no idle

Check the timing? If so then I would start looking for vacuum leaks. If you haven't replaced ALL of the vacuum tubing, do so. One piece at a time. It will take a little time, but it will also make a huge difference on the running. Turn up the idle speed a little if you need on the carb. If you have done the tubing and tune up, and it still runs rough, then I would check further. How many miles on the motor?

85 S10 Durango 2.8L extcab rwd 36k actual miles.
"true wisdom is knowing you know nothing" Paraphrased from Socrates
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post #7 of 19 Old 06-16-2015, 08:31 PM
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Re: OK, not really, now I have no idle

When I had the 2se carb on my engine, it gave me fits because charcoal from the canister got sucked up into it. Had to replace the canister as the mesh filter in it had disintegrated, thus allowing the carb to suck up some charcoal.

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 #8 of 19 Old 06-16-2015, 08:45 PM Thread Starter
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Re: OK, not really, now I have no idle

Quote:
Originally Posted by damanx View Post
I found the box, a couple of electric choke elements and 3 brand new choke pull off's.

Sorry, thought I had more parts than that.

When was the last time that carb was rebuilt?
I did the carb in Jan 2004 at 82k miles. I put a new float in along with a secondary pull off. It now has 95k

1985 S-10 2.8ltr. Radio delete, 2WD positraction, gauges, halogen lights and off-road tire option (standard tread front, off-terrain tire rear - now running 4 Winterforce tires). Delco gas shocks. Dad was original owner. 95K miles now. Single stage urethene repaint was the summer of 2011 project (now faded, don't buy Eastwood's paint).
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post #9 of 19 Old 06-16-2015, 08:51 PM Thread Starter
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Re: OK, not really, now I have no idle

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Check the timing? If so then I would start looking for vacuum leaks. If you haven't replaced ALL of the vacuum tubing, do so. One piece at a time. It will take a little time, but it will also make a huge difference on the running. Turn up the idle speed a little if you need on the carb. If you have done the tubing and tune up, and it still runs rough, then I would check further. How many miles on the motor?
I'll check the timing tomorrow. Motor has 95k. I was under the impression there is no curb idle adjustment. Are you saying there is one. I know there is a fast idle adjustment.

1985 S-10 2.8ltr. Radio delete, 2WD positraction, gauges, halogen lights and off-road tire option (standard tread front, off-terrain tire rear - now running 4 Winterforce tires). Delco gas shocks. Dad was original owner. 95K miles now. Single stage urethene repaint was the summer of 2011 project (now faded, don't buy Eastwood's paint).
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post #10 of 19 Old 06-16-2015, 08:53 PM Thread Starter
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Re: OK, not really, now I have no idle

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Originally Posted by damanx View Post
When I had the 2se carb on my engine, it gave me fits because charcoal from the canister got sucked up into it. Had to replace the canister as the mesh filter in it had disintegrated, thus allowing the carb to suck up some charcoal.
Will check tomorrow. Thanks.

1985 S-10 2.8ltr. Radio delete, 2WD positraction, gauges, halogen lights and off-road tire option (standard tread front, off-terrain tire rear - now running 4 Winterforce tires). Delco gas shocks. Dad was original owner. 95K miles now. Single stage urethene repaint was the summer of 2011 project (now faded, don't buy Eastwood's paint).
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post #11 of 19 Old 06-17-2015, 09:09 AM
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Re: OK, not really, now I have no idle

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I'll check the timing tomorrow. Motor has 95k. I was under the impression there is no curb idle adjustment. Are you saying there is one. I know there is a fast idle adjustment.
I am not well versed in the q-jet 2bbl on these, other than I hate them. I ASSUMED there was one. And if so then a slight adjustment might help. I know there is no idle fuel mixture adjustment(at least with out removing the plug).

I have an 85 with the 2.8l To me it sounds like vacuum problems. Do you have emissions tests that you need to worry about where you live? If not I would look seriously at removing the "E" stuff if possible.

