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C4 Forced Induction/Nitrous - forums.corvetteforum.com
Hey guys, I have a bit of a mystery I am trying to wade through. A few times when I have started my 89 with the L98 I will go to back it out of driveway and as I am backing out it all of a sudden the idle drops to 4 or 5 hundred and the engine light comes on.

When I pull it back up and turn it off, it fires right up, lights out, and idles fine. If it's warmed up I have no problem, only seems to do this intermittently when cold. I retimed the engine to 6tdc and even advanced it a bit more to see if that would help, but it still throws the code once in awhile. Any ideas on what to look for?

A FB forum friend sent a testing procedure from the manual, and is this the only route to go? Thanks


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