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TR2/3/3A Cylinder misfire

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Quick and easy. One at a time, disconnect - then reconnect - a plug wire. The disconnected wire which causes no change, is probably the misfiring cylinder.
 
Found problem. No. 3 Plug was only threaded part way in on the install.... went for a drive and the plug blew out Doh? Have to check threads in the block now as the plug has minor thread damage near first couple of threads.:unsure:
 
mctriumph said:
Chase it out with a plug thread tool( OTC the autoparts store) .Lesson learned......
Mad dog
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Thats good advice. I do have a thread tool that I bought from the last time i screwed up. :rolleyes: It threaded in fine. The first couple threads on the plug are a bit squashed in one spot but I believe I can carefully fix that with a small file since it is a brand new plug. Karl
 
Had a service done at a Jifi Lub years ago on our Chevy Impala. Went out to dinner with friends and when we were leaving standing by the car with it running I could hear a chuffing sound. At home in the garage I found the center plug on the front bank was threaded in at an angle and only a couple of threads held it. With a long extension on the plug socket I got it threaded in straight with no damage to the plug or head.
Back plug I could understand but right in front???
David
 
DavidApp said:
Had a service done at a Jifi Lub years ago on our Chevy Impala. Went out to dinner with friends and when we were leaving standing by the car with it running I could hear a chuffing sound. At home in the garage I found the center plug on the front bank was threaded in at an angle and only a couple of threads held it. With a long extension on the plug socket I got it threaded in straight with no damage to the plug or head.
Back plug I could understand but right in front???
David
Click to expand...
You're lucky the threads in the block and plug were still OK. Sometimes the plug can get cross threaded and strip when tightening it in again. I suspect the threads in the block, being of a harder metal, will often straighten out the softer plug metal......but not always.:cautious:
 
I recently had an issue on a Miata where the first few threads of a spark plug hole were damaged. I sourced a spark plug back tap thread chaser from Amazon for less than $30. That tool allows the thread chaser to be collapsed, inserted into the spark plug hole and then expanded using to the good lower threads as a guide to clean up the upper threads. Worked a treat.
 
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