Mesozoic
Well-Known Member
- Joined
- October 3, 2015
- Messages
- 385
- Reaction score
- 154
- City, State
- Tucson, AZ
- Year, Model & Trim Level
- '00 Mercury Mountaineer
Ok, so the Mountaineer runs really good now. I retorqued the intake and exhaust headers, buttoned everything up and it's pretty turnkey at this stage.
I do have some odd issues with idle, though. Once the truck has been idling in either neutral or drive for some period of time, it seems like it will try to go into closed loop control or something and when it transitions to this mode, the idle speed dips drastically and sometimes the engine will stall. I've tuned the TC_OVER and TC_UNDER values in the Tweecer tune to speed up the ISC airflow correction rate which has helped, but surely there must be a way to tune this more precisely so the transition is smoother and doesn't even dip noticeably.
I do have some odd issues with idle, though. Once the truck has been idling in either neutral or drive for some period of time, it seems like it will try to go into closed loop control or something and when it transitions to this mode, the idle speed dips drastically and sometimes the engine will stall. I've tuned the TC_OVER and TC_UNDER values in the Tweecer tune to speed up the ISC airflow correction rate which has helped, but surely there must be a way to tune this more precisely so the transition is smoother and doesn't even dip noticeably.