Captfredsr
New member
I have twin 1996 454XL-TB Crusaders with approx. 1800 hours. Tune-ups, oil, filters are on a regular schedule. Problem: Starboard engine when up to running temperature, will start, then the RPM's will fall off till it stalls and will do that several times without idling. Sometimes after several tries, it will say running. Nothing shows out of spec on the computer and mechanical vacuum read 15 inch steady when idling at 650-670 RPM. Timing set 10 BTDC, gas pump pressure is 20 LBS running and it operates upon start with 2 second prime. I can hard throttle it with excellent response. After starting cold, it runs great, it preforms excellent through all RPM ranges on the water. What I have done to correct,(all parts are Crusader purchased) replaced: Knock sensor, Gas pump Relay, Starter solenoid, Temperature sensor, MAB module and vacuum hose, distributor Mag pickup and Ignition Module, used two new electric gas pumps, gas filter base and shutoff valve, gas main supply line to tank, fresh gas 90 gallons, switched to generator gas pickup port on tank and returned to engine port, swapped TB units and ECM from port engine that ran good and no change with swapping these units. So I'm stomped. My wife and I are 71, so we need this engine to be trustworthy. We do a lot of on water local anchoring in the Barnegat bay. Local marine mechanics are impossible to get available and I did try!! Any suggestions would be appreciated.