why is my 1990 f-150 backfireing threw the plentum

Asked by mherring197636 Feb 09, 2015 at 10:08 AM about the 1990 Ford F-150 XLT Lariat Extended Cab LB

Question type: Maintenance & Repair

my truck is backfireing threw the plentum I have checked the fuel pressure and it idles at 38 psi and drops to 32 psi on rev is that proper pressure if so what ealse could be causeing the problem

6 Answers
330

DodgeDan answered 9 years ago

possibly a valve. run a compression test if the backfire is consistent and steady

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