back fire

1989 JEEP WAGONEER
6 CYL • 4WD • AUTOMATIC
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BIGHAND
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  • 4 POSTS
below 2000 RPM it back fires and cuts out
Feb 19, 2011 at 6:08 PM
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BIGHAND
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  • 4 POSTS
I have no replies
Feb 19, 2011 at 8:18 PM
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RASMATAZ
  • ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
https://www.2carpros.com/articles/what-is-an-engine-backfire

Common causes of backfires are:

Poor or unregulated engine timing is often a cause of intake backfires, but can also be responsible for exhaust backfires
Improper wiring in the ignition can also lead to timing issues and backfires
Low fuel pressure, clogged fuel filters, and weak fuel pumps could cause a severe lean air-to-fuel ratio during fuel injection
Missing or damaged catalytic converter can result in backfires out the tailpipe
Air injection problem/diverter valve/check valve
Feb 19, 2011 at 10:03 PM
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BIGHAND
  • MEMBER
  • 4 POSTS
It only below 2000 RPM and in revser
Feb 20, 2011 at 12:09 AM
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RASMATAZ
  • ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Check the fuel pressure with a fuel pressure gauge and comeback with the readings
Feb 23, 2011 at 9:53 PM
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