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Sorry Dan, that won't set a CEL.
I can't believe I haven't mentioned the obvious. Have you put fuel in the tank recently?
The Evaporative emission system will use manifold vacuum to empty gasoline vapors out of the fuel tank to burn off before they can polute. It has to maintain this vacuum for a specific time. This vacuum actually has a sensor, and if it fails the test, it will set a CEL. The most common cause for a CEL? A loose gas cap!
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Brent
Early85 944
LM6Y Paint Code
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