Random misfires

2004 CHEVROLET TRAILBLAZER
118,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
Avatar
GRIVICCIO
  • MEMBER
  • 1 POST
Car runs rough, check engine flashes. Changed plugs and one coil (originally said number five misfire) now says random misfires.
Feb 28, 2019 at 12:28 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
Good afternoon,

Was the 305 and 300 the only codes?

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

I would start by checking the fuel pressure. Low pressure will cause this issue.

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

Roy
Feb 28, 2019 at 12:45 PM
Advertisement