Testing coils on a coil over plug system?

[buzzinhalfdozen]

Originally Posted by magnumv8

Hey Art.....I personally have had cam and crank sensor failures that caused a loss of power and the engine did not want to run unless the rpms were up.....they can fail and send a false trigger signal to the ECU......


D L Rambo....

Most modern Engine Management system only use the cam sensor @ start up to synchronize the fuel and Ign. events... most systems will continue to run correctly even if you unplug the cam sync. Now the crank sensor is a different story, yes they can be intermittent, and after reading back thru the posts I see Art's running a VR ( Variable Reluctance) sensor, this type of sensor is very sensitive to 2 things.... air gap and RFI. He could try making the gap slightly less or more and see if it effects the running. Most VR sensors run best @ .050 gap, check the resistance of the sensor, you can also hook up a DVOM set to AC volts with sensor unhooked crank engine sensor should produce about 1 volt AC while cranking.