I thought I did this but I have gotten annoyed with the laggy off idle throttle response. And I decided a crudded up TB would cause a bind coming off idle.
I did recall reading that these need a thorough cleaning at 100k. I am at 130k now.
So I really went at it. I went for broke and moved the TB open manually with my fingers despite the drive by wire. That seemed fine.
I sprayed and scrubbed top and bottom with carb cleaner. Tons of black crap in there, especially where the throttle blade would actually make contact.
Result? I think it is fixed. So satisfying. I need my snap. And it no longer does that thing where you get more throttle than you wanted after you press the gas a bit off the line. That was annoying.
It did set a DTC for throttle body performance which I cleared. I assume it did not like me manually working the throttle (though the engine was off).
05 Cadillac STS throttle body cleaning
Re: 05 Cadillac STS throttle body cleaning
Sweet - now I need another test drive.
Re: 05 Cadillac STS throttle body cleaning
Me too. Off-idle throttle response was always annoying in that car. Especially if you were trying to drive it smoothly.
Re: 05 Cadillac STS throttle body cleaning
After some more driving, including to lunch today with Adam, I can update this. First impressions are usually incomplete.
In short, this has definitely improved but there is still some lag present off idle and what I don't really know is whether it is just part of the calibration or perhaps the throttle motor is just...a little tired. Or something else.
But the good news is, there is a more direct relationship to the amount of throttle I give off idle and the torque I get (after a small delay). I did snap it today and Adam can verify that it was a pretty sharp snap, which I don't think it previously was capable of. So things definitely moved in the right direction.
In short, this has definitely improved but there is still some lag present off idle and what I don't really know is whether it is just part of the calibration or perhaps the throttle motor is just...a little tired. Or something else.
But the good news is, there is a more direct relationship to the amount of throttle I give off idle and the torque I get (after a small delay). I did snap it today and Adam can verify that it was a pretty sharp snap, which I don't think it previously was capable of. So things definitely moved in the right direction.