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TR2/3/3A TR3 dead cylinder ?
- Thread starter wltsii
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Spark plug still comes out wet, I believe with gas.
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If your plug is getting very wet with fuel, that could prevent it from firing. You might try removing it and letting the cylinder air out for a day, then try again with a dry plug and cylinder.
To be sure it's firing, you can attach a timing light with an inductive pickup (the kind where you clip it to the spark-plug wire) and see if it triggers the light. If you don't get flashing from the timing light, you definitely are not firing on that cylinder. If you do, it still could be caused by an arc to the block, but you can eliminate that by examining it running in the dark.
If you are getting fuel and spark, it has to run. Just need to find where you are losing one, probably the latter.
To be sure it's firing, you can attach a timing light with an inductive pickup (the kind where you clip it to the spark-plug wire) and see if it triggers the light. If you don't get flashing from the timing light, you definitely are not firing on that cylinder. If you do, it still could be caused by an arc to the block, but you can eliminate that by examining it running in the dark.
If you are getting fuel and spark, it has to run. Just need to find where you are losing one, probably the latter.
CJD
Yoda
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Wet plugs can be bad rings, too much fuel, or a fouled plug. Since it sounds like you have replaced the plug several times, I am still leaning towards a fuel issue.
When you pull the front air cleaner and look at the jet, is the fuel level just below the top of the jet? If too high it will run down the intake, which could send it right into the #1 intake and foul the plug.
When you pull the front air cleaner and look at the jet, is the fuel level just below the top of the jet? If too high it will run down the intake, which could send it right into the #1 intake and foul the plug.
CJD
Yoda
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The crossover tube can cause some strange anomalies with fuel and mixtures. If you have a good spark with the plug out of the engine, I cannot believe it is an ignition problem. That is, unless you have 2 of the wires crossed??
I still think there is a mixture problem, either float level, choke position, or air synch.
I still think there is a mixture problem, either float level, choke position, or air synch.
yes. hold boot off the plug end and nice spark jumping to plug. For all you fuel advocates. I took out the jet bearing assembly because I noticed some dampness around the bottom of the carb. When it's apart there are a number of seals, ( 5 I believe ) two are o rings ( used to be cork ) , two are copper washers, one is a cork beveled seal. These seals were all replaced, however , the only thing pressuring 4 of the seals, ( two on the jet assembly and one each on the upper and lower jet bearing ) is the jet gland spring. When I removed this spring and compressed it, it did not return to full length. It was rusty ( ? ) and weak. The seals prevent the fuel feed from the float bowl from by by bypassing the jet assembly and dumping into the throat of the carb. Car has always shown rich running signs on the plugs. Flooding #1 ? Ordered new springs, will let you know !
CJD
Yoda
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Well, at least you found something to give you hope!?!
Here is some conjecture, just for discussion (and I could be completely wrong). The firing order is 1-3-4-2. That means there is a long pause after #1 fires, while both intake pulses are in the rear carb and pulsing through the crossover tube. If you have any fuel accumulating in the front carb runners, it would tend to be blown forward by the crossover tube, and into the #1 runner. Then #2 fires, but it won't suck liquid fuel back up from the #1 runner that has accumulated. Finally, #1 fires again, but all that liquid fuel is drawn into that cylinder, not atomized, and quickly fouls the #1 plug.
Here is some conjecture, just for discussion (and I could be completely wrong). The firing order is 1-3-4-2. That means there is a long pause after #1 fires, while both intake pulses are in the rear carb and pulsing through the crossover tube. If you have any fuel accumulating in the front carb runners, it would tend to be blown forward by the crossover tube, and into the #1 runner. Then #2 fires, but it won't suck liquid fuel back up from the #1 runner that has accumulated. Finally, #1 fires again, but all that liquid fuel is drawn into that cylinder, not atomized, and quickly fouls the #1 plug.
Checked multiple times due to changing cap, wires, etc. All wires marked.