tune is messed up?

[blackFbird_98]

Well I just ran my truck on the Autotap program because it didnt fill right to me for some reason and sure enough my truck isn't hitting open loop when it is floored infact it never hit open loop untill I was braking coming off the interstate, I dont have alot of info on thesetrucks and frankly dont find much help on any wedsites so maybe someone here can help

by the way it is a 2002 chevy 1500HD with a 6.0

[3.4 slow to go]

Re: tune is messed up?

Is it throttle by wire? is the tps measuring that the butterfly plate is actually opening enough to get it into open loop?

[blackFbird_98]

Re: tune is messed up?

well I was wondering if it was the TPS myself but it didnt throw a code for that so I wonder if that is what it is or no


Here is what I was told by a guy on the Chevy message board

Truck should start in open loop. Truck will go into closed loop once a number of criteria are met: hot enough coolant temp (~185*), o2 sensor temp, and a predetermined time value beginning when truck is first started...


but not sure if that is right