Found this on ls1tech. Worth checking into. The info below is referring to the Chinese made 92-102mm throttle bodies.
“Not all throttle bodies are machined for the large plastic LS1 pintle, so you are likely using the wrong IAC for it. Unless you have the hard idle set so low it has to be open for the car to run. It is likely just not able to close correctly. GM 17112350 has a smaller metal pintle and is wired the same as the LS1. Now if it only does it while the car is cold then it's just because of the design.”
“Update- Using said IAC motor, and after a retune, that whistle is GONE.
soooo, check your tune and buy that part number.“
“Not all throttle bodies are machined for the large plastic LS1 pintle, so you are likely using the wrong IAC for it. Unless you have the hard idle set so low it has to be open for the car to run. It is likely just not able to close correctly. GM 17112350 has a smaller metal pintle and is wired the same as the LS1. Now if it only does it while the car is cold then it's just because of the design.”
“Update- Using said IAC motor, and after a retune, that whistle is GONE.
soooo, check your tune and buy that part number.“
Last edited: