Cylinder misfire

1999 BUICK PARK AVENUE
129,000 MILES • 3.8L • V6 • TURBO • 2WD • AUTOMATIC
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GEELO808
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  • 2 POSTS
We have replaced the fuel injector and the spark plug as well as the wire for the cylinder and it is still misfiring. Checked injector pulse and we are getting no ground pulse at the injector. We have narrowed it down to the ECU but are in need of a schematic for the ECU. Are you able to provide this schematic? I hope you can help us. We greatly appreciate you taking the time to read this request.
Jul 12, 2018 at 12:53 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good evening.

Yes, I atached the diagram to this post for you.

If the wiring is good at the PCM, then it is a failed quad driver in the PCM.

Roy
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Jul 12, 2018 at 7:20 PM
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GEELO808
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Thank you very much Roy. I appreciate all your help. I will post the outcome of this repair soon.
Jul 13, 2018 at 7:20 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Sounds good. Feel free to ask any follow up questions.

Roy
Jul 13, 2018 at 7:25 AM
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