why is my 1990 f-150 backfireing threw the plentum

Asked by 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

7,085

misfire is there any check engine lights

no check engine lights

35,475

302 Engine?

35,475

Miles?

351 and over 100,000 I have changed timeing gear and chain in past

40

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

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