Here we go again…boat has been running so great or motor anyway. My F115 yammy doesn’t always cut off when I turn the key to off while running. I can pull the kill switch, remove the key and kill lanyard all together and it still doesn’t cut off. The only way I can stop it is if I wait it out or trim the motor up a little. Anybody have any ideas here…not a huge problem, but I wonder if it can go the other way…no starting, that would be a real problem.
My Evinrude does that too not sure if it is what car/truck engines do called “dieseling” or if it different. So not sure if it is timing, lean mixture or what.
Mike
12’ Jon boat twin 300 Verados
On the Evinrude, 'bad ground. Cutting the ignition off with the key is intended to ground out the ignition/spark (ergo, no spark to the plugs). If your motor keeps running, then it is not grounding out. I had this exact problem with my 1995 Johnson 88spl. I had some corroded connections/wires including the ground bolt on the side of my block. I had to trace it out, cut out the bad wires, and do a little rewiring. A little annoying, but, given a little persistence it was not to tough a chore.
17’ Henry O Hornet
26’ Palmer Scott
Ahhh…ok that makes sense. It doesnt seem like all the plugs are firing though. If it keeps running and I let it run for a second or two, turn the key back to the “run” position, the rpm’s pick up and more exhaust than usual; as if there were backed up, unburnt fuel/air mixture. I will definately check that out though. I have the manual, just didn’t look it up because I have so many other things to do on my boats. I appreciate the info sir!!
Mike
12’ Jon boat twin 300 Verados
my guess would be the wiring harness has corrosion in it
when it keeps runninglike that, take a screw driver handle and gently tap the ECM on the front of the engine, seen one do it before, kept running even with the battery cables disconected and no harness hooked up. Something inside the computor was back feeding voltage, ecm is powered up off the stator. took a new computor to fix it
Same wire harness you send me a few months ago and no, not a bit of corrosion. A little strange. I agree.
I hope it is not the computer. I don’t want to know what that would cost.
quote:
Originally posted by chris Vmy guess would be the wiring harness has corrosion in it
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will need to hook it up to the computer and duplicate teh problem, and see what happens