Question about 1989 Chevrolet Cavalier

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89 Chevy 2.8L #3 & #6 misfire.

1989 Chevy Cavalier 2.8 misfire. I replaced the #3/#6 coil and it still misfires. Totally dead on those two.

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  • johnetter Sep 06, 2009

    On my 89 Cavalier Z-24 conv. It was my module that caused the misfire. First you have to eliminate the coil as the possible problem. The only way is to swap coils to see if the problem follows it or try a new one. If nothing changes it's the module that the coils bolt to. It's a real pain changing it. No space. It's not like my 65 Impala or 72 Vega GT. $115 later end of problem. Just 76,770mi on it and it runs like a champ now.

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The ignition modulator may have to be replaced, you can pick one up at Auto Zone and it's still pretty expensive so you may want to try the Salvage yards. The ignition modulator's are common interchangeable part for the GM line so you can get one from a newer car then your 89 cavalier. Good luck and hope this helps. I believe Auto Zone can also test the ignition modulator too, the modulator is what the coils sit on. 

Posted on Sep 04, 2009

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Swap the coils see if problem moves to another cylinder. You can go to a junk yard and get another or autozone. There are also MSD options for that car. If you get MSD I reccomend plugs and wires.

Posted on Sep 21, 2009

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  • Contributor
  • 26 Answers

Its unlikely but,...... Has happen before that you got a bad coil from where ever it is that you bought it from,

I have heard a Crank shaft Sensor can cause misfires but, it's Hard to tell if that's the case:/

You replaced the Coil, Wires and plugs?

Posted on Sep 04, 2009

  • Jamie Sep 04, 2009

    Good Ideal :) Check you're ignition modulator as well. :)

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