First NGK copper TR6 failure...
Thread Starter
Drifting
Joined: Dec 2016
Posts: 1,388
Likes: 220
First NGK copper TR6 failure...
I've had no issues with NGK plugs for over 15 years of wrenching. I've had issues with Bosch, Delco, etc of misfires developing after a plug swap. For the first time ever, an NGK plug failed - completely. It wouldnt spark at all, header tube was cold after a 10 min drive. It was NOT a loose plug wire, I swapped it with another set. It was NOT a badly seated plug, i pulled and replaced. It was NOT a bad coilpack. It was literally a 100% dead plug. I was inspecting it and noticed its labeled MADE IN USA OF JAPANESE PARTS or something similar. Coincidence? Maybe... but I'm going to avoid USA NGKs. Seems like the tip of the plug is covered with a plastic sheath instead of the normal cardboard. Swapped it with my next set (always have two sets of plugs, oil filter spare) and it is totally fine.
scared the sht out of me since it was a cyl 7 misfire... and we all know Cyl 7 is the one that normally pops.
Anyway, my 2C/experience - If you get plastic sheathed NGKs and develop a misfire soon after changing the plugs, swap and retest.
scared the sht out of me since it was a cyl 7 misfire... and we all know Cyl 7 is the one that normally pops.
Anyway, my 2C/experience - If you get plastic sheathed NGKs and develop a misfire soon after changing the plugs, swap and retest.
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
I had my first (and last) TR6 failures about 15 years ago. It was more than one out of a set of 8. Haven't used them since...and won't. They have their place. If you change plugs often, maybe use them. I lost my joy of changing spark plugs a long while ago. Delco 41-104's are the same heat range and last almost forever.
Thread Starter
Drifting
Joined: Dec 2016
Posts: 1,388
Likes: 220
