02 TG 500HP backfiring intermittently??
#1
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Location: Rolla/LOTO MO
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02 TG 500HP backfiring intermittently??
Friend of mine's boat. It will run fine all day long and then the next day it may run and just randomly start backfiring on Port side. It will just pop and Crackle and start lose rpm slowly, you can take the throttle and jacket and pump it to try to keep it running it may come back but most times it will just die. You can always get it started back up and it will idle fine and once you start to put it under load it'll start backfiring again. Then I would say after about 10 minutes of trying to keep it running all of a sudden it clears up and runs fine. So of course every time he takes it to the marina it's running fine and they can't find anything wrong with it this is been going on for three years. I thought I would try here to see if there is any ideas that could be lended.
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I just had to put a new fuel pump in, had the same symptoms.
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Lots of suggestions on here...I'd start by putting it on the scan tool to see if any codes have been thrown. I'd also probably put it on the scanner while running to see if any of the parameters are out. Finally, if nothing shows up, I'd start swapping parts with the other engine to see if the issue follows. I'd start with the coil...it's easy.
As crazy as it sounds, I'd watch the engine temp very closely. It can increase due to low water pressure, especially if he is trimmed and running shorty lowers. The engine temp will increase, but not to a point that it throws the alarm or a code. Once this happens, it causes the ECM to start adjusting. Mine was doing the same thing, with the same symptoms. One the engine cools a couple of degrees, all is good again.
As crazy as it sounds, I'd watch the engine temp very closely. It can increase due to low water pressure, especially if he is trimmed and running shorty lowers. The engine temp will increase, but not to a point that it throws the alarm or a code. Once this happens, it causes the ECM to start adjusting. Mine was doing the same thing, with the same symptoms. One the engine cools a couple of degrees, all is good again.
Last edited by jawbreakerkid; 09-03-2014 at 01:00 PM.
#10
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Had a problem like that on one of my boats also. The coil had a hair line crack and would seal or expand based on temperature or vibration. Never had a problem while trying to run engines on trailer but for some reason while underway and when it felt like it would happen. Try running the engine when dark and engine is hot look for electric spark leaks plug wires could also show sparks.