Hello all,
Your help in diagnosing an engine problem would be greatly appreciated.
Started while motoring the boat, it felt slightly sluggish, and I found myself giving a bit more throttle than usual. It also seemed that the engine temperature was rising faster than normal during the trip out of the marina, but the exhaust seemed to have the normal amount of water.
Then the engine died, in a "just turned off the ignition" manner. Engine wouldn't restart at that point.
Checked compression- found 110 on all cylinders.
Spark seemed good from the coil. Put on new plugs.
Emptied fuel filter.
The engine would then restart, but ran very very rough, needed a lot of throttle to keep it running at even a low rpm, and then died with a loud "ping" noise.
Since then:
Engine will start consistently, but continues to run rough, in the same manner as before. Occasionally a puff of smoke (bluish?) will come out of the blowby tube.
In addition, checked the (new) spark plugs and it seems that the plugs from 1 and 2 have a lot of carbon build up and are very dry. These cylinders, and plugs, are also very hot after running the engine for even short periods. Cylinders 3, 4 are much cooler, and the plugs when removed seem very clean, and damp with a fuel smell.
Any suggestions on which way to proceede with troubleshooting this?
The original shut down of the engine seemed to indicate electrical, but I don't know if the other symptoms are compatible with that.
Thanks so much,
Jacob
Cal 29
Your help in diagnosing an engine problem would be greatly appreciated.
Started while motoring the boat, it felt slightly sluggish, and I found myself giving a bit more throttle than usual. It also seemed that the engine temperature was rising faster than normal during the trip out of the marina, but the exhaust seemed to have the normal amount of water.
Then the engine died, in a "just turned off the ignition" manner. Engine wouldn't restart at that point.
Checked compression- found 110 on all cylinders.
Spark seemed good from the coil. Put on new plugs.
Emptied fuel filter.
The engine would then restart, but ran very very rough, needed a lot of throttle to keep it running at even a low rpm, and then died with a loud "ping" noise.
Since then:
Engine will start consistently, but continues to run rough, in the same manner as before. Occasionally a puff of smoke (bluish?) will come out of the blowby tube.
In addition, checked the (new) spark plugs and it seems that the plugs from 1 and 2 have a lot of carbon build up and are very dry. These cylinders, and plugs, are also very hot after running the engine for even short periods. Cylinders 3, 4 are much cooler, and the plugs when removed seem very clean, and damp with a fuel smell.
Any suggestions on which way to proceede with troubleshooting this?
The original shut down of the engine seemed to indicate electrical, but I don't know if the other symptoms are compatible with that.
Thanks so much,
Jacob
Cal 29
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