SPONSORED LINKS

Back firing through exhaust

Tiny
THEODORE SHAUGHNESSY
  • MEMBER
  • 1991 BUICK REGAL
  • 3.8L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 89,000 MILES
Under a load such as taking off from a stop or going uphill car back fires through the exhaust. I replaced plugs, wires, coil pack and coil pack module and exhaust from manifold back and I am afraid of blowing out the new exhaust which will void the warranty. Still having the same problem. Any help would be greatly appreciated.
SPONSORED LINKS
Saturday, February 18th, 2017 AT 2:23 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,895 POSTS
Hi THEODORE,

It sounds like you may have a broken valve spring that is not returning the valve to the closed potion under load. Also I would do a fuel pressure test to make sure enough fuel is entering the engine. Here are a couple of guides that will give you more of idea what to look for and how to fix it.

https://www.2carpros.com/articles/engine-backfires-while-running

and

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

Please run some tests and get back to us so we can continue helping you.

Best, Ken
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, February 20th, 2017 AT 10:50 AM

Please login or register to post a reply.

Related Engine Backfire Content

How To Fix an Engine Backfire
VIDEO
How To Fix an Engine Backfire
Instructional repair video
Backfire Repair
GUIDE
Backfire Repair
When your engine backfires it can do so in one of two ways. First and the most common way is when the engine is running a small explosion of unburnt fuel is ignited inside...
VIEW MORE

Sponsored links