Operation CHARM: Car repair manuals for everyone.
Home >> Chevrolet >> 1994 >> G 30 Van V8-454 7.4L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Idle/Throttle Speed Control Unit >> Adjustments
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Idle/Throttle Speed Control Unit: Adjustments

Idle Speed Control Actuator Adjustment:





PROCEDURE:

- Before adjusting ISC actuator you must first check the minimum idle speed to be within specifications. Refer to SPECIFICATIONS/IDLE SPEED. (ISC actuator must have vacuum applied so that it is not contacting the throttle lever.) See image VIEW A.
- Remove vacuum hose on ISC actuator on warm engine.
- Adjust ISC actuated idle speed to 1300 +/- 50 RPM. See image VIEW B.
- Install vacuum hose.
pro multis · About Operation CHARM