Question about 1996 Chevrolet Cavalier

2 Answers

Coil pack keeps going bad,

I've replaced the coil pack and plugs and wires and it runs good for about two weeks, then the engine has a miss in it when it idles and stumbles on acceleration [i've replaced the coil pack,plugs and wires for this same problem twice]

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  • bovet Nov 03, 2008

    Thanks we just did that and the problem is still there the module was tested and it's good, now it cuts out on acceleration and sometimes at an idle

  • Kyle stoddard May 09, 2013

    mine as well!!! not too sure??

  • Anonymous Mar 12, 2014

    When travelind at 20-40mph car drves fine then hit Hwy speed and it starts to **** intermittently, my mechnic says that when he watches he the spark plugs wires under acceleration he notices spark boot rides up on the coil pack thus getting good coonnecton, can this be fixed with out buying another new set and installing it, can I just replace plugs going to coil packs or mayb coul pack is bad. Plug wires and plugss
    Are two years old, how often should they be changedus

  • Anonymous Mar 22, 2014

    Vehicle heater core blew and now vehicle is very hard to start and idles very Badly. I have replaced plugs, wires, cap and rotor, coil pack, and fule filter. Looking for help

  • Anonymous Mar 26, 2014

    While the car was running,the catalytic converters started turning red.Replaced optispark,coil,spark plug wires,spark plugs twice.

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  • 8 Answers

Your problem sounds like an intermittent short in the power feed to the coil pack from the EEC module

Posted on Nov 03, 2008

What exactly did you do? did you replace the power feed from the eec and if you did, did you use the same gauge wire from the eec to the coil pack??

Posted on Nov 03, 2008

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What causes the engine to miss fire on #2 cylinder?


If you shoot me your year I might have the info you need. And - depending on your year - the 94ish years had TWO coil packs for the 4 cylinder - 8 plug wires basically. When any of the leads of either of those coil packs goes out - youre going to experience a miss condition. If it's the v6 - you've got a cam sensor that can cause that type of action - and have you checked your throttle positioning sensor? If that goes out - the ecu will get mixed signals and can act like that as well. If you can tell me the year I'll see if I got the info you need. All the best.

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A code P0304 may mean that one or more of the following has happened:


Faulty spark plug or wire
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If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.


If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.




Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

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