Search results

  1. I

    Mercruiser 5.0 MPI #3 cylinder ignition miss

    Do you know how long it had been since plugs, wires, distributor cap, and rotor have been changed? Probably want to do it all if you don't know. Inspect the plugs to determine running condition
  2. I

    water in all 4 cylinders

    Manifold gasket or head gasket. Compression test, if good, will rule out head gasket
  3. I

    5.7 omc stalling while shifting

    This is correct. I was thinking backwards but the lobe breaks the contacts and makes the gap. Been a minute since I did points
  4. I

    5.7 omc stalling while shifting

    When the cam lobe is contacting the breaker point there is no gap. The gap is when the contact point is between the lobes
  5. I

    Can only suck out 3 liters of oil from 4.3tks

    Is it possible the dipstick has been replaced with the wrong one which is longer and reads full at a lower oil level in the pan?
  6. I

    Idles great / misses when throttled up

    Did you figure why you lost spark? I suspect it's the same reason you have a misfire
  7. I

    Fuel pump not working

    Ok, so like Augoose said, follow the wiring back from the pump. It might be pretty tough without a diagram but you should be able to find a relay or solenoid to test. Also make sure the oil pressure switch is working. And make sure you are getting power out of the alternator
  8. I

    Fuel pump not working

    At least let us know if it's carbureted, throttle body injected, or port injected.
  9. I

    Fuel pump not working

    If you can get the serial number of your engine, it will help greatly. Many people on here more knowledgeable and with access to wiring diagrams that can give you troubleshooting advice
  10. I

    Idles great / misses when throttled up

    Have you done a compression test? A valve slightly out of adjustment can reduce compression enough to cause a miss
  11. I

    89 4.3 OMC cobra stalling at WOT

    Remove the thermostat and put it in a pot of water on the stove with a thermometer. See at what temp it opens
  12. I

    Idles great / misses when throttled up

    Also what kind of cam? Roller or flat tappet? If flat tappet, did you use good oil with zinc to break it in? If not, could have rounded a lobe
  13. I

    Idles great / misses when throttled up

    What are your initial timing and full advance numbers? TB modules can go bad, especially aftermarket ones.
  14. I

    Motor has power, won’t turn over

    I have done this my whole life and never stripped one out. But I'm not recommending it for unseizing a stuck engine but simply to determine if it is seized or if it rotates
  15. I

    1986 Omc Sterndrive no spark

    Like Bondo said, put in a new set of points and condenser. They are under the distributor cap. If you haven't done points before, they are a little different. 10V on coil is probably fine because there is a resistor or resistor wire
  16. I

    Surging / losing rpm

    This is his thread.
  17. I

    Idles great / misses when throttled up

    You need to put a timing light on it. preferably an advance timing light so you can see not only the initial timing but the full advance as well. need details on engine setup. Vortec or not? Carb, I assume but which one? What kind of ignition? Points? Thunderbolt?
  18. I

    No power to start the boat

    Check your ignition switch. wiggle the key in it when turned on and see if it causes weird stuff to happen. Also make sure the shifter is in neutral fully. Wiggle it while in neutral as well. could be a neutral safety switch although that doesnt explain why it died while running
  19. I

    No power to start the boat

    First, some terminology. Turning over and cranking are the same thing and do not mean a running engine. Ignition refers to the sparking of the plugs not just turning the key on. So when you say all power is lost to the ignition do you mean you are losing spark or when you turn the key nothing...
  20. I

    Is it safe to use oxyacetylene torch on transom bolts?

    With all that fiberglass, you are asking for a fire. Can you use an air chisel?
Top