Backfired and now it won't start?

Tiny
FORDREBEL87
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 15,290 MILES
My brother has a 97 chevy silverado 1500 4.3 vortec motor it was running then all of a sudden it backfired and now it won't start what do you think is the problem I cut the cat out and it still won't start
Tuesday, August 3rd, 2010 AT 11:46 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

An engine backfires due to having unburnt fuel being ignited inside the intake and creates the loud bang.
This explosion can bend the throttle actuator plate, push intake gaskets outward creating a vacuum leak and even blown apart a plastic intake manifold. When intake manifolds were made of aluminum they could better withstand this kind of problem.

This is a helpful article on backfires. This will help you guide thru what to look for.

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

If the backfire is severe enough it will blow out gaskets and which will prevent the engine from starting.

Please let me know of any questions.

Thank you.
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Sunday, August 8th, 2021 AT 12:10 PM

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