Hard starting / acceleration hesitation at altitude??? (Flagstaff, AZ = 7000ft)

In Flagstaff, AZ and car seems to be hard to start and have developed a hesitation upon acceleration. I am guessing it is altitude related, but will the adaptive programming in the ECU "correct" itself to allow for the thinner air?

I have a programmer, but have the stock tune loaded.


Thanks,
Scott

 

Yeah going from the flat plains of Oklahoma to 7000 ft ASL will cause the car to run differently

 

haha welcome to no air. The adaptives "Should" correct your issue rather quickly?

What are you doing in Flagstaff?

 

The adaptives will take care of it. The only thing that doesn't happen all by itself is adjusting for outside air pressure if you change altitude without turning it off and back on. When you start the car it uses the (one) MAP sensor to get ambient air pressure. After that it uses the MAP sensor for ... MAP. So if you did something like drove from the Bay to Tahoe without doing a key cycle it's still going to think it's sea level outside. The adaptives will still take care of your closed loop A/F cause that's done off the front O2 sensors but the MAP readings are going to be affected. Maybe that's contributing to the hesitation? You will be running rich in open loop/WOT but that's not going to hurt you.

 

I grew up in flag and had to tune my cars like crazy to run in town...then drive down the valley and they turned into beasts

its at least 7000ft depending where you are.....