85 S10 Durango 2.8L extcab rwd 36k actual miles.
"true wisdom is knowing you know nothing" Paraphrased from Socrates
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post #12 of 19 Old 06-17-2015, 11:08 AM
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Re: OK, not really, now I have no idle

Took me a while to find it, but I had to buy the service manual for the Varajet 2SE carburetor.

I think it was 15 bucks or something like that.

It's 16meg and I can't attach it, but send me a pm with your e-mail addy and I'll email it too you in two parts later.

Never mind that, here you go: (mine has 27 pages, this one has 25, I don't know what to pages are missing)

http://c777913.r13.cf2.rackcdn.com/v...ice_manual.pdf

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 #13 of 19 Old 06-17-2015, 05:52 PM Thread Starter
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Re: OK, not really, now I have no idle

Thanks. I have one that I printed out 5-6 yrs. ago. Guess I should read about idle adjustments.

1985 S-10 2.8ltr. Radio delete, 2WD positraction, gauges, halogen lights and off-road tire option (standard tread front, off-terrain tire rear - now running 4 Winterforce tires). Delco gas shocks. Dad was original owner. 95K miles now. Single stage urethene repaint was the summer of 2011 project (now faded, don't buy Eastwood's paint).
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post #14 of 19 Old 06-24-2015, 12:58 PM Thread Starter
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Re: OK, not really, now I have no idle

It now runs great.
I replaced 6' of vacumn hoses - not all, I ran out of hose and have to get more. The carb adjusting screw was way in too much, only 1 turn from all in. I think when they did emissions here the garage cranked it in so it would pass. Now I have it 5 turns out. Timing was a bit retarded. I have it now 13-14 degrees BTDC in park - it says to adust in DRIVE but I'm one person and that is difficult. I messed with the auto choke and fast idle cam screw. I replaced my new Autolite "Professional Series " 7mm coil wire with a new Jegs 8mm wire that I had. That's it.

1985 S-10 2.8ltr. Radio delete, 2WD positraction, gauges, halogen lights and off-road tire option (standard tread front, off-terrain tire rear - now running 4 Winterforce tires). Delco gas shocks. Dad was original owner. 95K miles now. Single stage urethene repaint was the summer of 2011 project (now faded, don't buy Eastwood's paint).
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post #15 of 19 Old 06-24-2015, 02:42 PM
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Re: OK, not really, now I have no idle

Most of the time (if you have not removed the carb or changed anything else) the idle mixture - as you found out - is the problem. Backing out the mix screw at the base of the carb usually cures the issue. (unless you have a vacuum leak)
These carbs have a plug (from the factory) over the screw to keep anyone from changing the idle mixture. At least yours was removed by someone.

Always good to hear a success story.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #16 of 19 Old 06-24-2015, 03:01 PM Thread Starter
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Re: OK, not really, now I have no idle

...

1985 S-10 2.8ltr. Radio delete, 2WD positraction, gauges, halogen lights and off-road tire option (standard tread front, off-terrain tire rear - now running 4 Winterforce tires). Delco gas shocks. Dad was original owner. 95K miles now. Single stage urethene repaint was the summer of 2011 project (now faded, don't buy Eastwood's paint).
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post #17 of 19 Old 06-24-2015, 03:02 PM Thread Starter
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Re: OK, not really, now I have no idle

I rebuilt the carb 11 yrs ago and drilled out the plug

1985 S-10 2.8ltr. Radio delete, 2WD positraction, gauges, halogen lights and off-road tire option (standard tread front, off-terrain tire rear - now running 4 Winterforce tires). Delco gas shocks. Dad was original owner. 95K miles now. Single stage urethene repaint was the summer of 2011 project (now faded, don't buy Eastwood's paint).
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post #18 of 19 Old 06-24-2015, 09:52 PM
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Re: OK, not really, now I have no idle

^^^ Bonus.

Long time owner!

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #19 of 19 Old 06-26-2015, 08:55 AM
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Re: OK, not really, now I have no idle

I've had mine 18 years!



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/
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I had to cut my nut in half .
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