Diagnostic Aids

Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore causing the throttle valve not to close. Observe the Freeze Frame/Failure Records.
The throttle valve is spring loaded to a slightly open position. This is referred to as the rest position.
The throttle valve should not be completely closed or open any more than a specified amount.
The throttle valve should move open and to the closed position without binding under the normal spring pressure.
The throttle should not be free to move open or closed without spring pressure.
For an intermittent condition, refer to Intermittents .