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Missfire #5

Tiny
RAY1024
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 178,000 MILES
I have a 2002 trailblazer with missfire #5 I have replaced coil plug injector pig tail looked for crack in wires.I erase codes and comes right back I got a cm butt want to make s hure it will fix it before I spend the money to get it flashed.. Please help.
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Wednesday, January 27th, 2016 AT 7:57 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check compression then have a pro freeze frame it to see if it's a sensor giving the problem as they will cause this. Also check fuel pressure with a gauge auto parts rent it
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Wednesday, January 27th, 2016 AT 9:28 AM
Tiny
RAY1024
  • MEMBER
  • 2 POSTS
Ok ty for your help. What should the compression be
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Wednesday, January 27th, 2016 AT 11:31 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Anything over 90psi is good
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Wednesday, January 27th, 2016 AT 11:59 AM

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