Vanden Plas L6-4.2L (1982)
Overrun Valve: Testing and Inspection
1.
Loosen the hose clamp securing the over-run valve air feed hose to the throttle body and block the hose.
2.
Start the engine; if idle is correct, stop engine and reconnect overrun valve.
3.
Start engine, if the idle speed is not correct with valve connected, replace the overrun valve.
