backfire blew up muffler

1989 CHEVROLET VAN
80,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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DAVE MATHIESON
  • MEMBER
  • 1 POST
back fired and blew up muffler. what is going on?
Feb 19, 2020 at 12:06 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good afternoon,

Sounds like you lost spark in the motor and the cylinders got a lot of extra fuel. Then the spark came back and ignited the fuel in the exhaust system and that was the result.

It could be either the ignition switch or the ignition module.

Roy
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Feb 19, 2020 at 1:33 PM
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