The other day I was racing a friend's friend at the track which i was supposed to beat, but ended up losing to, then i raced my friend that i am usually neck and neck with and ended up losing to him pretty bad too. No mods had changed on any of the cars, so the next day i check my plugs that i had just changed no more than 5k miles ago, and i found them looking like they were rusted and looks like there might have been oil on the threads or something for some reason. Once i changed them i raced my friend that i am usually neck and neck with and found that i was a bit quicker but still not 100 percent. About 1k later on these new plugs and im feeling a bit sluggish again, going to check them again tommorrow. Any help as to what may be causing this would be appreciated....



BTW all races took place safely at the track.....

thanks in advance!

 

do you use fuel additives?

 

on that set of plugs i did, but now on these new plugs i havent used any and im feeling the loss of accelaration again. gonna check them later tonight

 

http://www.classictruckshop.com/club...park/plugs.htm

good pictures. as for that condition

 

^^^ Interesting. To the OP: are you using stock heat range?

 

yes i am using the stock heat range, and i dont think it is the MMT, because i am having a loss in performance.

 

took one plug out this morning, just about 1k after installing my new plugs they look like theyre turning the same way. No additives were used with this set of plugs.



btw the irriduim part of the plug is still good, its just hard to tell from the pic because i took it with my phone.

 

If that plug came out of a boat engine that was saltwater cooled then I would say u have water in the cylinders. But not sure how a plug would get rusty coming out of a car engine.....

 

https://my350z.com/forum/showthread....ght=spark+plug

check out blastin's picture and compare to your spark plugs hole