Question about 1990 Buick Regal

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1990 buick regal limited 3.1L V6 rough running/no power

My 1990 buick regal limited 3.1L V6 starts and stays running fine although it vibrates a bit. When you let it idle the engine is a little shaky but not too bad. The second you give it any gas at all even in park or neutral the engine shakes worse which you can feel in the seats. If you put it in drive to start moving and give it some gas it shakes as well and has a serious lack of power. There isn't much difference between 1/4 throttle and full throttle. I have replaced the spark plugs, cables, and did a carbon treatment with no luck. Any ideas?

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Sounds to me like your missing on a cylinder or two, the coil pack is on the front of the motor just below the head, i would trace the wires and make sure they connections are all good, then check the firing order and make sure they are correct, once thats done the next step would be to have the coilpack tested (this can be done at most parts stores) the only other thing it could be spark wise is a crank or cam sensor(in most cases the crank sensor controls spark up to about 4 or 500 rpms once the motor fires the ecm takes over) once all thats done and everything is fine then the issue is fuel delivery not spark at that point it could be anything from a faulty pump relay to a MAF sensor, faulty injectors, bad fuel filter, etc... hope this helps, good luck!

Posted on Feb 12, 2012

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Replace the coil pack.

Posted on Jul 24, 2009

  • Philip Long
    Philip Long Jul 26, 2009

    folow plug wires back to the coil packThe wires come from that.good luck.

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