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#1
02-23-2010, 10:54 AM
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1998 ford expedition fuel pressure
my fuel pressure is 40psi and the book says thats what it should have but autozone says 80-100psi it backfires and is slugish after 45mph could this be the knock sensor causing all this trouble
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#2
02-23-2010, 06:26 PM
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Re: 1998 ford expedition fuel pressure
Your specs are OK From the Ford Manual
Engine Running kPa (psi) 193-310 (28-45) Key On Engine Off kPa (psi) 242-310 (35-45) If your fuel filter is partially plugged, it can cause the problem. So can an engine misfire. You need to have a scan tool installed and read the PIDs before we guess away and cost you a lot of money.
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