Hello, long story short my A4 is misfiring on cylinder 3:
I initially came to the boat after running great and popped on a new carb gasket. After doing this the boat wouldn't start.
After pulling off the carb ten times, I finally got the float set to not flood.
After doing this, I found that I was getting no spark, but I never touched anything related to spark.
I went down to a local marine parts store and picked up a coil that needs a resistor which I installed. Got spark back, I did notice the coil is getting hot to the touch.
I carefully traced each plug wire, they were all correct.
Now I am getting it to start but with backfiring, and rare starts, dying under a load. So I loosened the distributor and set the timing so the motor ran more smooth.
Pulled the carb off again, cleaned the internals of the main jet, spaced that one. Still not too much of a difference.
Next, I looked at the distributor cap, it was a little loose, had to jimmy rig the screws when it was in my garage. Secured tightened.
I did notice that the brass or bronze plates in the distributor cap were scored, like a small groove in them.
Looking further I noticed that the rotor was broken, there is a small groove that holds the little piece of metal on the top of the rotor, so it does not sit in its seat.
Now the engine runs better than it ever has, I mean it must idle at 100 RPM you can barely hear it.
Still, Pulled the plugs #3 cylinder plug is not showing signs of burning like the others, and a very small backfire in gear tied up at the dock.
Went to west marine, picked up the only wire set they had, it was the wrong plug wire type, but I was able to use one to try to see if the plug wire was the culprit, still no change.
I have electric ignition. My next step was going to be buying a new rotor.
Just posting this here to see if anyone has other thoughts on this.
I initially came to the boat after running great and popped on a new carb gasket. After doing this the boat wouldn't start.
After pulling off the carb ten times, I finally got the float set to not flood.
After doing this, I found that I was getting no spark, but I never touched anything related to spark.
I went down to a local marine parts store and picked up a coil that needs a resistor which I installed. Got spark back, I did notice the coil is getting hot to the touch.
I carefully traced each plug wire, they were all correct.
Now I am getting it to start but with backfiring, and rare starts, dying under a load. So I loosened the distributor and set the timing so the motor ran more smooth.
Pulled the carb off again, cleaned the internals of the main jet, spaced that one. Still not too much of a difference.
Next, I looked at the distributor cap, it was a little loose, had to jimmy rig the screws when it was in my garage. Secured tightened.
I did notice that the brass or bronze plates in the distributor cap were scored, like a small groove in them.
Looking further I noticed that the rotor was broken, there is a small groove that holds the little piece of metal on the top of the rotor, so it does not sit in its seat.
Now the engine runs better than it ever has, I mean it must idle at 100 RPM you can barely hear it.
Still, Pulled the plugs #3 cylinder plug is not showing signs of burning like the others, and a very small backfire in gear tied up at the dock.
Went to west marine, picked up the only wire set they had, it was the wrong plug wire type, but I was able to use one to try to see if the plug wire was the culprit, still no change.
I have electric ignition. My next step was going to be buying a new rotor.
Just posting this here to see if anyone has other thoughts on this.
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