1996 Chevrolet Cavalier Logo

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Posted on Oct 30, 2008
Answered

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

  • Anonymous 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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  • Contributor 8 Answers
  • Posted on Nov 03, 2008
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Joined: Nov 03, 2008
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Your problem sounds like an intermittent short in the power feed to the coil pack from the EEC module

A

Anonymous

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??

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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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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.

Thank you for using FixYa, have a nice day.
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I have a 2003 Santa Fe with 3.5 6cyl engine that is ideling rought & lots of missing off a stop. had codes PO001,03,05. Had wires & plugs replaced 2 weeks ago & still running rough. Now...
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Ok odds are you just need a routine tune up. Plugs, fuel filter, air filter. Now this engine uses coil packs i think, so you wont have normal plug wires. The coil packs are individual and sit directly on the plugs. So it is possible you have a bad coil pack. These engines were known to have this problem in excess. So try the cheap fixes first. plugs, fuel filter...these two is the best two to try first.. The air filter wont cause a bad miss unless it is completely dobbed up. so just for your own good to change the air filter.Now if neither the plugs or fuel filter fixes this car try this. Each coil pack will have an individual plug on top of them. So listen closely to your engine. Unplug each coil pack one at a time, Now evry time you unhook a plug the engine should miss, so unplug one at a time, and if the engine does miss they are working properly. Now if you unhook one of these and there is no change in the idle of your engine, my friend you have found the problem. All you have to do if you find one that does not change the engine idle, you just go buy a coil pack and replace it. This should fix you right up
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