W113 Pagoda SL Group > Drive train, fuel, suspension, steering & brakes
Intermitant firing of Cylindar
johnm:
I had a cylinder go dead on me while I was driving. (One closest to the firewall). I thought it may have been the fouled plug again but this time not the case. When I began to pull the spark plug wire and could hear the spark the cylinder came to life. But then when I installed the spark plug wire completely it went dead again. I tried it a few times with the same result. I traded wires with one I know was working OK and the same thing happened on the same cylinder. I would appreciate some help as to what may be happening. Thanks very much
Pawel66:
But have you replaced that spark plug finally?
johnm:
No about to order some new plugs but up to now have just been cleaning the fouling off it.
Pawel66:
I have never heard about anything like this (but I did not hear a lot, really), but from your desciption it sounds like something is wrong with the connector on the plug or inside the plug. If you swap the plug, you will confirm if it is a plug.
I saw many times plug connector on the lead faulty, but you say you swapped the leads and the effect stayed.
ja17:
Removing a plug wire while the engine is running, actually increases the intensity of the spark, just like increasing spark plug gap. In some cases a fouling plug can temporarily be cleaned and come back to life. Check to make sure the transmission diaphragm is not ruptured. If so #6 spark plug can get fouled from transmission fluid. Also check your #6 cylinder spark plug wire and ends for excessive resistance. For your information, you can hold the center coil wire away from its contact, and instantly intensify the spark to all six cylinders while the engine is running. Be careful not to shock yourself.
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