rpm goes up and down. Sometimes engine goes off. Somebody have a idea why ?

Asked by klappi Nov 10, 2010 at 07:02 AM about the 1999 Ford Expedition 4 Dr XLT 4WD SUV

Question type: Maintenance & Repair

6 Answers

papa answered 14 years ago

Bad EGR or throttle position scensor.

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Erick answered 13 years ago

items to look at would be mass air flow sensor, idle air control motor, and fuel pump

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Keelan answered 13 years ago

dont forget your ECTS (Engine Coolant Temperature Sensor)

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papa answered 13 years ago

ECTS wont cause his problem,all a bad one will do is give a false temp reading to computer and gaduge,yheir is one for both,but this is not his problem.

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Keelan answered 13 years ago

well im not going to argue with you about that one. it could also be an intake leak. check all your vacuum lines and intake manifold.

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