At wide-open throttle, engine will run for approximately 5 minutes, and then just die. Like the ignition was turned off. Each additional try to run at full throttle will result in a shorter time frame before it dies.
Doesn?t appear to be fuel starvation because the fuel line bulb does not deflate, and engine will restart immediately at the turn of the key.
Engine trolls down nicely and runs at trolling speed for hours with no issues. When returning to dock, engine would die shortly after running at WOT.
Not sure if the 85 engines have the OMC S.L.O.W. feature, but this is how it seems to react, as if it did have the S.L.O.W. feature.
My sense is that it is an overheat problem. Had to limp to dock after the last outing. The next morning, on muffs, it started right up and was running smooth on all 3 cylinders.
I did a wiggle test on connections, changed the fuel line, filter, plugs, checked all electrical grounds for shorts, checked alarms for oil and overheat. Everything was good. I marked the oil level on the oil reservoir for the VRO, before going out.
Put the boat in the water and the problem repeated. The oil level barely moved in spite of what was a pretty good amount of motor usage.
Local tech say he put 10 hours into trying to find the problem. Compression was good, fuel pump good, power pack good. Says it's not electrical but suspects engine is just worn out. I think he decided he spent enough time on a 22 year old motor. I've got fuel, spark, compression. Not willing to give up on my baby yet!
Anyone seen this problem or have suggestions on what might be next steps.
Thanks guys, this site has helped me greatly in the past.
Mike
Doesn?t appear to be fuel starvation because the fuel line bulb does not deflate, and engine will restart immediately at the turn of the key.
Engine trolls down nicely and runs at trolling speed for hours with no issues. When returning to dock, engine would die shortly after running at WOT.
Not sure if the 85 engines have the OMC S.L.O.W. feature, but this is how it seems to react, as if it did have the S.L.O.W. feature.
My sense is that it is an overheat problem. Had to limp to dock after the last outing. The next morning, on muffs, it started right up and was running smooth on all 3 cylinders.
I did a wiggle test on connections, changed the fuel line, filter, plugs, checked all electrical grounds for shorts, checked alarms for oil and overheat. Everything was good. I marked the oil level on the oil reservoir for the VRO, before going out.
Put the boat in the water and the problem repeated. The oil level barely moved in spite of what was a pretty good amount of motor usage.
Local tech say he put 10 hours into trying to find the problem. Compression was good, fuel pump good, power pack good. Says it's not electrical but suspects engine is just worn out. I think he decided he spent enough time on a 22 year old motor. I've got fuel, spark, compression. Not willing to give up on my baby yet!
Anyone seen this problem or have suggestions on what might be next steps.
Thanks guys, this site has helped me greatly in the past.
Mike
