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  1. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    Well that does change things. Was this on the muffs or in the water and underway (i.e. under a load)? Do you own a fuel pressure gauge? If not time to buy one. Something like this: link That way you can put in line and monitor as part of the troubleshooting. And also see Scott's post 10...
  2. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    Forgot to mention > the plugs look fine.
  3. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    I would think that water in fuel would cause stumbling at any / various RPMs, no? Since only at 3k and intermittent is why I came out of left field that something seems, well, out of balance at that specific RPM Trying to continue to learn so I can help… thanks.
  4. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    Checking / replacing filters should be part of yearly maintenance including this one If this filter was clogged you would have issues at more than just 3k If u are not comfortable rebuilding the carb which, I think is the next step, you can look into getting a rebuilt or new carb as it’s...
  5. ESGWheel

    Rough idle and dies when put in gear

    And the other questions please incl bondo’s Thx
  6. ESGWheel

    Rough idle and dies when put in gear

    From the limited info it sounds like you are occasionally running on less than 8 cylinders which could easily be ign. related (example: spark wire shorting out). So need more info like: Conditions under which is runs rough like cold or warmed up What RPM are you seeing when idling rough What...
  7. ESGWheel

    Mercruiser 4.3L - Stumbles at 3000RPM

    In addition to the above something else to consider is making sure the entire air pathway is clear and free to flow. Here is the thinking: an internal combustion engine is really an air pump. Problematic air flow dynamics can come into play at one RPM but not another. In a boat motor, that is...
  8. ESGWheel

    previously posted about intake manifold backfire in my 1996 Volvo Penta 5.8L ford 351 Winsor. Having a complete engine rebuilt. Heads rebuilt twice.

    It requires a tool (about $100, link) and an air compressor. If you do not have a compressor would be best to take it somewhere to do this. But if u do, even a smallish pancake compressor used for nail guns would work. Do u have one? Also, the results can be a little tricky to interpret. The...
  9. ESGWheel

    Starter Not Engaging

    I get what you are hoping for, but I can only offer a logical troubleshooting guide. While new ensure the battery is fully charged. Make sure all battery and starter connections are clean and tight. This means removing them and using a wire brush, etc. to all nice and bright. And it includes...
  10. ESGWheel

    Mercruiser 120 poor starting

    The test he conducted was to look for a squirt of the accelerator pump post cranking the engine, and he saw none. Hence the next step of validating getting fuel to the carb and then he took it to the next step to pull off the top. It’s been decades since I have been on the inside of a carb so I...
  11. ESGWheel

    Mercruiser 120 poor starting

    Boy I am exercising my memory cells now. The Power Piston No. 33 in the picture is meant to be ‘floating’ and not locked in. It’s a device that will move up and down in response to differential air pressure vs. the spring pressure. It’s used to enrich the fuel mixture under load. So, it does not...
  12. ESGWheel

    Mercruiser 120 poor starting

    Great! You are getting gas to the carb! But looks like the carb is not filling up. The fuel level seems too low. See my blown-up picture of your picture. Note the Accelerator Pump bowl gets fed with the slot down the side of the bowl. I would expect the level to be somewhere around the line I...
  13. ESGWheel

    5.0 GXi-J fuel pump relay keeps tripping

    I have been delayed de-winterizing my boat due to medical issues. I hope to get to it in the next couple of weeks…
  14. ESGWheel

    Mercruiser 120 poor starting

    Please make sure you ground out the wire from the coil to the distributor when doing test 1 or even better remove the + wire to the coil. Matching the gaskets was the right think to do. More: Also please get a can of Starter Fluid when you can, not sure if available in your area but it’s a can...
  15. ESGWheel

    Mercruiser 120 poor starting

    Thanks for the follow up and explanation. In spite of other potential issues, suggest focus on the fuel issue until 100% resolved. For your statement “I have redone the fuel test and it’s not getting to the carb now” what exactly does that mean? Let me explain what I am driving at / info that...
  16. ESGWheel

    Mercruiser 120 poor starting

    Guffer, I know this must be very frustrating for you and while I do believe you will ultimately get this running, I have to be frank and suggest that your approach seems to jump around. We started off with what was perceived as lack of fuel to the carb and I am usure if that has been truly...
  17. ESGWheel

    Wiring Question - Trim pump unit seems bad 2007 5.7 SX-A

    Here is a site (link) that explains how these systems work electrically plus some troubleshooting tips.
  18. ESGWheel

    previously posted about intake manifold backfire in my 1996 Volvo Penta 5.8L ford 351 Winsor. Having a complete engine rebuilt. Heads rebuilt twice.

    My suggestion is to perform a leak down test. Start with No. 8 but work it thru all the cylinders. Post results.
  19. ESGWheel

    in a pinch with a 5.7 Volvo Penta

    i cannot tell fm the picture, others may be able to. As i recall the top connection is the intake so need to follow it to ensure that is what it is..... @kenny nunez @Lou C can u tell fm the pic is hose connection (inlet / outlet) correct? thx
  20. ESGWheel

    What steering fluid and tilt fluid do I use?

    Your best bet is to call them. In their info you posted they claim to have top notch technical staff and years of experience. They should be able to help. For the trim fluid, if you had them rebuild that as well, then same question to them. If still OEM, then follow OEM recommendation. For VP...
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