Question about 1995 Oldsmobile Eighty Eight

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My 95 olds 98 with 71k goes into a jerking fit at around 50 MPH. It feels "electronic" to me as opposed to transmission related.However if I run the car in third gear, the problem is diminished. I can feel it to a degree on hard acceleration.and also hear the slight sound of a misfire. Any thoughts? Thanks.

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  • Oldsmobile Master
  • 2,359 Answers

There are two possible locations to cause this problem.

1) bad ground to ECU
clean and tighten all grounding spot under the hood.

2)leaky air intake tube

False reading to ECU.

Close up all hose on the leaky air tube between air filter box to the air intake on engine block

Posted on Jul 15, 2009

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Posted on Jan 02, 2017

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www.MauiCarRental.biz

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Hi there, let me see if I can help.

There's not much info to go on here, but let me try.....

Ok, if it's "pulling or stopping" in a jerking motion. It sounds like it might be engine related, however, it can be transmission issues also. Lets talk about engine.

Are there any check engine lights? That may be a clue that it's engine related...such as an engine miss.
Try putting the car in park and rev the engine from idle. (note: don't go into the red zone on RPM.) Does if feel rough and jerky? this eliminates the transmission. If so look at cyl miss issues, timing belt "out of time," EGR stuck open....etc...


If the engine passess this test, test drive the vehicle for transmission problems. Find an open road that does not have much traffic. Test at 20, 30, 40, 50, and 60 mph. go to a cruise at speed indicated and then accelerate at light throttle and then heavy throttle then coast.

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if it does it on most of these speeds (particulary at higher speeds) look at inner C/V joint. You will need to take apart the joint and look at the race for ridges. The vibration can happen when the rollers fall into the worn spots and causes a "jerking" feeling when applying power. (look for leaking grease from inner joints. Damage usually happens when all the grease leaks out.

If it only happens at and around 40mph, it could be a torque converter clutch. Try a transmission flush.
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It might need a transmission it it continues after the flush, or you have some other problem that isn't obvious to me with the given info. Hope this helps and happy hunting.

Chris

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