Posted by Bryan in Iowa on June 27, 2009 at 18:41:25 from (64.12.116.74):
In Reply to: OT-91 Ford Explorer posted by Coloken on June 27, 2009 at 09:34:11:
Most common things I have run across . Fuel pressure regulator , pull vac line off it ,if wet or fuel spray out after you turn key on ,it's bad . Vac modulator in trans , look at the vacuum lines, if they are soft and spongey ,tranny fluid is getting sucked up from modulator , some lines may get so loose they fall off . Throttle position sensor , replaced a ton of these, can cause all kinds of idle /hesitation problems . Plugged fuel filter! filter is down on frame rail ,out of sight out of mind ! Bad grounds , check for corrosion along fender grounds rad support , etc . Dirty injectors , if it has a lot of miles a quality inj service such as motorvac will make a big differance . Bad Idle air control actuator . Also ,,as Brian mentioned , bad egr valve .
These motors have a laundry list of pattern failures. don't see too many in shop anymore . We call them "exploders "
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