Happy Labor Day Weekend! I did everything I could think of to get ready to motor / sail from Fort Lauderdale to Miami this weekend. Yesterday morning, the engine started just fine and ran great for about on hour, then suddenly quit. I could restart the engine, but it would run very roughly at very high RPM, and not at all at low RPM, as if a cylinder or two were not firing. I tested for spark, and found good spark. I tested for fuel flow to the carb, and found good fuel flow. I'm kind of stumped. Is the carb clogged? Are valves stuck? Plug wires shot all of a sudden?
Here is some more data:
The engine was running very hot, since we were trying to make it through the bridges on time. The gauge was reading about 190. I know I have to flush the exhaust manifold, but I did make sure there was flow of water in the exhaust out the transom.
I changed the oil last week, and verified the right amount of oil was in the engine before starting it yesterday.
I filled the gas tank full with mid-grade fuel and added some MMO. There was no label at the fuel pump that mentioned ethanol, but I don't know if they do that here in Florida.
I installed new spark plugs, rotor, and distributor cap on Friday night, and verified the engine started and ran smoothly afterward. The Ignitor electronic ignition was installed last year. The coil is mounted off the engine, and I have a ballast resistor attached. At the time of failure, the temperature of the coil was 140 F. The temperature of the fuel pump was 120.
The fuel filter is about a month old, and I have a vacuum gauge installed to verify it is not clogged. The carburetor is one year old.
Any help would be appreciated.
Here is some more data:
The engine was running very hot, since we were trying to make it through the bridges on time. The gauge was reading about 190. I know I have to flush the exhaust manifold, but I did make sure there was flow of water in the exhaust out the transom.
I changed the oil last week, and verified the right amount of oil was in the engine before starting it yesterday.
I filled the gas tank full with mid-grade fuel and added some MMO. There was no label at the fuel pump that mentioned ethanol, but I don't know if they do that here in Florida.
I installed new spark plugs, rotor, and distributor cap on Friday night, and verified the engine started and ran smoothly afterward. The Ignitor electronic ignition was installed last year. The coil is mounted off the engine, and I have a ballast resistor attached. At the time of failure, the temperature of the coil was 140 F. The temperature of the fuel pump was 120.
The fuel filter is about a month old, and I have a vacuum gauge installed to verify it is not clogged. The carburetor is one year old.
Any help would be appreciated.
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