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Recent content by 390Express

  1. 3

    Crusader 454 gas engine

    Could be a 1,000,000 things; best to rule out fuel first, IMO.
  2. 3

    Starboard on my 97 454 Boggs down exactly at 1900 rpm when underway .

    I'm chasing the same damn problem. Runs perfect right up to 1,900, then shits the bed. There is a safety mechanism that I am told limits the fuel pump (some say that it limits the injector impedance) that comes on right at 2k. I believe that's my/our issue, but I'm not sure how to bypass it. I...
  3. 3

    Hoping for a little help on a Crusader 454XL

    1997 should be EFI, my 1996 is TBI.
  4. 3

    Hoping for a little help on a Crusader 454XL

    I'm chasing the same damn problem. Runs perfect right up to 1,900, then shits the bed. There is a safety mechanism that I am told limits the fuel pump (some say that it limits the injector impedance) that comes on right at 2k. I believe that's my/our issue, but I'm not sure how to bypass it...
  5. 3

    Bertram 302 Engine to 347 Stroker (350)

    It would be impossible for anyone but the owner to know current fuel consumption. You could try to buy flowscan meters and install them prior to a lengthy test drive... But for the most part, hull/cruise/prop/carb will have a much bigger affect on fuel economy than the cui of the engine. If...
  6. 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.
  7. 3

    Crusader throttle body fuel injection

    I can say for certain that the IAC and TPS is nothing more than a GM TBI sensor. I have installed both, both worked perfectly, and neither has been an issue. The same is true for the coolant temp sensor. The MAP sensor may be a different story, (I have not confirmed that the auto MAP and...
  8. 3

    Ignition parts for 1990 Crusader 454

    Mako, I was under the impression that on a Delco EST setup, the ECU takes over off-idle, and adjusts timing itself thereafter. It sounds like you are saying that the Delco EST setup, with a MEFI ECU may adjust timing up and down thereafter, but it is always dependent on the initial timing. Can...
  9. 3

    454xl backfire through exhaust

    How's your project coming, do you have a set of heads yet?
  10. 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...
  11. 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...
  12. 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...
  13. 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)...
  14. 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...
  15. 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...
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