Mechanics

SOMETIMES STARTS SOMETIMES WONT STARTS

2001 Ford Expedition

Engine Performance problem
2001 Ford Expedition V8 Four Wheel Drive Automatic 118100 miles

sometimes starts, sometimes won't start? And works great when started. Starter sounds normal, engine tunes over fine but wont start at times?
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Adamjones
March 12, 2010.



Next time it happens-immediately do below to determine whether it's fuel or spark issue.

Cranks but no start condition: Fuel and spark
Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it

Rasmataz
Mar 13, 2010.


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