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66cal912 66cal912 is offline
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Join Date: Feb 2001
Location: San Juan, CA, USA
Posts: 148
My '79 930 does the slight dieseling on shut down too, after its warmed up. I don't think its anything to worry about, I think its just residuals being used up and a delay between turning off the key and the ignition using its last bit of energy thats between the coil, CDI box and plugs.

I always kind of think it's like the car doesnt want to shut down, cause its ready to blast around some more on boost, like a kid that doesnt want to go to bed yet..on a school night. haha

The slight dieseling, doesnt seem like a used up 1970's Detroit iron bigblock dieseling on low octane fuel, that doesn't seem healthy, its more like I mentioned above, that it's residual spark and fuel being used up, after the key is turned off. But just my observation and opinion, someone else may have a more definite answer, if they put the time into figuring out the exact cause.
Old 04-05-2013, 07:21 AM
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