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RHP	07-03-2021 01:53 PM

Fuel Injection Help

I have 540's running Mercury Racing 525 EFI intakes on Mercruiser MEFI 3"s

My question is, what do I need to do to convert this these to closed loop EFI? I know I need to add O2 sensors, but are the MEFI 3's capable of running closed loop?

ctuck0659

07-03-2021 11:04 PM

I'm 99% certain that no version of the MEFI 3 supports closed loop A/F

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