Find someone with an oscilloscope who knows how to use it. I am guessing the crank sensor signal might have slow ristetime possibly due to capacitive loading or incorrect pull-up resistor value. At low rpm the signal can still rise far enough for detection but the higher rpm signal can't get high enough to be detected. High temperature generally slows things down more. Is the pro charger heating up the area where the crank sensor is? Is the pro charger heating up the ECU?
Don
Last edited by dhutton; 08-03-2017 at 07:10 PM.
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