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Carbon buildup-

On the intake valve, will reduce power and effect the air/fuel ratio. The carbon block air flow and absorbs fuel from the intake charge. I had a 760li in my bay, come in running rough and the engine light on that was caused by carbon on the valves from not being driven only 5mile trip (never warmed up).

Carbon build up on the piston- Can change the air/fuel ratio, and can actually raise the compression ratio if it is bad, causing misfires.

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