Intermittent Misfire and Engine Bucking


My 1995 Oldsmobile Cutlass is bucking on acceleration. Compression OK 150 all around,fuel pressure (42psi), new fuel filter, replaced ignition wires. Most noticeable on easy acceleration after torque converter lock up.....thank you.

Answer: Most of the time a misfire under load like this is caused by an ignition problem. Usually a plug wire. Since they were replaced, i would suspect a cracked spark plug. Remove them all and inspect them. Look for a crack in then porcelain, or signs of carbon tracking. I would assume the ignition coils looked OK when replacing the wires. If all plugs are OK, then this could also be a possible transmission problem. Acceleration with TCC lockup may cause the TCC solenoid to be shuddering if it is faulty. It should kick off on accelerate.


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  • Guest - Robert

    List all pieces that can leak oil

  • Guest - Tony

    In reply to: Guest - Robert

    List all pieces that can leak oil
    <br />This article has nothing to do with oil leaks. It is about a Cutlass Supreme that has a bucking engine misfire. I am sure you could have found a better article to post this comment. But anyway, a list of all things that can leak oil?<br />Upper intake manifold gaskets.<br />Low manifold gaskets.<br />Oil pan.<br />Valve covers.<br />Oil drive plug seal.<br />Oil pressure sensor.<br />Rear main seal.<br />Front crank seal.<br />ETC.

  • Guest

    My 1992 Oldsmobile Cutlas Supreme stalls when idling. When going down the highway the rpms and the speedometer shoot up without me hitting the gas petal. Any ideas.

  • Guest - Bob

    In reply to: Guest

    My 1992 Oldsmobile Cutlas Supreme stalls when idling. When going down the highway the rpms and the speedometer shoot up without me hitting the gas petal.Any ideas.
    <br />Many things can cause an idle problem. A vacuum leak, carbon in the throttle, a bad sensor etc. Accelerating when at a steady speed could be a bad throttle position sensor (TPS). Have the codes scanned- that may give direction as to what needs repair. Unless the engine and vehicle speed are not actually going higher- then maybe a bad dash gauges cluster.

  • Guest - Paul

    Plugs did the trick. It runs like new. Thanks again for your help and advice.

  • Guest - Tech

    Yes, I would replace the spark plugs first.

  • Guest - Paul

    Removed ignition wires individually from coils with engine running. Good spark to ground on each. Suspected plugs, however also think trans filter should be changed. It's a used vehicle, not sure if it has ever been changed. 142,000 km on vehicle at present. Owned it since 50,000km. Plugs are NGK platinum tip, 26,000 km on plugs<br /><br />You think I should try plugs or trans filter first? Thanks in advance for your help.

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