1998 ford expedition fuel pressure
dessie
02-23-2010, 10:54 AM
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
way2old
02-23-2010, 06:26 PM
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.
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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