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Re: Absolutely... (archive)

[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]

Posted by Charlie on January 29, 2001 at 14:49:35:

In Reply to: Absolutely... posted by funfer on January 29, 2001 at 06:40:28:

Thanks, guys! I really appreciate it.

Charlie

In a conventional ignition set-up, you are correct in that there would still be spark at the plugs if the coil is still good. However, these ignition systems have electronic spark control....which means that if the motronic control unit does not receive a signal from the crank referrence sonsor, it has no idea where the engine has cycled for such a spark....and the coil will not receive its charge to be sent to the distributor. In short the ecu monitors the spark, fuel, and air. Ahhh, the beauty of fuel injection and total engine management!
Question: Would that affect it from getting spark to the spark plugs? I checked the distributor cap wire coming out of the coil, and there's no spark at all. Would the crank sensor restrict it from getting spark?


....but the crank position referrence sensor sounds like a better bet. Usually, even with a coil going bad the car will still run, albeit like doodoo. The sensor is what I'd check next.


Can anybody help with a no-start? Checked relays, they're good. Checked fuel pumps, there good. Checked spark at the spark plugs, no good. Is safe to say that it's a bad coil? Or can a bad Motronics also be the cause for it to not give out spark?

Thanks,

Charlie

Any help will be greatly appreciated.






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