K 1500 Truck 4WD V8-305 5.0L (1988)
per specifications with seated IAC valve.
15.
Turn ignition OFF and reconnect IAC valve electrical connector.
16.
Disconnect the SCAN tool or tachometer.
17.
Use silicon sealant or equivalent to cover stop screw hole.
18.
Install air cleaner, adapter and gasket.
CONTROLLED IDLE SPEED
Transmission
Gear
Idle Speed
IAC Counts [1]
OPEN/CLOSED LOOP [2]
Man.
N
600
5-30
OL
Auto
D
500
5-30
O
Auto*
D
550
5-30
CL
[1] Add 2 counts for engines with less than 500 miles. Add 2 counts for every 1000 ft. above sea level.
[2] Let engine idle until proper fuel control status is reached (OPEN/CLOSED LOOP).
[*] 3 Speed Auto in a C1500 Pickup w/federal emissions (NA5) and no AIR system.
MINIMUM IDLE AIR RATE
Transmission
Gear
Engine Speed
OPEN/CLOSED LOOP [1]
Man.
N
500 +/- 25
OL
Auto.
D
425 +/- 25
OL
Auto.*
D
425 +/- 25
CL
[*] Without AIR system
[1] Let engine idle until proper fuel control status (OPEN/CLOSED LOOP) is reached.
