Sly_Z_28

how do you adjust your cars idle?

BUBBA

What's your problem?

shoebox

Idle speed is controlled by the computer. Re-programming is necessary to change it.

Sly_Z_28

i was going to put on A bbk 52mm TB, and i noticed i needed a gasket, then i put my stock one back on and my car idle's at 2,000!! Did i touch somthing on accident?

shoebox

Did you re-connect the IAC?

Injuneer

Common problem with the aftermarket throttle body is that the throttle stop screw is screwed out too far, not letting the blades closed fully. That take control of the idle away from the PCM/IAC system.

First, make sure you don't have the cable too tight. Then look at the stop screw, and back it off until the idle drops to spec for your car. Then check the IAC counts to make sure they are between maybe 20-40. Then check the TPS closed throttle voltage to verify it is between 0.20-0.90 Volts. If you want, at this point you could slot the holes in the TPS so it can be rotated to get the voltage in the range of 0.50-0.65 Volts..... not necessary, but some people prefer it. But don't adjust the TPS voltage until you have verified the idle speed and the IAC counts.