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Misfire cylinder number six

Tiny
RENE C
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 240,000 MILES
My dog shewed on the cables of the ABS unit. ABS and brake light came on. Got under truck and reconnected the chewed cables, but the light didn't turn off. Suddenly I began having a misfire on piston #6. Changed plugs, swapped coils, changed coil connector plug, checked for air leaks, compression, injector, and nothing. The misfire continues. I truly need help solving this mystery.
Thanks,
Rene C
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Thursday, April 15th, 2021 AT 1:57 PM

6 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

I would check the fuel pressure to be sure it is not low. Low pressure from a weak fuel pump will cause the misfire.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

What was the compression? It needs to be 140-160 pounds.

Roy
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Thursday, April 15th, 2021 AT 5:06 PM
Tiny
RENE C
  • MEMBER
  • 4 POSTS
Hi Roy, thanks for responding. Compression is at 149 lbs. Could there be a relationship between the ABS module and the number six cylinder misfire?
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Thursday, April 15th, 2021 AT 5:33 PM
Tiny
RENE C
  • MEMBER
  • 4 POSTS
Will check fuel pressure next. Thanks!
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Thursday, April 15th, 2021 AT 5:35 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, no connection.

Keep me updated.

Roy
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Thursday, April 15th, 2021 AT 5:37 PM
Tiny
RENE C
  • MEMBER
  • 4 POSTS
Will do Roy. Thanks again!
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Thursday, April 15th, 2021 AT 5:38 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Thursday, April 15th, 2021 AT 5:42 PM

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