Backfiring misfiring

1998 CHEVROLET SILVERADO
213,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
Avatar
ECONNER123
  • MEMBER
  • 5 POSTS
I have replaced motor recently along with rotor and plugs. twice the fuel spider has been replaced. filter for fuel and air been replaced. started hesitating and now backfiring. had this problem before the rotor cap. jumped sparks inside filed all the plugs and was dumping gas in the exhaust. that was about a month ago. ran fine for two weeks, now it's backfiring again. what is the problem? please help
Mar 31, 2019 at 8:55 AM
Advertisement
Avatar
ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good afternoon,

Do you know the fuel pressure? Low fuel pressure will cause both the hesitation and the backfire.

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

Roy
Mar 31, 2019 at 12:30 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
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.