I just did a brake cleaner test, I unplugged the PCV hose and when the engine went to stall I shot some brake cleaner in there and it immediately picked up. I had to spray A LOT in there before it picked up. Not just a little shot, but a good steady stream! I am now certain that this engine is...
Just got the troll mode thing figured out. unfortunately that did not point me to my issue. The neutral switch just had some resistance to ground. unplugged it but nothing changed. on to the next thing.
On my running engine the pulsewidth is 3.5, and map is around 21. BUT the port engine did decide to idle today at one point, albeit very rough and borderline stalling. I did record the data though. Injector pulsewidth and MAP was at 3.5 and 21, just like on the starboard engine but it was...
Transmission
Mufflers and exhaust plumbing
shift cables
throttle cable
water pump
load anticipation switch
trans temp switch
trans harness
knock sensor
heat exchanger
longblock(inc. heads and valve cover)
analog temperature sender
analog oil pressure switch
engine mounts
Okay... so I found something else funky
yes but it will rev to almost 3k then almost stall, then catch and rev up again etc.
Any ideas about how the ecms know which engine they are on and that turns troll mode on or off even though it doesnt exist?
Also today I had to move the boat into...
Ok, as I dig through this things get super wierd.
in diacom, there is a parameter called "Troll Mode input". I disregarded it at first thinking that it was not changeable and programmed into the ECM. When I put any ECM on the running starboard engine, troll mode is "OFF" all the time. When I...
I think it is time for me to invest in an oscilloscope. I want to compare the injector voltage and current waveforms on both engines to see if the injectors are actually opening as commanded by the ECM. Also hook it up to the ecm power and ground feeds and distributor rpm signal to see what is...
Well, I just honed in on another huge clue. I ran a data log through diacom on the working engine to get some numbers. At idle, the IAC is around 17 counts and the injector pulse width is 3.4 ms. On the broken port engine, the injector pulse width is 2.5 ms, even going down to 1.8! So for some...
Well I am completely pulling my hair out. Will call the place I bought the motor from and see what they have to say. Its fair to say I have tried every single part from the other engine other than the longblock and it still wont run. I also tried removing the mufflers to see if there maybe was...
