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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.
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Saturday, February 18th, 2017 AT 2:23 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,722 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
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Monday, February 20th, 2017 AT 10:50 AM

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