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  1. alldodge

    '99 MerCruiser MPI surging question

    Being a 310 its a 7.4 MPI, thanks for the serial number Need to get a scanner on the motor to see what the IAC, TPS and MAP show during the surging. Check fuel pressure to see if its a 43 psi running. Then remove the vacuum line and see if it goes up a tad
  2. alldodge

    RPM issues can't get up to full speed

    It takes next to no gas to rev in neutral, takes a lot under load If the gauge is accurate then pressure is a tad high but only 5 psi. Spec shows GXI C thru G to be 50 to 60 psi. Was it 65 psi when on the water and under load? If new problem and you have not replaced the distributor cap, do...
  3. alldodge

    B3 Prop pitch recommendation needed please

    Load the boat as you would normally, then see if it will reach close to or at 5200 RPM at WOT
  4. alldodge

    Mercury EFI Flash Proplem

    Don't know of a shop which can reflash a 555ECM (They are locked). Not knowing your serial number but looking at others, I can see where the ECM can be replaced with a 60hp. What is the part number on the back of the ECM? https://www.mercruiserparts.com/bam/subassembly/28108/6993/35
  5. alldodge

    2012 mercury 90hp efi 4 stroke lower unit

    Ask a Mod to move this to the OB section, would get more input Look your motor up and see what parts. https://www.mercruiserparts.com/4-stroke-efi
  6. alldodge

    '91 Doral Prestancia 300 Steering frozen - Help!

    Were not able to see what the issues are but your mechanic might be correct. It may be possible to re-route the cable but the bend radius must not be increased in most cases
  7. alldodge

    Shift Interrupter

    Maybe but maybe not. In Fwd there is more load on the prop because the way the blades are shaped
  8. alldodge

    Mercruiser 3.0 runs strong for 45 minutes then loses power??

    Yes I'm thinking carb problems. A mechanical fuel pump won't work good for a while then start messing up and go back to ok later. Might start flooding
  9. alldodge

    Battery Switch question

    Yes Unless you install a ACR, then don't worry about it
  10. alldodge

    Battery Switch question

    Yes
  11. alldodge

    Mercury instrument install

    Many time you have to remove the grommet
  12. alldodge

    Battery Switch question

    Your Bat switch is not wired correctly
  13. alldodge

    454 bogging and misfire under load

    The heat may have just warp a valve, so maybe a valve job would fix. Right now don't know so need some testing
  14. alldodge

    454 bogging and misfire under load

    Yes I think its internal. Boat ran fine before over heating. Need to test to find out. The leak down test will tell a lot
  15. alldodge

    What do I do to solve this problem

    Wasn't made for your boat Need a welder Cut the pipe, adjust and reweld
  16. alldodge

    454 bogging and misfire under load

    If you do a leak down test, you can find out if its bad valves, rings, gasket
  17. alldodge

    454 bogging and misfire under load

    Cap looks ok but compression number s don't. The lowest number should be within 10% of the highest. Even if the 150 is removed and use 145, this says lowest should be no less then 130.5 Yes, I'm thinking head gasket. Most likely when the motor heats up, the pressure gets less. Check the oil...
  18. alldodge

    SHALLOW WATER

    You want a OB with a aluminum prop. Could also install a prop guard if its real bad
  19. alldodge

    454 bogging and misfire under load

    What are the numbers?
  20. alldodge

    stuck 3000 rpm max

    High octane gas produces more performance "only" in a high compression motor. To use it in a motor that will run fine with 87 the motor has less hp. Low octane burns faster We need something to indicate how the motor is running. A bigger carb will not produce more hp. You need a fuel mix of 12...
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