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C.I.M.

05-06-2014 09:05 PM

500 efi running rich

I have a set of 500 Efis and one of them is using noticeably more fuel than the other. There is visually black exhaust coming out at idle. Could it be a bad sensor? Wondering where to start looking

Ted G

05-06-2014 11:30 PM

Check fuel pressure, should be right at 40 psi. Also need to measure the coolant temp sensor and see if the resistance changes as it gets warmer.

C.I.M.

05-07-2014 08:37 PM

Thanks. I had another guy tell me the exact same thing. I'll start there and see what I find.

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