Question about 1999 Ford Explorer

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Is spark plug working on crank shaft speed

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Yes, there is a CPS (Crankshaft Position Sesnor) that signals the ECM to fire the plugs. If the engine cranks but won't start and there's no spark, it could be the CPS. Look at the tachometer while cranking the engine and see if it moves off of 0 RPM. If it doesn't, then it could be the CPS. The best way to check it is with a OBD 2 Scanner. It will give you a no crank signal code, or perhaps another code that will lead you in the right direction if it's not the CPS.

Posted on Jul 31, 2009

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