Question about Chrysler Concorde

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97 Chrysler Concorde high idle speed A 1997 Chrysler Concorde starts fine, but idles at 2000 rpm. The idle increases to 2500 as it warms up. Vacuum is at spec, and no signs of intake leak. We have replaced the coolant temp sensor (previous code), idle air control motor (previous code), one front O2 sensor, EGR valve and control, and MAP sensor (previous code). The previous owner had the PCM replaced with a used unit, with no luck. We have not yet replaced the intake air temp sensor, or the throttle position sensor (bench check shows it to be good). It is currently showing no MIL codes except 12 (battery disconnect). We will be checking wiring between PCM and IAC for shorts, and try to get a check of the PCM using a code reader. Any other ideas?

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  • phil4563 Jun 22, 2009

    Thanks for your help! Both throttle bodies now sparkle (both operated normally-varnish only), and idle setting was checked on the right side. The PVC valve was changed previously. I plugged out the evaporative emission system, with no change. The idle speeds up when I unplug the purge hoses on each throttle body. I have not yet checked the wires to the IAC. I am wondering whether the PCM was programmed correctly when the previous owner had it replaced with a used unit. What is the requirement? In fact, I will check to be sure it is the correct PCM for the car. I'm starting to grasp at straws. What next?

  • phil4563 Jun 25, 2009

    As I mentioned in my first message, I replaced the IAC valve. Since then, I have replaced the PCM with a reconditioned unit, and replaced the right side upstream

  • phil4563 Jun 25, 2009

    As I mentioned in my first message, I replaced the IAC valve with a new one. After that, I replaced the PCM with a reconditioned unit, and exchanged the O2 right side upstream sensor with the one I replaced on the left side. I plugged out the vapor collection system as a test, and there was no change. The only thing I have not yet changed is the air charge temp sensor. I will recheck the TPS, but have no confidence I will find anything. What about the speed sensor circuit? Still no MIL codes showing. I appreciate the help so far.

  • phil4563 Jun 30, 2009

    Thanks for your help. My next (final) steps are to check the rear O2 sensors and the air intake temp sensor. After that I will pull off the intake manifold and "ensure" there are no leaks. Having gone that far, I may as well replace the valve cover gaskets, etc. Thanks again.

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Couple things to check out. what is the throttle position sensor readings fully closed (should be .5volts). if it's above the pcm may think the car is not at idle. did you spray sections of vacuum lines and manifold gaskets with brake clean to check for leaks? (when you hit a leak the rpm will increase). do you have a scanner? what are to fuel trims? (short term fuel trim and long term fuel trim). are there any engine codes remaining? did you try to disconnect the battery for 15 minutes, reconnect and have the pcm relearn since all the parts were changed?

Posted on Jun 26, 2009

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It definitely sounds like you are having problems with your IAC valve. I would check the wires but I would bet that you probably just need to replace your IAC valve (however you can try to clean it but it doesn't cost much to replace, you can try cleaning just to see if it helps and then replace it). I would be very surprised if that doesn't fix it for you. Let me know if you have any other questions. Thanks for using FixYa!

Posted on Jun 23, 2009

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Hi,

What i have usually found Vaccuum Leak to be the main reason. However, as you have already checked the same, there is no point discussing that. Now,

Clean the throttle plate (both sides), the throttle body throat, and the idle air intake hole, and check the throttle linkage. Make sure the throttle closes all the way without binding.
Then check the brake booster vacuum hose and any other vacuum hoses you can locate: use the underhood sticker as a roadmap to trace all the hoses out. Check the pcv valve for function. The 'fuel purge' has to do with the evaporative emission system hoses, which are shown on the underhood sticker. That is a subset of the general issue of vacuum leak.Then check the idle air control motor connector and harness.
clean the throttle plate (both sides), the throttle body throat, and the idle air intake hole, and check the throttle linkage. Make sure the throttle closes all the way without binding.
Then check the brake booster vacuum hose and any other vacuum hoses you can locate: use the underhood sticker as a roadmap to trace all the hoses out. Check the pcv valve for function. The 'fuel purge' has to do with the evaporative emission system hoses, which are shown on the underhood sticker. That is a subset of the general issue of vacuum leak.

.
Any further help, let me know.

Thanks for using "Fixya'.

Posted on Jun 19, 2009

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