Search results

  1. B

    Bizarre IAC reading

    Yeah, 40 knots per GPS. Speedo doesn't work....some debris got into the pickup hole on the drive and I haven't been able to unclog it.
  2. B

    Screeching Noise from Frankenstein 383

    I think I would agree....very similar sounds in thise videos.
  3. B

    Screeching Noise from Frankenstein 383

    To me it kind of sounds like something is being squeezed through a small opening under high pressure. The sounds makes me think of operating a hydraulic piston like on a backhoe...the high pressure hydraulic fluid flowing into the cylinder through the control lever can sometimes make a...
  4. B

    Bizarre IAC reading

    To my knowledge, there's been no reprop done. Original 24P props....I believe. When I did the shakedown cruise, I did go WOT and hit 40 knots. This is how it's been since I bought the boat back in 2020 with 168 hrs (now 358 hrs). Granted I never took note of RPMs at WOT, but I've always done...
  5. B

    Bizarre IAC reading

    Thanks for the additional insight. It's the ECM-555. All the boat info is in my signature, but I think there have been issues with it displaying....2005 Chaparral 256 SSi - MX 6.2 MPI s/n 0W061713, Bravo 3 With regards to #3, if I were down a cylinder or 2, would I be able to hit max speed...
  6. B

    Bizarre IAC reading

    I think I would agree. Took the boat out for a shakedown cruise. It ran great. At least I have a baseline. Thanks for all the insight.
  7. B

    Bizarre IAC reading

    What you say makes sense, but if the IAC is fully open, why is it idling at the normal expected RPM value.... 600 some RPMs? I would expect higher RPMs/high idle. Also, then, why is the IAC being commanded to be fully open?
  8. B

    Bizarre IAC reading

    Yeah, I don't have sensors installed on the exhaust paths. I wonder if I could add them provided the wires/connectors are on the harness. The engine was running on muffs.
  9. B

    Bizarre IAC reading

    Now that all my fuel pressure and module fun is over, I decided to quick plug in the computer to see what all the parameters are. Idle is normal but my IAC is at 99.98%. I just realized the one screen shot of the parameters shows IAC at 0%. It was at 99.985... I swear :oops: I also finally...
  10. B

    High Fuel Pressure

    Finally got everything cleaned up and put back together, pulled a new vacuum line down to the regulator just for the sake of having a new line. Fired it up and the fuel pressure at idle is right where it needs to be. The engine also just sounds better/stronger at idle. Thanks for the all the...
  11. B

    Cool Fuel Gen 3 Module Sea Water Connection

    Thanks for the help. Bought the new assembly and got it installed. Not as bad as I thought it would be. The trickiest part was getting that little stub of hose on the 3rd bard to disconnect and reconnect to that check valve off the exhaust manifold.
  12. B

    Cool Fuel Gen 3 Module Sea Water Connection

    For some reason the Merc parts catalog doesn't show the "Cool Fuel System" node for my serial number 0W061713. I can see it under the 5.0L MPI Alpha/Bravo, serial 1A300000 to 1A611927. I did confirm, I have the 3 nipple version. I gave up trying to find just the plastic fitting and ordered the...
  13. B

    Cool Fuel Gen 3 Module Sea Water Connection

    That's what I'm wondering....do I need to buy the whole assembly? I can't find anyone who just sells the plastic connector. I would need the 3 nipple version of that fitting. Could I just buy the whole assembly and cut the hoses to the bracket/connector and tie them in to the existing hoses...
  14. B

    Cool Fuel Gen 3 Module Sea Water Connection

    Sort of hijacking my own thread....same topic but slightly different problem. Anyone know where to buy a new plastic fitting as shown in the pic in the original post? Worst case I guess I could buy the whole new assembly. Could I just cut off the so called end with some of the hose (circled in...
  15. B

    Cool Fuel 3 Module Water Channels

    How do you determine when it's time to replace the CF3 module? Looking in through the water inlet/outlet holes, I see corrosion in there but without seeing what a new module looks like, hard to determine the level of blockage. Does the water jacket/passages in the module surround the two fuel...
  16. B

    High Fuel Pressure

    Got the fuel module out minus a little slice on the finger. While tugging and wiggling, somehow my finger slipped off and I think hit a hose clamp and did a number on the index finger. Is there a way to get pictures attached to this post because it will tell the story better. Examining the...
  17. B

    High Fuel Pressure

    Any special tricks to pull the fuel line out of the top cover? The pin screw is removed and the line does wiggle but it's not coming out.
  18. B

    High Fuel Pressure

    Do I have to worry about priming the pump once it's put back on the engine?
  19. B

    High Fuel Pressure

    I guess I will figure out, but is it best to remove the fuel module by unbolting the brackets from the engine block or unbolting the module from the brackets. The side bolts are simple to get to, just not sure yet about the bolts on the back of the module.
  20. B

    High Fuel Pressure

    I popped the regulator off the rail, it was clean.
Top