Question about 1990 Dodge Caravan

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Idled high, replace IAC and PCV, now idles low and stalls

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?

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  • Anonymous Apr 01, 2014

    replaced the cat, map, idle air control, upstream o2 sensor, nox is at 1407 at 25 mph max is 770.

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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

Posted on Nov 18, 2009

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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:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

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http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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1999 Ford F-150 Idles rough and quits when gas pedal is pressed less?

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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http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

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Thanks.

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images-trsfwikau0d5dnlwn4zno1ix-3-0.jpg

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