1989 backfiring and stalling when engine is hot?? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-12-2004, 10:20 PM   #1
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Default 1989 backfiring and stalling when engine is hot??

Cananyone shed some light 3.8 ltr
new plugs

thanks
Jaswasup
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Old 11-12-2004, 10:22 PM   #2
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sounds like a tps sensor, ignition coils or control module
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Old 11-12-2004, 10:40 PM   #3
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are these seperate?coils
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Old 11-12-2004, 10:43 PM   #4
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u have the magnavox system or the individual system?
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Old 11-12-2004, 11:17 PM   #5
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He'* got the magnavox.

Does it backfire on the intake? And like make the airbox shake and make a loud pop? Mine did that all the time, then it went away, and it did it all up till I changed my ICM + coilpack. If your'* is backfiring out of the exhaust, it may be a different problem, but the ignition system is a likely problem. A tune up may be in order. A new set of plugs and wires.. or if you want to be cheap, make sure your wires aren't touching at all.. if they are, make sure you separate them.


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Old 11-13-2004, 12:01 AM   #6
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Default coils

thanks guys i will try tommorrow some stuff and let you know
Are the 88 and 89 coils interchangeable??
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Old 11-13-2004, 08:28 AM   #7
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88/89 coils are interchangable IF the 88 has the LN3 [the coils will be mounted in the SAME location as yours, to be compatable.] If the coils are on top of the rear of the engine, then it WILL NOT work. There are three bolts underneath the coilpack bracket, to remove BOTH the coilpack and ICM. The 6 on top will only remove the coilpack. Remove both, because our ICM'* tend to fail with the coilpack. I believe the bolts are 7/16 [or 10mm], but I could be wrong. It'* around that size, and you will need it in box head form, trust me on this one.


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Old 11-13-2004, 12:17 PM   #8
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"new plugs " <- first thing I would check for is for a wire on the wrong plug (would be two).
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Old 11-13-2004, 12:53 PM   #9
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Default coils

Yes the plugs wew changed one at a time and all wires back to same loc.
Trust me i took my time lol
today i will change the coil pack and icm
By the way i am parting out my 88 sse white w/grey leather if anyone needs something
thanks
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