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787 RFI low power
- Thread starter mattrourke
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mattrourke
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Yep, put inline testers on and it was getting spark the when time. I couldn't get a get look at the spark testers while on the water, but with new plugs, wires, a good coil and ECM from the other machine spark should be good.Same as mine. Did you every get spark test light and see if both plugs are getting a signal to spark. Mine getting a single to spark plug on both cylinders all the time.
mattrourke
Member
Tomorrow I will get a scope and take pictures of the cylinders. I will do a top end or even a full engine replacement if needed but I don't want to do that just to find out there is something else causing the issues. Are there exhaust related things I should be looking at to see if that is causing low power?
mattrourke
Member
From what I can feel it is a solid pipe and can't collapse.I have heard of exhaust tube going back to water box that runs along fuel tank collapsing causing a restriction. The 04/05 have a different setup looking at parts diagram.
I think the 04 have metal tube that goes down to water box and that pipe can get damaged from freezing maybe. I am not really sure to be honest. The 05 do not have the pipe but a muffler after manifold then a tube with nothing in it down to water box. I have not taken apart just going off parts diagram. When I look down side off tank where exhaust goes there is a long rubber tube before water box.
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mattrourke
Member
I can start pulling exhaust parts but does anyone know of any visible external cues that would imply problems? I don't see any water or exhaust leaks. But if there is something I need to pull, I will. I'm close to just buying a new top end or entire engine but would hate to put it in to find some issue plagues the new motor too.
The exhaust is probably not the problem is my guess. I believe if not circulate correctly you will see problems very quickly. But you are getting into that area I am not sure were to look next but your problem seem different than with my 3d. With lower compression and compression tester is correct does point that way a little more than electrical. But I am no expert at all just throwing idea out and hopefully learning something from comments.
mattrourke
Member
Yeah, the two boxes I attached pictures of, the ECM and the vcm or whatever it is I swapped over from the good machine and saw no difference in either machine when lake testing. It makes me fairly certain it is not electrical issue unless there is a sensor somewhere that could be causing an issue.So you did switch Ecu and vcm from working 3d?
mattrourke
Member
I swapped my coils between the two machines with no change.
mattrourke
Member
The manual says that water inside expansion pipe can cause lack of performance. It looks like a pain to remove it to check it.
mattrourke
Member
Yep. No problem. It's 230 here now I can check at 5.Would you mind testing yours if easy to get at to see what your good coil says for ohm.
mattrourke
Member
How were you testing it? I've never tested one before ebut I have a good multi meter.Would you mind testing yours if easy to get at to see what your good coil says for ohm.
It says in the manual but basically just unplug the 3 wire connection and use ohm meter centre pin to outside pins then centre pin to other side on coil. Both side read the same on mine and my multi meter is not a real good one. Should read 0.3-0.6ohm mine is reading 1.1ohm. Ya taking that pipe off would not be a fun job.
mattrourke
Member
Ok sounds good. I will pull up the manual and run some tests and get you the numbers.
mattrourke
Member
Center pin to left pin gives me 0.4, center pin to right pin gives me 0.4 and then left to right gives me 0.9.
Sounds good I never did left to right pin but my centre to left and centre to right pin was 1.1 so this coil might be my problem your coil test good right were it suppose to be. I might have 2005 3d ecu for sale if coil fixes it. Thanks again big help. What is your compression test on 3d that is running good.
mattrourke
Member
Compression on the one running good is 150. I bought a new Klein scope today that syncs to my phone but it's not charged yet. Once it charges I will scope the cylinder. I have a local company trying to find me a rebuilt engine just in case. At this point, that may be the quickest way to get on the water.Sounds good I never did left to right pin but my centre to left and centre to right pin was 1.1 so this coil might be my problem your coil test good right were it suppose to be. I might have 2005 3d ecu for sale if coil fixes it. Thanks again big help. What is your compression test on 3d that is running good.
I know what you mean. Where I live we only have a so many days of good weather and I have missed a lot already. The thing that fooled me was my 3d ran so good the first day of use of the year. Been chasing stuff ever since and testing so many things. Not sure what made we decide to test coil today even though I got a Ecu coming. My spark plugs sparked great against block and with inline spark tester I just figured coil must be good. Still might not be the problem. But on the look for a coil now as quick as possible.
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