Backfires through air manifold

2001 FORD RANGER
165,000 MILES • 2.5L • 4 CYL • 2WD • MANUAL
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RICHARD LODGE
  • MEMBER
  • 2 POSTS
Hard starting backfires a lot slow to respond to throttle low power, very hot exhaust manifold, have cleaned EGR and injectors. Replaced TPS, ICU cam sensor, MAF sensor, new timing belt marks on point and new plugs. I had injectors out to clean tested on fuel rail all pulsing at same time, new fuel pump.
Oct 1, 2018 at 4:53 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi and thanks for using 2CarPros.com.

Confirm that the catalytic converter is not plugged. Also, a rich fuel mixture can cause this, so I recommend checking the fuel pressure to make sure the regulator is working. Here are links that shows how it is done. Also, I attached a link that discusses different causes for a backfire.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

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

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator




Do these checks and let me know what you find.

Joe
Oct 2, 2018 at 6:53 PM
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