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    Strange voltage issue on 2007 135 optimax???

    Sorry. With the motor running I get 14+ at the battery and alternator. With the motor off, I get 12.7. That system seems to be performing correctly but for some reason it seems like the ecm is only getting around 12.6-12.7 while running
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    Strange voltage issue on 2007 135 optimax???

    Hey guys and gals I’ve posted on here before so please refer to that thread for more detailed backstory. Long story short, I blew my original powerhead about a year and a half ago and got it replaced with a fully dressed powerhead but I’m still using my old ecm. Ever since the new powerhead was...
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    Please help! 2007 optimax 150 problems

    Hey i know it’s been a while. I think I’m making some progress. I’ve now replaced three coils. It runs a lot better all around. Still have a slight cough at idle and doing a drop test the cough is still there with any of the cylinders unplugged so I think it’s something that’s affecting the...
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    Please help! 2007 optimax 150 problems

    Also since it’s not the original powerhead the serial number on the transom bracket isn’t the correct one. I’m having trouble finding a serial number on the actual powerhead
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    Please help! 2007 optimax 150 problems

    I just ran the boat with a new coil on cylinder 1. Ran MUCH better. Still a little rough at idle though but gained some top end rpm and felt like it just had a lot more get up and go. I think the cylinder 1coil was totally shot and there might be another coil on its way out. Do you know how to...
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    Please help! 2007 optimax 150 problems

    So I did a drop test on injectors and coils. Cylinder 1 didn’t change much when I disconnected the injector. Swapped 1 and 2 injectors and it still didn’t change much when I disconnected cylinder 1 injector. I then disconnected coils and cylinder 1 coil didn’t really change how it was running at...
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    Please help! 2007 optimax 150 problems

    The only place I can run the motor is on the water and I’m going to be on the water a lot this weekend so if you can think of anything I should test please let me know. I got the reading of the pressure in my garage and it held steady at 10psi. Maybe after I run it the diaphragm heats up and...
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    Please help! 2007 optimax 150 problems

    Actually no reason for a video. Just tested the pressure again and it held right at 10 for several minutes. The needle never moved at all and I eventually just unhooked it
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    Please help! 2007 optimax 150 problems

    I’ll get a better video of that here in a little bit. What would you consider a while? And would it be a leaking air or fuel injector?
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    Please help! 2007 optimax 150 problems

    Thanks I was wondering about that. I also thought it was strange how fast the pressure drops after the high pressure pump shuts off when turning the key. At the very end of the video
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    Please help! 2007 optimax 150 problems

    By the way as soon as I press the air schrader valve the engine dies. Should I be able to press the valve and the motor will keep running?
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    Please help! 2007 optimax 150 problems

    The plugs all look the same to me ever since fixing the bad coil I had.
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    Please help! 2007 optimax 150 problems

    Thanks a lot. Here are videos of the air and fuel pressures. Do they look right to you?
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    Please help! 2007 optimax 150 problems

    Thanks for the help! My particular engine doesn’t have the normal air pressure regulator. I think mine is the version 2 or something like that. It doesn’t have the diaphragm or spring like the fuel regulator or tracker valve. I have the fuel and air regulators on the port rail and the tracker...
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    Please help! 2007 optimax 150 problems

    I should give you some more information. I put new plugs in it. Checked the tracker diaphragm and fuel regulator diaphragm. I didn’t see any tears or holes in the diaphragms but the fuel regulator diaphragm was a little deformed. I checked air/fuel pressures and they looked to be right on at...
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    Please help! 2007 optimax 150 problems

    Sorry. Here is the video
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    Please help! 2007 optimax 150 problems

    Here is the link. No it always idles bad. I’ve measured the voltage. What’s it’s supposed to be? I thought I had the issue narrowed down to one of the diaphragms in the fuel rail
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    Please help! 2007 optimax 150 problems

    Here is the link. No it always idles bad. I’ve measured the voltage. What’s it’s supposed to be? I thought I had the issue narrowed down to one of the diaphragms in the fuel rail
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    Please help! 2007 optimax 150 problems

    It’s doing something similar. Yes 2007 150. I already replaced one coil which was causing surging through the higher rpms. It still idles really rough though but runs fine when I give it a little gas. Was your issue a coil? Here’s how mine idles
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    Please help! 2007 optimax 150 problems

    Hey guys. I’m looking for an experienced optimax expert that can help me diagnose my rough idle problem. I’m willing to pay. Long story short I got a reman powerhead from mercury put on earlier this year. Ever since I’ve had a problem with it idling really rough. Can someone please walk through...
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