Co2 with CATs??? Cough,cough.

[jpvanwag]

I have a 2007 Supra SunSport with the 340 Monsoon CAT engine. It performs pretty well but It seems to be running rich and has an intermittent Check Engine Light. Anyone have any similar problems with their boat or any ideas on what could be wrong or how I could fix this?


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[Plum Nauti]

I'd say start with simple stuff. Check your throttle body. Ensure the butterfly valve has no build up in or around it. Check your PCV valve. Make sure It is not froze up. Always run non-ethanol fuel. Ethanol attracts moisture and can promote small bits of corrosion in the fuel system. Pull a couple spark plugs and check for fouled plugs. Honestly could be a vast array of possibilities. With the CEL light being intermittent, it sounds simple. The ECM in these boats perform much like a regular vehicle. Just not easily read by common engine scanners.