Midsize LTD L4-140 2.3L SOHC (1986)
Idle Speed/Throttle Actuator - Mechanical: Description and Operation
Throttle Solenoid Positioner With Dashpot
The Throttle Solenoid Positioner (TSP) with or without Dashpot combines the features of the throttle solenoid positioner (TSP) and the dashpot by
attaching a dashpot to the end of the TSP plunger.
The TSP acts as a variable carburetor throttle stop by extending its plunger when power is supplied to the solenoid and by retracting the plunger when
power is turned off. When the TSP is energized, it will hold the throttle at an idle position, but, as soon as it is deenergized at the ignition switch, the
TSP will function like an anti-dieseling device by automatically retracting its plunger into an anti-dieseling position, fully closing the throttle.
A TSP may also be used to increase the throttle opening when the air conditioning is turned On.
The dashpot is used on certain applications when a gradual, controlled throttle closing is desired, either for emission purposes or vehicle driveability.
Two kinds of TSPs with a dashpot are used: the fixed plunger rod length type and the adjustable plunger rod length type.
The TSP with a dashpot is not strong enough to open the throttle but will hold it open after it has been mechanically opened.
