1999 S10 Blazer 2WD 4.3L V6. Car starts hard then idles rough. Some black smoke from exhaust. At speed the car runs fine though it may run rough at a traffic light. The air filter is clean. I removed the air induction tube from the throttle body to get a look inside. I opened the throttle plate and noticed that it was wet on the back side. To my way of thinking this indicates an abundance of fuel at low engine speed. I don't know how this fuel injection system works other than it is the throttle-body type. Any suggestions besides shoving it off a cliff, which would be difficult here as it's quite flat?
It can be issue
with IAC( idle air control valve) causing the problem.
There
are many other possibilities causing these idle issues. Engine idles rough.
There
are few help links with solutions to troubleshoot such idle issues.
I
suggest you refer the link below and follow
its troubleshooting details:------
Click
the link below:-----
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http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html
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http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html
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http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html
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http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html
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Cold start problem and vehicle shudder around 2500 to
3500 rpms
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http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
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http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html
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http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html
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http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html
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http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html
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http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
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High
Idle Problem
http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html
-------
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
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http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
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http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
-------
http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html
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http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
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http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------
These
details will help.
Thanks.
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really rough idle at idle then when i rev it up it seems to go away for the most part i thought it might be the cap and rotor so i changed that along with plugs and wires ,,still the idle prob is there .........? these probs can cost a barrel of cash if i let them so any help would be a welcome sight !!!!!!!!
CHECK FOR ANY DIAGNOSTIC CODES. WRITE BACK it sound like your having the open loop mode operation in your engine, it could be a coolant temperature sensor.
check fo codes and also inspect e.g.r. valve stock open with carbon deposits replce valve or cleaned
drawing to much vacume through throttle body. running very rough. dies if I take off air box.
i suspect the problem is fuel related. i cleaned the throttle body, but prblem presist.
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