H20Dog
Cadet
- Joined
- Jul 12, 2007
- Messages
- 14
Mercrusier 454 Bogs down @ 2500 RPM
I purchased a 1994 Mariah Z230 with a Mercrusier 454 EFI Mag. engine. I has run like a champ for the three years I have had it, until this summer. It would run fine but when the throttle was brought back to idle the engine would die or generally run rough then even out. I decided a tune-up was in order so I replaced the dist. cap, rotor, spark plug wires, spark plugs and fuel filter. On the next outing the motor ran great at idle (fixed the rough idle stuff) but when I went to run up the throttle to go on plane the engine appeared to lean out (at 3/4 throttle the engine suddenly just started increasing the RPMs on its own). I backed off to idle again. Now when I run up the throttle the engine bogs and won't go above 2500 RPM. Otherwise I runs great up to that point. I have a codemate for the EFI but it's not tossing any codes. Any suggestions?
I purchased a 1994 Mariah Z230 with a Mercrusier 454 EFI Mag. engine. I has run like a champ for the three years I have had it, until this summer. It would run fine but when the throttle was brought back to idle the engine would die or generally run rough then even out. I decided a tune-up was in order so I replaced the dist. cap, rotor, spark plug wires, spark plugs and fuel filter. On the next outing the motor ran great at idle (fixed the rough idle stuff) but when I went to run up the throttle to go on plane the engine appeared to lean out (at 3/4 throttle the engine suddenly just started increasing the RPMs on its own). I backed off to idle again. Now when I run up the throttle the engine bogs and won't go above 2500 RPM. Otherwise I runs great up to that point. I have a codemate for the EFI but it's not tossing any codes. Any suggestions?
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