What's up guys? I need some people to bounce a few ideas off me to help me diagnose this problem. A 2007 Chevrolet Silverado, V-Max has a violent and what seems to be un-tunable surge, caused from the TB opening and closing itself from 20-28% TPS with steady accelerator pedal input. Idle is fine until you blip the throttle then sometimes it undershoots and overshoots commanded idle speed because it opens too far then closes too much. You would think that'd be a BRAF issue but I can't nail it down no matter what I change.
With two different Nick Williams (one old C5 style, and one new style) They both surge like this and both throw the same code.
It comes up as a P2119, description: Throttle Actuator Control Throttle Body Range/Performance. Whatever that means.
If you install an LS3 style TB it can be tuned to run just fine, but as soon as you stick one of these puppies on it you either have idle or WOT.
I have the ETC Scalar set at 7158 so I'm not really sure what's going on.
Does anyone know if the throttle body wiring pinout is different between the trucks and say..... a 2010 Camaro?
The tune is attached and is far from perfect but this issue is making drivability tuning impossible.
Thanks guys,
-Robbie.