Question about Chrysler Concorde

3 Answers

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?

Posted by on

  • 2 more comments 
  • 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.

×

Ad

3 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 115 Answers

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

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 410 Answers

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

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 10,515 Answers

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

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

97 Chrysler Town and Country will not start in cold weather


If the fuel pressure is normal, it could be a sticking idle air control valve.

Jan 24, 2014 | Chrysler Cars & Trucks

1 Answer

Engine runs in idle +/- 2500 rpm


Without checking your car physically, its not possible to give you any idea what it could be or not

Dec 10, 2017 | 1999 Peugeot 206

1 Answer

Misfire, idles high


I would start with ect. That is the engine coolant temperature (sensor). That sensor monitors the coolant temp and tells the computer to increase engine RPM so the engine warms up faster. In the mornings when you first start your car and it idols high, that sensor is sending that information. If you have a code for this sensor start there.

Dec 10, 2017 | 1997 Chevrolet Cavalier

1 Answer

2000 grand cherokee limited, when I start it up it idle's very high about 2300 rpm and then gradualy work its way down, but it never settle to a stedy idle, even if the car is warmed up. If you gi


your throttle body sensor may be bad. first get a can of spray carb or fuel injection cleaner and spray it in the opening for the intake for the throttle body. this will clear out the carbon build-up. when you crank it it will run shaky but shoiuld clear up within a minute

Jan 03, 2012 | 2002 Jeep Grand Cherokee

1 Answer

1997 Crown Vic. Will crank, but will not idle.Have to keep foot on gas.


have a 97 crown vic,
in warm weather it idles fine and run fine
now that its cold I have to hold at high idle to have warm up
for about 10 mins.
if I just start it the engine will die with out me holding on foot on the gas

Feb 18, 2011 | 1997 Ford Crown Victoria

1 Answer

My 1997 Chrysler Concord idles at 2500 to 3000 rpm when first started and when it warms a little it idles at 2000 rpm and stays there. When I start it right after I turn it off, it starts at 2500 rpm then...


Maybe a short to the TPS or something shorting it out. There's also the IAC that really controls the idle but usually it will cause the RPM's to go up and down a little erratic if bad. The MAF sensor can cause major problems as well but since you already swapped the TPS and it helped and then stopped I would focus on that sensor and especially it's wiring to and from the ECM. Be careful with the sensor signal wire to the ECM can blow it if more than 5v passes or spikes.

Sep 03, 2010 | 1997 Chrysler Concorde

1 Answer

97 chrysler concorde high idle around 2k in park


if anything is the out of position the least bit there would be a code thrown and you would have had a check or service engine light come on. not knowing if you have checked that or not,there could be several things it could be. without knowing all things you have done I dont want to start throwing things out at you to replace. that could get expensive.

Jun 19, 2009 | 1997 Chrysler Concorde

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

895 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chrysler Experts

Marvin
Marvin

Level 3 Expert

81400 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

chargerhp
chargerhp

Level 3 Expert

814 Answers

Are you a Chrysler Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...