Question about Buick LeSabre

3 Answers

On occasion when starting my 1994 Buick LaSabre, the RPM will race to approximaterly 2300-2500. After shutting the engine off and restarting two or more times it will start at 1000 RPM and drop to a 700 idle speed immediately. This occurrs most of the time on a cold engine but also can happen when warm. On occasion, if a sudden braking is done, the engine will act as it is out of fuel and almost die. Most of the time this happens when the gas tank is less than half full.

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  • vocalchord Jul 24, 2008

    Have replaced the TPS twice and it did not correct this problem

  • vocalchord Jul 25, 2008

    This is not a viable solution to this problem as the transmission shifts great and tbhis only is an apparent problem when the shift lever is in park for starting.

  • vocalchord Jul 25, 2008

    The transmission is fine!

  • vocalchord Jul 29, 2008

    At times when starting my 1994 Buick LaSabre the engine rpm races to 2300-2500 and sometimes higher necessitating restarting several times before it starts normally at approximately 700 rpm. This occurs when the engine is cold most of the time but occasionally does this when the engine is warm.

  • vocalchord Jul 29, 2008

    I would like "pyrhyc" to repost his comments as I lost them earlier while attempting to print them and cannot relocate his response regarding my 1994 Buick.

  • vocalchord Jul 30, 2008

    You have given me some good suggestions. I have replaced the EKG valve twice and plan to replace the fuel pump and fuel filter for the engine dying on a hard stop when the gas tank is under a third of fuel.



    Thanks.

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At times when you start it ,,the automatic choke may get stuck on,,, then realese its self


and for the fuel might be a problem in the pump its self,,,blockage,, or the fuel sensor

Posted on Jul 29, 2008

  • chris07551 Jul 29, 2008





    Pyrhyc

    Rank: Wiz
    Rating: 84%, 404 votes


    The throttle positioning sensor can cause this.


    Comment by Pyrhyc, posted on Jul 25, 2008
    The tranny won't cause this. Have you checked the EGR valve, and checked for any vacuum leaks or leaks in or around the intake manifold? If it's sucking air somewhere, especially around the manifold, it could overcompensate with gas and cause the surge. If there's a manifold leak, then when the engine warms up and the manifold expands, it could lessen the leak. Explaining why it does it more when it's cold. The braking, however, would suggest a vacuum hose leak, since mostly the break master cylinder is used for vacuum. When applying the breaks suddenly, the vacuum would increase, and in turn increase the sucking of air at the leak. Check for leaks and let me know.

    Comment by Pyrhyc, posted on Jul 25, 2008
    I know the transmission is fine, it wouldn't cause this problem. Have you checked for any vacuum leaks, like I suggested?

  • chris07551 Jul 29, 2008

    is that whAT you needed?

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Hello,
try checking the transmission fluid level first,If this is perfect then it could be a problem of torque converter, seals and solenoids..Dont worry Just check the fluid level first..Thank you!!..

Please post on how things turned on or for further assistance!!..

Regards!!..

Posted on Jul 24, 2008

  • Natesan Sabesan
    Natesan Sabesan Jul 29, 2008

    Did u check the transmission fluid level was it suffice??..

  • Natesan Sabesan
    Natesan Sabesan Jul 29, 2008

    Look and listen
    for a vacuum leak under the hood somewhere. Start the engine, listen
    for a hissing noise, and inspect the rubber vacuum hoses and their
    connections to make sure they are in good shape and there are no leaks.



    Double-check the air cleaner installation and the air cleaner box for a
    good sealed fit. Run your hands under the plastic ductwork from the air
    cleaner to the engine checking for leaks.



    Also,ask your mechanic to clean your throttle body of any carbon build up that might have accumulated there!!!..Thank you...


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The throttle positioning sensor can cause this.

Posted on Jul 24, 2008

  • 2 more comments 
  • Ryan Rogers
    Ryan Rogers Jul 25, 2008

    The tranny won't cause this. Have you checked the EGR valve, and checked for any vacuum leaks or leaks in or around the intake manifold? If it's sucking air somewhere, especially around the manifold, it could overcompensate with gas and cause the surge. If there's a manifold leak, then when the engine warms up and the manifold expands, it could lessen the leak. Explaining why it does it more when it's cold. The braking, however, would suggest a vacuum hose leak, since mostly the break master cylinder is used for vacuum. When applying the breaks suddenly, the vacuum would increase, and in turn increase the sucking of air at the leak. Check for leaks and let me know.

  • Ryan Rogers
    Ryan Rogers Jul 25, 2008

    I know the transmission is fine, it wouldn't cause this problem. Have you checked for any vacuum leaks, like I suggested?

  • Ryan Rogers
    Ryan Rogers Jul 29, 2008

    Here's my suggestion again.



    The tranny won't cause this. Have you checked the EGR valve, and checked for any vacuum leaks or leaks in or around the intake manifold? If it's sucking air somewhere, especially around the manifold, it could overcompensate with gas and cause the surge. If there's a manifold leak, then when the engine warms up and the manifold expands, it could lessen the leak. Explaining why it does it more when it's cold. The braking, however, would suggest a vacuum hose leak, since mostly the break master cylinder is used for vacuum. When applying the breaks suddenly, the vacuum would increase, and in turn increase the sucking of air at the leak. Check for leaks and let me know.

  • Ryan Rogers
    Ryan Rogers Jul 29, 2008

    Chris had a good suggestion with the automatic choke. Some of these are driven by vacuum and some are electrical. If electrical, you can disconnect it and see if it makes a difference, if vacuum, it goes back to what I was saying about a vacuum leak. Vacuum leaks can be hard to hear if they are very small, bur even a very small one can cause a big problem. If you can't hear one, let the system get a full vacuum, then have someone turn the car off, if small, it may hiss for a second or two after the engine has stopped.

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