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  1. vroom ZOOM

    Please help! 2007 optimax 150 problems

    did you change both the air and fuel injectors?
  2. vroom ZOOM

    Please help! 2007 optimax 150 problems

    plugged injector doesn't throw a code. There was a recall on the coils, see if your merc dealer can get you some free ones if you find another bad one. The service bulletin calls for all coils to be replaced.
  3. vroom ZOOM

    Please help! 2007 optimax 150 problems

    can you take a video of the fuel mist coming out of the air rail? Also unhook the TPS linkage and let the TPS fully seat down the the idle position on its own. You might try even pushing it down a little. See if this makes it run better. Also do a cylinder drop test by unplugging an injector 1...
  4. vroom ZOOM

    Please help! 2007 optimax 150 problems

    just checked my opti, it will hold 10 psi in the fuel rail for a while after turning the key to on without starting it. Check this! This can mean two things: An injector is leaking (need to service injectors anyway) bad regulator/tracker could be a worn fuel pump but then at WOT you would have...
  5. vroom ZOOM

    Please help! 2007 optimax 150 problems

    The fuel pressure video ends before fuel pressure drops off fully. The area of interest is when it goes from 10 to 0 psi. The part where it drops off from 90 to 10 psi is because the fuel pressure is dependent on the air pressure. If the air pressure drops off that fast, then the fuel pressure...
  6. vroom ZOOM

    Please help! 2007 optimax 150 problems

  7. vroom ZOOM

    Please help! 2007 optimax 150 problems

    Its not going to be super happy. You are dropping the air pressure effectively, and then there is no pressure to inject the fuel air mixture into the cylinder, so it dies. BUT, like faztbullet mentioned, get those injectors cleaned regardless. It's part of regular maintenance and may clear up...
  8. vroom ZOOM

    Please help! 2007 optimax 150 problems

    the one on the right is the fuel pressure regulator. The one on the left is the tracker valve. both have the fuel and air separated by a rubber diaphragm. either could be leaking. You could do the test I mentioned before, by pressurizing each fuel rail independently. Thankfully the tracker valve...
  9. vroom ZOOM

    Please help! 2007 optimax 150 problems

    That sounds different than mine. A little fuel fumes is ok in the air rail, but a lot is not. Basically you should not be able to see any fuel in the air rail. With the engine running, press on the air schrader valve, there should only be air. No visible fuel. Your air and fuel pressures are...
  10. vroom ZOOM

    Please help! 2007 optimax 150 problems

    link missing
  11. vroom ZOOM

    Mercury 25 HP 4 Stroke EFI Occasional Very High

    Same issue. I had this exact same thing happen on my suzuki 200😲. Well, not as bad, but it wouldn't return to idle fully, would stay around 2000 rpm in gear, if I took it out of gear then it would smack the rev limiter no problem. Two things could be going on: 1. throttle plate is hanging up...
  12. vroom ZOOM

    Please help! 2007 optimax 150 problems

    Does it idle ok if you run for 15 mins and then return to idle? There are only really two things that can cause this, a faulty TPS, or in the most common case, a weak battery/connections. Probably the latter in your case. Measure the battery voltage with the engine idling right after starting at...
  13. vroom ZOOM

    Mercury 25 HP 4 Stroke EFI Occasional Very High

    is it revving up only in neutral, or does it run the boat fast in gear as well? It will be hard, if not impossible to get out of gear if the rpms are above the rated idle rpms. Also, DO NOT put it in gear at anything above idle. You could instantly destroy the clutch dogs and gears in the lower...
  14. vroom ZOOM

    Please help! 2007 optimax 150 problems

    Not a real expert, but I have worked on opti's. is it doing this: also, what year is it, and model? some of the opti's had coil and injector recalls. Those things won't throw a code. A lot of things on an opti won't throw a code, but make it run like garbage. EDIT: just saw the year and model...
  15. vroom ZOOM

    New prop advice 2014 Bayliner 185, 3.0L

    19p 3 blade aluminum should be perfect for that boat...
  16. vroom ZOOM

    Stumped

    sounds like the shift interrupter isnt working and its pulling the y lever too far because of the force needed to take the drive out of gear...
  17. vroom ZOOM

    Yanmar Diesel Puzzle

    do both motors have separate pickups from each tank? sounds like fuel getting low in the stbd tank and one of the pickups not drawing fuel, and the other one is still getting fuel just fine...
  18. vroom ZOOM

    3.0 pistons squeaking... doesn't sound good.

    Yay! Threw the new gasket in, compression is back, and the engine sounds good!
  19. vroom ZOOM

    3.0 pistons squeaking... doesn't sound good.

    Tried to start it, but it just cranks and backfires through the carb. pulled the head and it seems like the head gasket is blown between 2 and 3. The cylinders look very good, no scratching. can anyone please tell me the fel pro part number for a 1989 mercruiser 3.0 head gasket. I wonder if the...
  20. vroom ZOOM

    3.0 pistons squeaking... doesn't sound good.

    Hello Was working on a friends boat today, after he overheated it. He didn't even know that the outdrive had an impeller. I pulled the drive apart and the impeller was NLA🙄. The pieces dropped down into the intake grate so I got lucky there. Tried to start the thing after putting the new...
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