Question about 1991 Oldsmobile Cutlass Calais

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Engine has no power, Idles in Park a little rough and in drive with the foot on the brake idles rougher. Have replaced fuel pump and filter as well as catalytic converter and O2 sensor.

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THE FACT THAT IT GETS WORSE WHEN YOU STEP ON THE BRAKE INDICATES THAT YOU HAVE A VACUME LEAK.IF YOU DON'T FIND A LEAK,START PULLING PLUG WIRES OFF ONE AT A TIME TO SEE WHICH OF THE PLUGS HAVE FAILED,[THE ONE THAT YOU PULL OFF THAT DOES NOT CHANGE RPM IS THE ONE YOU'RE LOOKING FOR].

Posted on Oct 07, 2009

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'96 Mystique 2.0 trouble with idle. replaced idle mixing valve. I don't get any codes, I have to shift to neutral at a stop sign or light to keep from stalling. It gets real rough almost a lope.


troubles at lights may very well mean a vacuum leak from a faulty brake booster
test by stopping and then applying the park brake and taking your foot of the brake pedal
you can do this test in the garage
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My 2004 ford expedition idles rough like its going to cut off The idling jumps up and down in park or drive only when stopped Service engine light cuts off and on periodically what could be happening


run a teat. Remove the vacuum line from the brake booster and plug off. Start engine and see if it idles normally. . Put your foot on the brake pedal and apply the brakes . If the idle is still normal replace the brake booster as there is an air leak in the diaphram.. The service light is probably recording misfiring and air fuel mixture problems.. run fault codes any way just to check it out .

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Car idles rough in park also runs rough in overdrive


Sometimes a rough idle like that is a fuel filter. As you've already done the plugs and wires the fuel filter would be my next bet.

Mar 15, 2010 | 1993 Buick LeSabre

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Service engine light came on, on my 1995 Mercury Grand Marquis LS


i would first change the fuel filter with it being run low in fuel it may have picked up some trash off the bottom of the tank so change the fuel filter and see if it runs better

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1 Answer

91 toyota pickup 4cl idles rough when warm when brake is pressed


HI, i would advise to check the following areas for faults. replace any part that is fouled or malfunctioning.

1. Check the air filter- This device may be clogged or dirty. replace if visibly fouled.
2. Check the fuel pressure regulator- pull the vacuum hose of the regulator. if there is gas in it, replace the fuel pressure regulator.(if there is no fuel present in the lines, move on to the next check point)
3. Replace the fuel filter and, check the voltage at th fuel pump. you should get 12V at the pump. if its lower than twelve, chekc the ground for corrosion as well as the entire wiring harness as well. all the way to the relay for fualts.
4. Check the Intake Manifold Gasket for worn or damged edges. this ware and tare will cuase leakge. replace this gasket if found to be fouled in any way.
5. Check the freash air intake hose. this hose may be clogged or damaged.
6. Last but not least, check the injectors for leaking seals and, correct pulse as well. replace any injector with a weak pulse or , leaky seal.


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1 Answer

Idles okay, runs rough when gas applied


Either a bad MAP sensor, or TPS. What is the code for the check engine light? This will most likely tell you what it is.

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1 Answer

1987 Buick Lesabre T stalling and running rough


I just had the same problem. Replaced the fuel filter,still crappy idle and no acceleration. I replaced the fump pump along with the wiring harness and the fuel pump screen and my cars purrs like a kitten,has back to normal acceleration and idles better than before. Hope this is some sort of help to you. I did it myself. Total cost, a little over $120. Good luck. By the way, your fuel pump should be pushing out about 65 lbs of pressure. is it ???

Apr 08, 2009 | 1987 Buick LeSabre

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