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How do you find the reason a f 150 wont crank when it has comp fuel and spark?
Wiki User
∙ 12y ago
Does the fuel smell like varnish? Remove it and get new gas. Remove air flow sensor connector.Try engine starting fluid. No! After trying to crank up - remove and inspect the condition of the #1 cylinder spark plug. Now go find out how to tell what your engine is doing at: http://www.mopar.com/m_maint_inspection_plugs_tune.HTML
Connect the spark plug to the ignition wire. Add a battery jumper cable connected to the metal body of the spark plug the other end to the truck body metal or engine. Put your finger on the open plug hole and have someone crank over the motor. Watch the business end of the spark plug. It should spark at the same time the engine blows your finger out of the spark plug hole.
ANOTHER ANSWER
From your description it's safe to assume that the starter is turning the engine but the engine is not engaging. If that's not correct, the following makes no sense.
If you're certain that the engine has compression, fuel and spark, next make certain that the spark is strong AT THE PLUGS. Also, it's very possible that the ignition timing is not correct.
If the engine has spark, compression and fuel, all delivered properly and in the proper amounts, the engine WILL run when you engage the starter.
A good answer and I should have asked if the starter is turning and what is COMP fuel also. If the spark is occurring close to the pressure blowing the finger out after sucking it in then the timing is close. If it was firing it should backfire sometime. I bet there is a fuel problem.
Wiki User
∙ 12y ago
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