Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1985C 20 P/U 2WD V8-454 7.4LREPAIR AND DIAGNOSISCRUISE CONTROLCRUISE CONTROL SERVO CABLEADJUSTMENTS
1985 Chevrolet C 20 P/U 2WD V8-454 7.4L
Cruise Control Servo Cable: Adjustments
1985 Chevrolet C 20 P/U 2WD V8-454 7.4LSECTION Adjustments
1985---87
Servo Unit Adjustment
To adjust servo on V6 and V8 gasoline engines, close throttle, then with ignition and fast idle off, adjust rod assembly length to give .020---.040 (Exc. C, K, R and V models with V6 engine) or .007---.015 (C, K, R and V models with V6 engine) inch clearance between rod and stud.
To adjust servo on G models with diesel engines, use third ball on servo chain. With ignition off, adjust cable jam nuts until cable sleeve at throttle lever is tight, without holding throttle open. To adjust servo on C, K, R and V models with diesel engines, position idle screw against stop, then with ignition off, assemble lower end of rod link to throttle lever and upper end to hole closest servo which will provide .040 inch slack maximum.
Engagement-Cruising Speed Zeroing
There is no provision for engagement-cruising speed zeroing. If cruising speed is too high or low, check vacuum hoses for improper routing, restrictions or leaks and servo linkage for proper adjustment. If cruising speed remains too high or low, replace the electronic controller.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.