1978 Ford Bronco back fire

Tiny
JACKDOG1978
  • MEMBER
  • 1978 FORD BRONCO
  • V8
  • 4WD
  • AUTOMATIC
  • 500 MILES
Reset timing checked all vacum lines put new spark plug wires on engine backfires under load
Thursday, January 7th, 2010 AT 10:51 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Have you checked engine compression? You may have a burnt valve. Also, are you sure you are getting a good hot spark, and where does it backfire from the exhaust or intake?
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Tuesday, January 12th, 2010 AT 7:26 AM

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