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Rich mix black smoke mix adjustment

RIQUE
in Engine & Drivetrain

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My 280z is running rich. Is there a way to reglulate fuel mix to the engine? I see no

vacuum leaks and idle is silk smooth.

Check Thermotime, Water, etc sensors. Check to see if the Cold Start Injector is stuck open. Check the AFM (but I doubt this one). Report back what you find....

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