Thread: Need help....sputtering bad

606s aren't bad. But you can run a cooler plug to help fight KR, which is an enemy for our cars. But no, cooler plugs do not have a hotter spark. They have a cooler spark. Same idea of running a cooler t-stat. To help prevent predetermination due to excessive heat.

Originally Posted by Zef_66

606s aren't bad. But you can run a cooler plug to help fight KR, which is an enemy for our cars. But no, cooler plugs do not have a hotter spark. They have a cooler spark. Same idea of running a cooler t-stat. To help prevent predetonation due to excessive heat.

Fixed. But yeah... that is why they call it dropping a heat range down. The blower increases the IAT tremendously and in turn, running a colder range spark plug to combat predetonation. Have you been constantly scanning your KR?

Did you gap the new plugs?
If the old were at .050" and worn, then that suggests they had started out smaller.. odd...but possible.

Also if your misfire doesn't go away and you check spark at the plug..then it's a possible ICM. I have seen one or two not fire the second plug at the correct time. Really goofy when that happens.