Spark Plug blow by

Replaced plugs @62000, and both middle cylinders produced some discoloration on the coils from loose plugs. Wtf Toyota.

 

Yep. Welcome to the club.

 

What year truck?

 

Profile was old
2017 TRD sport

 

That's interesting. I just did mine last week, 2017 also, no discoloration. 70k miles.

Added antiseize on the threads like usual, had a couple that were dragging pretty good on the way out.

 

Only one of mine was like this when I changed them last week at 64k miles. My buddies were all fine. Both of our trucks are 2017s OR

 

My son used to have a 2009 Honda Fit. It was reported on that forum that plugs coming loose was a common problem. I was skeptical until a trouble code (cylinder misfire) appeared along with my son saying that he could smell the engine. Out of four plugs two were loose, with one almost ready to blow out. Why plugs can come loose on certain engines, I don't know...because in my 55 years of automotive experience I had never seen this until the Honda.

 

my 17 plug swap, was fortunately, drama free at 67000. made in mexico. now the main water bypass pipe? another story.

 

4 out of 6 of mine were loose