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    MerCruiser 7.4 MPI (1998) - Won’t Rev Past 3000 RPM - Looking for Ideas

    Thank you again for your repsponse. IT was a calm weekend so i did some tests under load. Same pressure like in idle, Just at 29.000 30.000 RPM it stops.
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    MerCruiser 7.4 MPI (1998) - Won’t Rev Past 3000 RPM - Looking for Ideas

    Thank you for the response. Yes, it’s a new-to-me boat. I checked the fuel pressure at the rail. At idle it’s around 40 PSI. In neutral, the engine revs up to about 5000 RPM, and the fuel pressure stays fairly steady at around 37 PSI. The problem only occurs under load. Once the boat is in...
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    MerCruiser 7.4 MPI (1998) - Won’t Rev Past 3000 RPM - Looking for Ideas

    I’m hoping someone has run into this before. I have a 1998 MerCruiser 7.4 MPI that runs and idles fine, but it will not rev past about 3000 RPM under load. It feels like it hits a wall and just won’t make any more power. Here’s what I’ve checked so far: Initially had fault codes for: TPS...
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