My 99 f150 5.4L will turn over but won't crank. I can tap the relay pump comes on tap it again it goes off. When the pump is running it won't turn off. When the pump is running it still won't crank.

50

Asked by May 22, 2015 at 10:37 PM about the 1999 Ford F-150

Question type: Maintenance & Repair

7 Answers

you got air? u got fuel? you got fire? youre missing one of them.

1 out of 1 people think this is helpful.
50

Just checked we got fuel and air but no fire?

50

It will turn over but won't start. The fuel pump is working.

50

No fire to the coils?

75

crankshaft positiin sensor or ignition module become suspect

1 out of 1 people think this is helpful.

ya know...thats wrong. the relay is obviously sticking.

Not utta the question but the simple stuff first. find a forum page or maybe a fb group for these trucks. see if youca nf ind the factory service manual on pdf. new bible and better than haynes or chiltons. ill never own a vehicle wo one

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