Aerostar L4-140 2.3L SOHC (1986)
5.
Let engine idle and check base idle speed (575 +/- 25 RPM).
NOTE:
Engine may stall when ISC is disconnected. This is acceptable as long as the throttle plate is not stuck in the bore.
6.
Adjust as follows:
^
Disconnect throttle cable.
^
Adjust base idle speed within the 575 +/- 25 RPM range by turning the throttle plate stop screw.
^
Reconnect the throttle cable.
^
Repeat Step 5.
Idle Speed Setting Procedures
7.
Shut engine off and reconnect power lead to idle speed control air bypass valve.
8.
Verify throttle plate is not stuck in bore by exercising throttle plate.
9.
Adjust the throttle position sensor (TPS) as follows:
^
Disconnect processor 60 Pin connector and inspect for damaged pins, corrosion, and loose wires. Service as necessary.
^
Install Breakout Box and reconnect processor.
^
Set a DVOM to the 20V scale, and connect the DVOM from test Pin 47 to test Pin 46.
^
Turn the key to On with the engine Off.
^
The DVOM should rear 1.0 +/- 0.1 volts with the throttle lever resting on the throttle plate stop screw.
^
Adjust the TPS as required to bring the voltage into the 1.0 +/- 0.1 range by first loosening the two TPS retaining screws. Rotate the TPS
clockwise to increase voltage or counterclockwise to decrease voltage. Tighten the retaining screws and recheck voltage.
^
Remove the Breakout Box, then reconnect the processor.
NOTE:
If excessive engine idle speeds are experienced when driving the vehicle on the system, turn the ignition switch to Off position and restart.
