Crank no start issue

2000 MERCURY MARQUIS

77,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC

HENRY TUBBS

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Car cranks will not start. No engine light, code reader shows nothing, no fuel pressure. Changed fuel pump did not help at all. Changed PCM did not help.

Nov 3, 2018 at 10:57 AM

STRAILER

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Hello,

It sounds like you have a PCM relay that is not working. Here is a guide to help you test it and the engine wiring diagrams so you can see how the system works along with the location of the relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Cheers, Ken

Images (Click to enlarge)

Nov 4, 2018 at 11:52 AM