C 1500 Truck 2WD V8-454 7.4L (1990)
Idle Speed: Specifications
Minimum Idle Air Rate
Minimum Idle Air Rate
Idle Speed
Note: If the engine has less than 500 miles or is checked
at altitudes above 1500 feet, the idle rpm with a seated
IAC valve should be lower than the values above. Let engine
idle until proper fuel control status is open loop.
Manual Transmission
Neutral
700 +/- 25 rpm
Auto Transmission
Drive
625 +/- 25 rpm