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Backfiring and replace most parts

Tiny
DOCACK
  • MEMBER
  • 1987 OLDSMOBILE CALAIS
  • 92,000 MILES
I have a 87 olds Calais - engine light came on, I put tester on the car and replaced EGR valve, O2 senser, MAF, plug wires, new plugs. Car still idea's ruff and backfires in back muffler (many short backfiles). I didn't replace the senser that is contected to ERG. Any help would be great
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Monday, September 26th, 2011 AT 3:16 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
First of all, what were the codes. I doubt all those parts failed at the same time.
If you have the old style coil pack that is 3 coils in one, it is called a magnavox system. It is common for this to overheat and cause this issue. You must replace the coil pack and module as an assembly.

Roy
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Monday, September 26th, 2011 AT 3:25 AM

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