Question about 1995 Buick Park Avenue

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Hello, symptons are at around 45 miles per hour

Hello, symptons are at around 45 miles per hour there will be a shaking that occurs. Take your foot off the pedal, it stops, hit the accelarator and get past the problem you can get up to 65 miles per hour and it could be fine. It may start shaking right there. Once again take your foot off the accelator, stops immediately. It seems to have been happening the most when the rpm's are right around 1500. Get it to 2500 to 3000 rpms and it is fine. Get to crusing speed where the rpms are going to back down to 1500 and it will start shaking again. I had a transmission guy say that it was in the torque convertor. We had wrecked a Le Sabre about a year ago so we had taken out the engine and tranny. Switched them and it didn't improve at all. Zero. We are in the process of changing out the struts and such. I changed spark plugs and wires and fuel filter. No improvement. Any ideas.

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  • Scott Smith May 13, 2010

    Could it be tires? out of alignment? Struts? Other front end problems? Like I said it does stop when you take your foot off the pedal.

  • Scott Smith May 21, 2010

    I thank the three people who gave me solutions to my problem. I appreciate it.

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  • Master
  • 1,857 Answers

Maybe driveshaft ujoints or axles. maybe harmonic balancer. If it was these It would progressively get worse. Your really going to need someone hands on to figure this out. Once all engine and drivetrains components are eliminated as being the problem, then your dealing with torq converter shutter issues. It wont be the struts if the car is sitting level. It wont be the shocks is the car seems firm when hitting bumps. It could be wheel ball joints if the tires are wearing abnormal.

Posted on May 19, 2010

  • Susan Price May 19, 2010

    if it stops when you take your foot off the gas I would be suspecting drive train or balljoint issues. Or even engine ot transmission mount issues. I can't say for sure because I can't feel the problem But if the shocks or struts or springs arnt rattleing and are on correctly then I wouldnt suspect those parts. If that tech though it could be that he would of mentioned it. I don't know how much of an inspection he did but the only way to verify anything is to do hands on inspection to try to get to the cause. All we can do is guess

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  • Expert
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Hi! Regarding this matter, Have you had a wheel balance lately? you may need to get your wheel balance checked for it may be the one causing you the shaking. If wheels are fine, I suspect a faulty MAF (mass air flow) sensor, it has big contribution on engine performance specially on the idling. It can cause a shaking too if its faulty, its like that the engine is gonna die or something. Struts and tranny will be out of the issue so you can skip that. Hope this helps and have a good one!

Posted on May 13, 2010

  • 3 more comments 
  • Scott Smith May 19, 2010

    O.K. I had a lot of work done on it the last couple of days. New Harmony tires balanced, new struts, fuel filter, tune up. So now, instead of the horrible shaking it has definetly settled down to where now it is more of a shudder. Even at idle sitting at a stop light about 35 percent of the time it will fluctualte between 750 and 1000 r.p.m.s every 5 to 7 seconds. If you work with it you can make it where it looks like there isn't a problem. As soon as it starts shuddering, I take my foot off the accelator for a moment. Then hit the accelator and get the r.p.m.s. up to to 3000 and it seems fine. Here is another example. Going up a mountain, 4000 r.p.m.s everything seems pretty decent, then it goes down to 2800 r.p.m.s and starts shuddering. Any ideas. Thanks much for your time.

  • dj_relly999
    dj_relly999 May 19, 2010

    Check the tire balance and check the stabilizer bushings, it can be helpful.

  • dj_relly999
    dj_relly999 May 19, 2010

    You may want to check the ball joint too and the tie rod ends for they may be worn and can cause wiggle too.

  • Scott Smith May 19, 2010

    When they did the alignment would they not have checked these things out sir. I figured when they did the alignment they would check for things like this. Thanks for your time. I appreciate it.

  • dj_relly999
    dj_relly999 May 21, 2010

    No problem, you're welcome. Have a nice day!

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  • Buick Master
  • 19,396 Answers

Hi.

The first part to address would be the torque converter, but this had already been checked and replaced.

If the shaking is caused by the auto tranny shifting in gear too late, check the throttle position sensor. This is mounted on the throttle body and it is used by the transmission control module to determine when to shift in gear.

Check also if there is misfire. In that case the shaking will be caused by a different problem, and there will be engine codes stored in the ECU.

Regards.

Posted on May 13, 2010

  • Ginko
    Ginko May 13, 2010

    Hi.

    Yes it can be tyres and alignment, but I discarded the most obvious because you told me a mechanic worked on the vehicle already.I guess that before doing all that job he checked tyre balancing and alignment.

    Regarding struts and mounts, they will cause the whole car shaking , but the problem would not happen only at about 45mph and 1500/3000 rpm.

    I see that I received a bad feedback. The question will be passed to a different expert.

    Good luck.

    Ginko.


  • Ginko
    Ginko May 21, 2010

    You are welcome.

    Let us know if you need further help.

    Regards.


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