Mechanics

BACK FIRE

1989 Jeep Wagoneer • 6 cylinder 4WD Automatic •

Below 2000 RPM it back fires and cuts out
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Bighand
February 19, 2011.



I have no replies

Tiny
Bighand
Feb 19, 2011.
http://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

Rasmataz
Feb 19, 2011.
It only below 2000 RPM and in revser

Tiny
Bighand
Feb 20, 2011.
Check the fuel pressure with a fuel pressure gauge and comeback with the readings

Rasmataz
Feb 23, 2011.