Technical Car Experts Answers everything you need: Bad miss at idle

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Tuesday, January 22, 2013

Chrysler Sebring Touring: 2007 4dr Sebring 2.4 engine dies at idle

Chrysler Sebring 2.4 engine dies at idle

Engine dies at idle intermittently while at stop light or when engine gets warm

Question:

There is no check engine light, still scanned the engine module with no error code stored,the vehicle starts and runs fine with no problems but suddenly dies at idle without any indication.

Is it faulty PCM or any other know issue causing these problem?

Please Help !!!!!!!!1

Answer by expert:-

Thanks for asking your question here.

There are a few things I will mention below to troubleshoot these issue noticed on your vehicle:-----

Primary will be software. We have seen a good number of software changes to the PCM, often with a TSB but just as often there are updates released with no TSB's or certification. The first thing to start is make sure the PCM software is up to date.If not then get the PCM software updated from nearest Chrysler dealer.

Other then this i suggest you to get the crank sensor connector checked and inspected. If the connector seems faulty then i suggest to replace the crank sensor connector. Why i am suggesting to inspect and replace crank sensor because at our auto repair garage we have seen many such connector getting faulty causing same types of problem. And as per your vehicle model mentioned these early World engines had problems with terminal grip at the crank sensor connector and it will cause driveability issues and sometimes crank sensor codes to set. Replacement of the connector may take care of the issue.

But if the crank sensor looks fine then other thing to be checked is burning of the fuel pump connector. A poor connection in between the pump connector and pump will result in the connector getting melt, which definitely will aggravate the poor connection. I've come across this cause intermittent driveability problems exactly like you are having, and won't set a code in the PCM since it's not monitored or controlled by the PCM. Replacement of the pump and connector together is usually necessary to repair this. The pump has an access panel under the left rear seat and you could check this fairly quickly.

As per my vehicle repair experience its not the PCM locking up. If the PCM was locking up somehow then it wouldn't restart the way it does. Usually when a module locks up it needs a power cycle (battery disconnect) to unlock, if it does unlock. If it's starting right back up I wouldn't suspect a PCM issue.And in your case the vehicle dies at idle but it will again restart normally and run.So PCM getting lock up is not possible.

These details will help.

Thanks.

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Friday, November 30, 2012

IAC is controlled by the PCM (Powertrain Control Module)

IDLE ROUGH ISSUES

Idle air control valve wiring diagram

Ford expedition IAC to PCM wiring diagram :----

Ford IAC wiring

These will help.
Thanks.

IDLE ROUGH ISSUES

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:------

Bad miss at idle?

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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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

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

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

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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GMC Sonoma Stalls and idles low

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

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GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

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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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

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High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

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Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

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Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Thursday, January 26, 2012

Bad miss at idle?

The problem noticed on ford vehicle.

First, you need to check for vacuum leaks.If you have a collapsed or broken vacuum hose, this can seriously interfere with the performance of the engine.

If this is not the case, then most likely you have an ignition coil or two bad on the vehicle. If the miss is bad enough to cause it to stall, then likely you're going to have a check engine, or service engine light on and codes stored in the computer.

You can get the computer scanned. If there are no codes then you'll need to have it connected to a ford scanner tool, which will be able to run tests to determine which cylinder(s) are affected.

Another possibility is the idle control valve. This won't necessarily cause any misfires, but it can cause it to die on you when in drive... it's possible you have multiple problems going on.

There's also the possibilities of low fuel pressure, low compression, a blown head gasket.. or a number of other things as well, which is another reason it is critical to get the codes scanned on this.

You can usually get it scanned for free at a retail parts store, such as Autozone or Advance.

Try this procedure mentioned below :----

Start the vehicle up and let it idle, then unplug the electrical connector for one of the coils, and if you notice a difference in idle, then likely that cylinder is good. Turn off the engine, plug it back in, start it up, and unplug the next one (do not plug the coil connector back in with the engine running, as the voltage spike can damage the coil). Once you find one that when unplugged doesn't change anything, then you've got a problem in that cylinder which could be a bad coil, bad coil boot, bad spark plug, low compression, or a bad fuel injector.

This will help.Thanks.

See below related help solutions :----