I have an 89 Dodge Shadow Automatic. Two weeks ago it was idling high. It would rev at ignition, stop lights, in park, etc. I took it to a mechanic, replaced the Idle Air Control and a PCV valve. Now the car stalls when in a low gear... stop lights, parking lots, etc. They tell me that it is a brand new problem with the spark plugs, MAP sensor, wiring harness, etc. They replaced my spark plugs and MAP sensor and it still stalls. Could the problem still be the IAC, could it idle too low now and stall?
On modern day cars the parts that get fitted need to be adapted to the ECM using a decent diagnostic machine. I bet that this was not done and the car is now suffering as a result.
Something to try is resetting the ECU, simply disconnect battery for 10 minutes, reconnect, then start car from cold *without touching gas pedal* and leave idling until the rad fan comes on (this resets all the base idle settings) then take it for a drive - hopefully will solve the problem
Car Stalls and idles low
http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html
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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
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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
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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
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These
details will help.
Thanks.
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Usually answered in minutes!
replaced the cat, map, idle air control, upstream o2 sensor, nox is at 1407 at 25 mph max is 770.
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