XJ-S Convertible (XJ27) V12-6.0L (1994)
Idle Speed/Throttle Actuator - Mechanical: Adjustments
1.
Warm engine to operating temperature.
2.
Ensure that throttle linkage and return springs are properly installed and in good condition.
3.
Start engine and run for 2 - 3 minutes.
Idle Speed Adjusting Screw
4.
Idle speed should be 750 rpm ± 25 rpm. If not, adjust Extra Air Valve screw until specified speed is reached. Valve is under side of left intake
manifold near throttle body.
NOTE: If high idle speed cannot be lowered to the specified level, thoroughly check all pipes and hoses to intake manifolds for possible leaks.
Check that both throttle butterfly closed screws show no signs of tampering. If they do, adjust throttle valves.