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Misfire, random, changes cylinders and banks

Tiny
TRAVIS1922
  • MEMBER
  • 1997 PONTIAC FIREBIRD
  • 5.7L
  • V8
  • RWD
  • MANUAL
New opti spark installed, new plugs and wires, flow chart on fuel working properly, and all injectors firing. Misses on acceleration, popping.
Tuesday, April 14th, 2015 AT 3:48 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Make sure your ignition is set up correctly and wires going to right cylinders. And check coil. Was it doing I t prior to the work that you did? It may be a basic engine problem. Also check for a vacuum leak as well and check fuel pressure with a gauge auto parts rent it.
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Tuesday, April 14th, 2015 AT 3:57 PM
Tiny
TRAVIS1922
  • MEMBER
  • 2 POSTS
Yes it was doing same thing
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Tuesday, April 14th, 2015 AT 4:02 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Then it wasn't the parts you changed to correct it. If it had a misfire code like 300-308 those are very hard to diagnose and apro should do it because it can be any sensor causing the problem. Your fuel pressure should be 41-47psi key on engine off test that, vacuum leaks then compression
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Tuesday, April 14th, 2015 AT 4:29 PM

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