Loctite. Try it! Keeps threaded connections from loosening.
For less than $20 for a set of eight, it is not worth taking the risk of an ignition issue.Loctite. Try it! Keeps threaded connections from loosening.
Doesn't seem to be a problem with mine. Good radio comm and no ignition noise (dual emag with auto plugs). My assumption is that the cap makes good contact between the base of the cap and the shoulder of the plug threaded seat, leaving the sealant on the back side of the threads.But will locktite insulate the connection? Not sure, but you do want a solid electrical path between the lead, cap and threads.
In addition to the potential for backing off (which you can fix if you booger up the threads a bit), they appear to be able to generate electrical noise. We had some XM interference that we traced to the ignition, when the engine was running. We did a lot of troubleshooting before replacing the plugs with fixed connection models, and that seemed to fix things.
Last time I bought plugs, I got them from Rockauto.com - they had the best price.