Century V6-173 2.8L VIN W FI (1987)
Throttle Body: Adjustments
Model B115 Throttle Body Assembly
ADJUST MINIMUM THROTTLE POSITION
NOTICE:
Adjustment should be performed only when installing a replacement throttle body. The idle stop screw is used to regulate the minimum throttle
valve position. On original equipment throttle bodies, it is adjusted at the factory, then covered with a plug to discourage unnecessary
readjustment.
CAUTION:
The minimum throttle valve position is critical to vehicle performance and component durability. If the throttle valve is adjusted too far open,
it will cause the Idle Air Control (IAC) valve pintle to constantly bottom on its seat and result in early valve failure. If the throttle valve is not
open far enough, the vehicle may not start in cold weather or may stall during warm-up.
ADJUSTMENT PROCEDURE
Tool required: "Scan" tool
^
Back throttle stop screw out until an air gap between the screw and the throttle lever can be seen by looking downward from above the throttle
body.
^
Turn the stop screw in until it just contacts the throttle lever.
^
Turn the stop screw in 1 to 1/2 turns further.
IDLE LEARN PROCEDURE
Any time the battery is disconnected, the programmed position of the Idle Air Control (IAC) valve pintle is lost, and replaced with a "default"
value. To return the IAC valve pintle to the correct position, perform the following procedure:
