Idle Speed: Adjustments

IDLE SPEED

1. Unplug spout line and verify that ignition timing is base +/- 2 degrees BTDC.
2. Remove PCV hose from throttle body and plug it. Remove canister purge hose from throttle body and connect Rotunda tool T89P-9600-AH (0.200 inch diameter orifice) between PCV and CANP ports.
3. Disconnect Idle Speed Control Air Bypass Solenoid.
4. Place automatic transmission in NEUTRAL.
5. Start engine and run at idle.
6. Check/adjust idle rpm
Turn the throttle plate stop screw to 800 +/- 30 rpm.
7. Shut engine OFF and disconnect battery for 5 minutes minimum.
8. Remove CANP hose from PCV connector of throttle body and reconnect it to its CANP fitting. Unplug PCV hose and reconnect it to its PCV fitting.
9. Reconnect Idle Speed Control Air Bypass Solenoid, verify the throttle is not stuck in the bore and linkage not preventing throttle from closing.
10. Start engine and stabilize for 2 minutes then goose the engine and let it return to idle, lightly depress and release the accelerator let engine idle. If idle problem still exists check for other possible causes.