Truck backfires and will not start

Tiny
GHAYES988
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
Replaced fuel pump, has good pressure, truck backfires and won't start.
Friday, December 10th, 2021 AT 1:41 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,772 POSTS
Hi,

Did this happen all at once? Have you confirmed the fuel pressure is within the manufacturer's specs? If it's too high due to a faulty fuel pressure regulator, that can cause backfiring. Also, a very lean fuel mixture can do the same.

Take a look through this link first and let me know if anything helps:

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

Also, try disconnecting the MAF sensor and see if it starts. (See pic 1 for location)

Let me know what you find.

Joe

See pic below.
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Friday, December 10th, 2021 AT 8:49 PM

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