Recent content by Maverick7

  1. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    Another possibly I just thought about after hours of youtube. Any thoughts on it being a bad ignition coil? I glanced at the ignition coil thats in there now. It does have a slight film of oil on it, could be from anything I suppose over the years but is it possible the ignition coil has gone bad?
  2. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    No I didnt, its just me so Im not sure how to increase the throttle at the helm and also look at whats happening in the carb. As for as the muffs question goes: I dont live on a lake and the boat doesnt live in the water. The issue started last night with the boat on the water. Tonight, I was...
  3. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    I can order the pressure gauge for $22, or I see that an OEM fuel pump is like $150, or $25 for some Chinese knockoff. I wonder if I just get the Chinese one for the same price as the inline fuel gauge. It should run for at least long enough for me to confirm or rule out the pump issue. That way...
  4. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    You were correct,at first it was only underway and only at 3000rpm. But now things have changed and it happens anytime except at idle, which it seems to run fine. Also, I dont think I have a mechanical fuel pump if thats what you were referring to, its part number 861155A3. I personally...
  5. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    Tonight was with muffs on. I ran it out of the water(muffs), and thats when it stumbled to climb rpm's with any amount of throttle. Last night was on the water. It seems strange to me that this would be a carb issue as it ran fine on the water for over 30 minutes. It was then all of a sudden...
  6. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    I cleaned the filter/screen in the carb, there wasn’t much in their. However, when I tried running it tonight it idled perfectly fine, but giving it any throttle it immediately bogged down and then stumbled its way up to rpm’s. So when throttle was increased, the rpm’s would eventually increase...
  7. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    I just want to clarify something. When I said i replaced the fuel filter, I was referring to the fuel filter/water separator (looks just like an oil filter). However, after some research I now see that there is a fuel filter/screen that is in the fuel line, where the fuel line connects to the...
  8. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    Iv never actually cleaned the carb, never thought I had a reason to honestly. Iv seen sea foam videos of them just spraying seafoam into the carb while the engine is running, followed by shutting down the engine and letting it soak for 15 minutes, followed by starting the engine and running it...
  9. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    The fuel was premium ethanol-free fuel, filled last year at winterization (October). Iv always filled the tank full before winter storage, never had an issue like this. Fuel filter was changed during winterization (October). Iv never actually cleaned the carb, never thought I had a reason to...
  10. M

    Mercruiser 4.3L - Stumbles at 3000RPM

    2004 Mercruiser 4.3L Thunderbolt V Alpha 1 Gen 2 Engine S/N: 0m670495 Crownline 180BR I took the boat out of storage today. It ran perfectly fine for about 30 minutes at varying rpms along our ride. After the first stop, we took off again and I normally like to cruise at about 3000rpm/22mph...
  11. M

    Merc 4.3L - Wiring and Idle Adjustment

    Can you fill me in more on this part (timing and adjusting idle rpm). Iv searched through the owners manual and it doesn’t get into timing/idle speed. And I can’t find anything in the adults only section other than how to find tdc, nothing on the actual adjustment. I’m more concerned with the...
  12. M

    Merc 4.3L - Wiring and Idle Adjustment

    I knew I was forgetting something…..fixed! Innova 3568, seems to everything I would need plus some.
  13. M

    Merc 4.3L - Wiring and Idle Adjustment

    2003 Mercruiser 4.3L V6 Serial #: 0m670495 Two Questions, not sure if they are related to each other which is why I am posting both questions in the same thread. 1. Can somebody tell me what the two wires I have pictured and circled in red are for? One of them is capped, the other has some...
  14. M

    What prop??? Help

    What’s on there now(pitch/make/blades)? I have a similar boat. When I bought it, it had a 3 blade 17p prop on it. It sucked, for some reason it took forever to plan out and I could only do about 30 before hitting the limiter. Switched to a 19p 3 blade, and that worked quite a bit better. Planned...
  15. M

    Throttle issue?

    I had a similar issue. RPM gauge would almost “bob” up and down at random times. On the back there is a selector switch that corresponds to the number of cylinders your engine has. Sometimes the contacts under that switch get corroded. The remedy is to just flip the switch back and forth a few...
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