V 2500 P/U 4WD V6-262 4.3L (1987)
Idle Speed: Adjustments
Fast Idle Speed
Check and, if necessary, adjust ignition timing before adjusting fast idle speed. Make all adjustments with engine at normal operating temperature,
choke fully open, air cleaner installed and A/C control off, if equipped.
1.
Disconnect and plug vacuum hoses as directed on vehicle emission label.
2.
Position fast idle screw on high step of fast idle cam, then start engine.
3.
Turn fast idle screw in or out and adjust fast idle speed to specifications.
