Bought HF $20 testor with 4 different sized screw in leads.
None seem to work.
Anyone have these?
Am I just not patient enough to screw it in?
I have one and it worked fine...it does have to screw in a ways for it to work if I remember correctly
Me too. Harbor freight, and it works fine. Is it possible your heads have had work and the plug holes have been tapped for a different size thread?
Compare the threads on the adpators to the threads on the spark plug you pulled out. That's an easy way to match them.
--DD
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