About 63k miles. Is this a sign of a need to have a carbon cleaning completed? I have read numerous threads pointing me in that direction. I did fill up today... Maybe bad gas?

 

N18's don't have carbon build up problems. Might be bad gas but if you are spraying Meth it should not throw those codes since you are adding that octane boost. What map are you running when the codes are throw? With meth or no?

 

I was running Ca at the time.

 

Isn't C the race gas map? What's your meth flow rate?

 

500cc per minute

 

Any on this? Has is happened again?

 

No. Maybe bad gas. I did drop back down to the B map.

 

Have you figured out your P2C57 code? Does this happen when you're using the stock map?

You stated that this happens when cruising on the highway and you go to accelerate around someone. Generally these are high load situations that are a recipe for knock (if you keep it in high gear and not downshift).

 

I have not had it since fixing the small leak at the meth jet right angle adapter. I will probably know for sure this week as I have a few long trips on the highway this week. I have an auto so it would be downshifting on its own. Have not noticed if it happens when using the paddles.