Hey Guys,
Going to the track Friday night, but it won't stop pinging at wot.
In California and the gas is only 91 octane (maybe). Changed the IAT, bypassed the tb coolant and don't have the hypertech programmed for power and put the screen back in the maf, still slight ping...most noticeable in second and third. Any idea and help would be appreciated!
ps don't won't to run any octane boost!

 

seafoam it, see if you can clean it up on the inside....

 

Do you think you're getting much PCV oil blow-by, if so maybe a oil catch can will take care of your problem.

Al

 

Even though you put the tune back to stock there still is some of the Hypertech left in the pcm I'm pretty sure. Get the pcm reflashed. Might be carbon if your using lots of oil. If not these two then it's the horrible 91 here in Ca. I have kr and some pinging so my timing is a whopping 17 degree's.

 

thanks guys,
i'm going to do the seafoam tomorrow and put the catch can in wednesday. i'll get a little `100 octane for friday just incase