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Misfire Woes 700

posted by  egdeaile on  Fri Aug 8 03:15 CST 2008
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last visit: Sun Feb 1 13:36 CST 2009
[RELATED]

Hi all,

I still have a misfire that I believe to be random. I am beginning to believe it is weak spark/no spark in a random oscillating pattern. So, it wouldn't always be cylinder + 1 msifiring, but all of them at some point. I have come to this conclusion because I still have a misfire and have test each spark plug individually and checked the exhaust manifold after a few seconds of running, there are no obviously cooler outlets.

So, I have it down to the Ignition coil, the power stage amplifier, and the ICU.

I have no arcs to ground (checked engine while running at night. All other systems seem to work fine. Engine is running rich, but I believe that's because the ICU is reporting misfire, so it will not go into closed-loop operation, is this a correct assumption?

The ignition coil ohms out fine

The icu reports misfire but does not engage CEL?

The power stage I have no idea how to test... does anyone else?

Thank you all for your comments and help.

Best Regards,
E.G. Deaile

1989 Volvo 745 Turbo Wagon (Project Car)






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