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4.3 MPI 220 hp only revs to 1800 rpm in gear-gctid819201

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    4.3 MPI 220 hp only revs to 1800 rpm in gear-gctid819201

    My 2007 bayliner deckboat with 4.3 MPI won't rev in gear past about 1800 rpm. My mechanic replaced fuel pump, water separator, safety relief valve and spark plugs but makes no difference. When we disconnect the linked throttle/shifter the engine runs fine and revs to full speed in neutral but when we shift into gear the engine will only rev to 1800 rpm. We are thinking it is a faulty sensor or switch that does not think the shifter is in gear. We checked the one switch on the shifter and it seems to be working. We are wondering if the problem is in the ECM. Any ideas? Thanks.

    #2
    It sounds like the shifter linkage is out of adjustment. Had anyone had that off before your trouble started? If you can access the repair/maintenance manual for that motor there is a well written instruction procedure for doing this adjustment.
    Bob Hawes.
    Kelowna, B.C.
    1998 Trophy 2052 WA
    4.3 Vortec, A1 G2

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