Have Boat Questions? Ask a Boat Repair Expert.
Hello my name is ***** ***** am I speaking with?
If a bank of cylinders is not firing it can only be 3 possiblites. Bad ECM, which you ruled out. Bad wiring harness/short in the harness. Or the ECM is being put into protection mode because of a problem or faulty sensor.
Does the engine alarm system work on the engine? Does it beep every time you start it? Has a Diagnostic scan tool been hooked up to the engine?
70 to 80 is a little high, but it would not cause a bank of cylinders not to fire.
When you break the EFI system down to it's basic components it is a simple system. Think of an injector as a light bulb with 2 wires. 1 wire is positive, the other wire is negative. The injectors always have power to them, all of the time. The ECM applies ground to complete the circuit, and shut the ECM on and off. So what is done to test for a bad harness is you check for power first at the injector (and they will have it as all 8 share a common power wire, so if one was out they would all be out). And then after that use an oscilloscope or even a test light and check the injector ground wire right at the ECM. If it shows a ground signal at the ECM, but not at the injector, the harness has a break in it. If there is no ground signal at the ECM, the ECM is either bad, or it is stuck in "limp" mode. And that would need to be figured out next.
From a mechanics standpoint it's not to hard to figure out. Does that all make sense?
Are you working on this yourself?
I am here waiting on you, did you have any further questions on the issue?
If you have no fire now next step would be to hook up a diagnostic laptop to the ECM and check the parameters on the live data, or see if it will even communicate. IS that something you can do and then write down and transcribe to me?
I use Rinda Diacom, and It works very well. Click this link, this is the one. http://www.rinda.com/marine/diacommarine.htm
What you want to keep in mind is even with the Diacom, you have to know how to read it and what all of the numbers mean. It won't just say "fix this".
Of course, that is no problem, you can reply back at any time, even after doing a rating. I have Diacom as well so you can make a live recording of the data and send the file to me to read.
Did you buy the diacom or did you buy the techmate?