I've been battling this for over a year. Any suggestions???
This is a 2000 Ford Explorer. 4.0 SOHC with 88K mi. - Originally a Canadian car, now in Washington state. It runs great but idles crummy, much more in gear, then in park. It sort of vibrates, and shudders a little. Just enough to make things rattle. Never dies though.
ALLDATA indicates idle speed spec. is: Hot Idle 670-750 Scan tool shows avg. idle is 645 in gear. ALLDATA indicates - low idle, look at fuel, and or ignition? ALLDATA indicates - vehicle has foul resistant injectors, should not require cleaning.
ALLDATA indicates - Fuel spec. 30 - 65 lbs. Tested = Idle in gear 65 - 69 / Idle in park 66 - 68 (never drops to 30) Leak down test - Fuel system dropped 15lbs. immediatly, then held for several minutes. This vehicle uses a mechanically regulated non - return type fuel pump
88k Miles 20k ago changed, plug wires, fuel filter. Last 6 months changed, spark plugs, IAC, air filter, cleaned the MAF sensor, two applications of injector cleaner, and cleaned the throttle body.I think something is causing it to idle too slow. Do you think a slightly high fuel pressure will do that? Also fuel pressure spec indicates 30 to 65. This car doesn't drop to 30. but I don't see how it could, because the system uses a spring loaded bypass at the pump for regulation.
Thanks again, Rick