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  1. 3

    MEFI Tuning

    Does anyone on here have any experience with MEFI tuning (MEFI 1/2 if it matters)? Any good location for .bin files, etc.? There are some auto options, but figured I would ask here first.
  2. 3

    Remove/Bypass Heat Exhanger

    Been struggling with a coolant loss for quite some time, so I’m considering removing the heat exchanger and having it pressure tested. What’s the best way to bypass the heat exchanger and run a raw water setup while I have the heat exchanger off? I boat in freshwater, there is almost no...
  3. 3

    454 XL TBI Firing Order

    Does anyone have a source document that states what the firing order for the 454 XL TBI engines is? I believe Crusader uses a GM supplied intake manifold, and there is a firing order stamped on the intake. I just want to confirm that the firing order stamped on the intake is in fact the...
  4. 3

    Oil Pressure Sending Unit Ohms

    How can I test the Ohms output from the oil pressure sending unit? I tried grounding a multi meter, disconnecting the wire from it, and reading the post, but I did not get any discernible reading. Starboard gauge and sending unit works fine. I've ordered no less than three sending units for...
  5. 3

    454 XL Bypassing knock sensor/oil pressure switch

    I know full-well that these sensors exist for a reason, and I know full-well that the OP sending unit is different than the OP switch... That said, I'm trouble shooting an issue where the engine runs great up to 1900, revs past 1900 fine at idle (no pops backfires, etc.) but will not: 1)...
  6. 3

    454XL fuel delivery issue

    It’s not any of the three filters, or the pump, or the regulator, or the anti-siphon valve. I’ve been through all of it, and pretty fed up at this point. Anyone know if I can drill and tap an O2 sensor on the area of the crusader exhaust riser that looks like a freeze plug? (it’s just an...
  7. 3

    Crusader 454 XL Cooling issue

    454 Crusader, complete closed cooling system (only the risers and exchanger are raw water cooled). I did a valve job on the starboard engine this year. All back together, running well, but overheats after about 5 minutes. When I was disassembling the engine for the valve job, I drained an...
  8. 3

    454XL Oil Pressure Gauge Issue

    Have a gauge acting up. (Crusader 454 XLs) Grounded the sending unit wire on the stbd motor, gauge pegs, grounded the wire on the port motor, gauge goes to zero. Gauge also reads backward (reads 20 psi at idle, when it revs up, reads lower). Could the wires be reversed on the gauge, causing...
  9. 3

    Limp Mode Q

    Did a ton of work to my port motor over the winter (rebuilt the upper end, and some)... Now I can't get it to rev consistently past 1900 rpms. Runs perfect below 1,900, idles perfect, revs perfect, will rev perfectly past 1,900, but always comes back down to 1900, near instantly. 1900 seems...
  10. 3

    V-Drive Issues - Warning and Fluid...

    1) Issue 1 - port motor has a V-drive warning and I can't seem to clear it. Interested in determining how to clear the code (engine scanner doesn't show anything), and if possible, how to jump out the warning so it goes away, even artificially. I've read some conflicting information, that the...
  11. 3

    Frustrating 454 XL TBI Issue

    Chased my ass for a month last year, and figured out that the top half of my STBD TBI was not operating properly, swapped my PT TBI to the STBD motor, and it ran perfectly. I rebuilt the damn thing before I put it on the STBD motor, which already was running poorly. Over the winter I...
  12. 3

    454 XL TBI Stalling Issue

    1996, 454 Crusader TBi (low pressure model). Boat starts and runs, and I can keep it running if I pump the hell out of the gas. It will rpm up to around 2500, and bounce between 500 and 2500, but if I let go of the throttle, it stalls. If I keep the throttle forward, it will stall, same as if...
  13. 3

    1996 454 Crusader XL TBI Stalling Issue

    I have a 1996 Trojan Express. The port motor runs fine, the starboard motor ran fine, until it developed the following issue at the end of last year: Turn key to ready, fuel pump kicks on, start the motor, motor starts, runs fine, then shuts off in about 10-15 seconds. Starts back up...
  14. 3

    1996 454XL Stall Issue

    Motor starts, idles, and RPMs beautifully, but stalls intermittently. Sometimes it runs for 30 seconds, sometimes it runs for 30 minutes. It doesn't matter what RPM it's at. It can be under no load at 2k rpm and just shuts off. Doesn't sputter, doesn't hesitate, doesn't throw any codes...
  15. 3

    1996 454XL No Power (electrical)

    I have power to the 50a circuit breaker on top of the motor, power to the starter, and I can control the starter at the helm. (no key, the boat has a start button and an "ignition off" button) I also have 12v power to the 10a top ECU breaker, mounted on the motor, but I have no power to the...
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