XJ-S V12-5.3L (1982)
Idle Speed: Adjustments
IDLE SPEED
ADJUST
Ensure engine is at normal operating temperature. Check throttle linkage for correct operation, check that return springs are secure and effective.
Start engine, run for two to three minutes.
Set idle speed adjustment screw (3) to achieve 750 rev/min.
NOTE: If it proves impossible to reduce idle speed to specified level, check ALL pipes and hoses to inlet manifolds for security and condition,
also check operation of overrun valves.
Check security of injectors and cold start injectors. Ensure that all joints are tight and that inlet manifold to cylinder head fastenings are tight.
Ensure that both throttle butterfly closed stops show no signs of tampering; if they do adjust throttle butterfly valves. Check operation of overrun
valves. If the above operations do not reduce idle speed, check operation of auxiliary air valve.