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I have 1999 Chev Cavalier 2.4 The car miss sometimes,very weird sometimes it misses from the start, sometimes after it is hot. I had it on computer it showed the coil pack was bad,I have changed that twice.new plugs and new sleeves on the spark plugs. On the hand held analyzer it showed mass air,changed that now have same problem. Sometime it shows 02 sensor and some times shows faulty tpi. Got any ideas?

Submitted: 53 days and 8 hours ago.
Category: Chevy
Value: $23
Status: AWAITING CUSTOMER ACTION
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Year: 1999

Posted by ironmike 53 days and 8 hours ago.

Answer

Greetings,

I have seen a few that have the plastic housing(holds the module and 2 coils) fail from arc tracts from the ignition spark . The housing can be purchased aftermarket. Kind of like when the distributor caps would develpe spark tracts and ahve misfires. The sleeves do go bad but check for cracks.

good luck

53 days and 7 hours ago.

Reply

I have already replaced the coil Pack which Is the alumin cover on top of the motot,which contains the coils and module directly above the spark plugs. Are we talking about the same part? Or something different.

Posted by ironmike 53 days and 6 hours ago.

Answer

The odd shaped plastic that the boots snap on. That goes bad. This plastic part.
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52 days and 23 hours ago.

Reply

If these are the boots that go between the spark plugs and the coil pack(Plastic sleeve with rubber insert) I have already replaced them.

Answer

If you have a misfire we have to isolate it and find which one and when. If we can find through a history code or power braking and watching a misfire graph we can try swaping injectors. I will check on tps, what is the o2 doing?

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Expert: ironmike
Pos. Feedback: 100.0 %
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Answered: 10/1/2009

ASE Master Tech & T2 diesel engines

28 years experience foreign & domestic, Ford certified 05-06 GM certified 09

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