Question about 1991 Cadillac DeVille

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Rough idle when starting vehicle, it acts like it wants to stall after a few minutes at idle. It spits and shutters, then it revs itself up and runs great. This happens every time it is restarted. If I drive it before it goes thru this process it will try to stall and losses power on road for a few seconds before it revs itself up and runs normal. Have tried additives for carbon build up and have changed the TPS, no fix.

Posted by tammy kimbrell on

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Ron C Pylkki

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You hsve a vacum leak

Posted on Jul 21, 2017

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Anonymous

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SOURCE: 95 cadillac eldorado engine stalls rough idle check engine light is on

My son has this same car with the same problem. So far after tune up and other process of illimination, the problem points to the catalytic converter. If it is clogged you will get this problem with the rough idle and stalling. Look under the car at night after running it and see if the catalytic glows red. If so you need a new one. Hope this helps.

Posted on Mar 20, 2009

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Anonymous

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SOURCE: 1997 cadillac concourde deville, car wont start

Try to reset the p.c. by unpluging the batt. for 10 min that should do the trick.

Posted on Apr 05, 2009

honeymokey

honeymokey

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SOURCE: No power

Code eo52 indicates that the "long term" memory in the ecm has been reset. You will get this code when power is removed from the ecm. B448 is low refrigerant pressure. B552 indicates that the keep alive or "long term'' memory in the bcm has been reset ans a result of power being removed forom the bcm. What is a TPC? The throttle position sensor should be set at -1.0 to +1.0. at lowest position by the ICS motor. The throttle position sensor should be set at 10.5 to11.5 when the ICS motor is at its maximum extension. This is done by the ICS plunger adjustment is at its lowest point. . A mis adjusted TPS sensor will result in a great loss of fuel mileage. It appears the converter is stopped up on yours.

Posted on Apr 26, 2009

Lorenzo Lamanna

  • 113 Answers

SOURCE: 2000 catera cold start idles rough and dies. After

Did you have battery disconnected or dead recently?

Try to place ignition in run without starting engine for 3 minutes (shut off all accessories and lights etc..). Then shut it off and then start it. Should relearn the idle.

If this doesn't fix the problem, unplug the MAF sensor, if it runs fine with it unplugged, its the MAF sensor.

Exactly what happened on my wife's 01'.

Posted on Jul 25, 2010

Anonymous

  • 2 Answers

SOURCE: 2003 cadillac cts 3.2 liter..rough idle, scan tool

Did you ever find a solution to this? I am having the same issue on 2,4,6. I have replaced the coils. checked the intake for vacuum leaks. I am lost here let me know if you find anything and I will do the same.

Posted on Jan 24, 2011

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1 Answer

If you let truck idle for a while it will stall and once again must let it sit for a few minutes and it will start.


How to Fix a Car That Stalls: 7 Steps (with Pictures) - wikiHow

www.wikihow.com > ... > Cars > Car Maintenance and RepairwikiHowFortunately, this usually does not signal a major repair to your vehicle, and it cangenerally be ... Does the car idle roughly and stall when at idle? .... has been running for a while, the fuel pump may overheat and stop working, stalling the car.

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Car loses power for short time after normal running and cooling down for ten minutes


sounds to be symptomatic of a CTS (coolant temperature sensor). there are two, one is for the interior temp gauge, the other is for the ECU/PCM while both are basicalty the same part, often even the same P/N, they both do extremely different things.

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Car runs but sometimes dies as your going along wait a few minutes and it starts and runs again


Seen this many times on Grand Cherokees. The crank sensor is going bad. Replace it with a dealer crank sensor, not an aftermarket one.

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1 Answer

Roaring engine when started


Sounds like your car is over fueling. My first quick look is to make sure your throttle return spring is intact and still connected. Next remove the air ducting between air cleaner box and throttle body so that you can see that the throttle plate is fully closed at start up. If OK then reinstate the temporarily removed ducting. Next I would check your fuel pressure relief (FPR) valve on the fuel line. When the engine is running remove the vacuum line attached to it and check for fuel dribbling from it or a strong smell of fuel. If the FPR is normal and healthy the engine would normally increase in revs for few seconds and then begin to idle roughly. Put your finger over the end of the disconnected vacuum line (if healthy the engine would resume normal idle after aout 5 seconds) and watch the side arm of the FPR for about two minutes. If fuel eventually spits out then change the FPR. Sometimes the diaphragm within the FPR which is acted on by engine inlet vacuum can split and the fuel behind it is sucked into the inlet plenum making the engine rev and idle roughly.

Feb 23, 2012 | Chevrolet Cavalier Cars & Trucks

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Misses run and idle spark plugs black; started after i bottomed out on a road


if pieces are come out the tail pipe from the convertor, the convertor my very well be clogged with rust. just beat the hell out of the catalytic convetor with a hammer, then get in and rev the engine to blow the junk out. i personally witnessed this on a vehicle and there was never another problem with it.

Nov 16, 2011 | Cars & Trucks

1 Answer

Idles rough and acts like its going to die then revs up....acts like its not getting gas sometimes....when under pressure the air blows out of the defrost instead of the panel


you have a vacuum problem, I would have the intake gasket checked or you can spray carb/choke cleaner around the intake where it meets the heads and if the rpm of the motor reacts then you have a leak, my explorer was the same way, idle raised and lowered,idled rough, stalled, and my vents acting up. new intake gaskets a month ago and wham runs great. My yukon i did 2 days ago as it had the same actions and yep it runs great now. I'm sure its your intake.

Feb 03, 2011 | 1999 Ford Expedition

1 Answer

Revs up and runs rough then stalls, it runs very rough, it can barely idle, put in gear and it stalls


I would like more info on the vehicle, as to the engine size. There are vacuum leaks on this engine, both the 4cyl and 6cyl. The injector lower seals are prone to cause this condition, but to check for this and to do it safely, is have it smoke tested with the proper test equipment. The EGR valves can also stick partially open, causing a rough idle and then a idle fluctuation and a stalling problem. Another poss cause is the idle control motor is failing. This vehicle should be taken in for service at a very reputable repair shop. If not properly diag, will cost hundreds of dollars just to "PUT PARTS ON IT UNTIL IT RUNS GOOD".

Jan 07, 2010 | 1999 Ford Contour

2 Answers

1995 safari van w stalls when giving it gas. changed fuel pump and filter. replaced egr valve. sometimes rough idle. when it stalls just like you turned off key. then when you try to start it acts like it...


maybe your iac valve is not working? it takes place of a choke or temp sender to computer could be bad which controls t I.A.C. known as the idle control valve,do you have any codes?

Sep 01, 2009 | 1995 GMC Safari

2 Answers

My 1996 Buick Roadmaster LTD engine intermittently stalls.


U DON'T HAVE A CARBURETOR SO FORGET THAT, THE FUEL REGULATOR WOULD NOT CAUSE THIS PROBLEM. I AM A GM FACTORY TECH AND KNOW THIS WITH CERTAINTY. U COULD HAVE SLUDGE IN THE IDLE SPEED CONTROL AIRBYPASS VALVE.

May 06, 2009 | 1993 Buick Roadmaster

1 Answer

Idle irratic


Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Apr 11, 2009 | 2001 Chrysler PT Cruiser

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