The PCM automatically regulates the spark advance to fire the spark plugs according to input from various engine sensors. The input signals are then used to compute the optimum ignition timing for the lowest exhaust emissions and best driveability. Base ignition timing and all advance functions are controlled by the PCM and are not adjustable.
Is there a Check Engine light illuminated? If so, what codes are retrieved? If not then you may want to inspect timing belt/chain, also try swapping PCM with another known good PCM.
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Tuesday, April 14th, 2009 AT 10:48 PM