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Showing results for tags 'NGK plug cap'.
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So I've been chasing ignition problems lately (see my post re 123IgnitionUSA dizzy and melted cap center button), so I've been going over my total spark system looking for problems. I (re)-discovered one issue with the plugs. Years ago I had a persistent misfire and finally started swapping out plugs one at a time until I found the culprit. You may not be aware that the tip of these plugs is threaded on. That tip screws right off. There was one plug with a VERY loose cap. Threaded it back on tight, misfire went away. Magic. I remembered this last night, so I checked my 6 last night, EVERY ONE was loose from just a little to 1/2 to 3/4 of a turn! Every time you take the plug wires off (something some of use do more than others...), you give that tip a bit of torque I guess, and eventually.... I tightened up the tips, fired it up, and guess what. The smoothest idle I've had in a LONG TIME... The car ran 'ok' prior to this. Tons of power, just that nagging feeling that it wasn't as smooth as it could be. My AFR gauge used to jump around more than I thought was normal. Under static cruise, you'd swear there was a transient misfire going on. No more. Touch key, car starts, idles nice. Funny how a healthy ignition system makes you car run better. Big surprise... Go check your plug caps. Tighten down with a vise grip. Don't bust the insulator, just snug it up. No don't use locktight. Non-conductive.
