Town Car V8-302 5.0L (1987)
Idle Speed Control Bypass Air (ISC-BPA) Valve: Procedures
WITH SPECIAL TOOLS
CAUTION: DO NOT use the following procedure on a Nippondenso ISC-BPA valve (black plastic), as damage may result. Nippondenso valves are
serviced by replacement only. Use only spray carburetor cleaner (Ford D9AZ-19579-BA, or equivalent). DO NOT spray directly on on throttle plates
or use any type of scrubbing method. If the vehicle is equipped with a Mass Air Flow (MAF) sensor, do not run the engine while cleaning the Idle Speed
Control By-Pass Air ISC-BPA valve.
1.
Remove the throttle inlet air duct.
2.
Disconnect the ISC-BPA valve connector.
3.
Connect the ISC-BPA actuator (Rotunda 113-00009, or equivalent) and the injector tester/cleaner (Rotunda 113-00001, or equivalent) to the
vehicle.
4.
START the actuator and then START the engine (non MAF engines only).
5.
Spray carburetor cleaner (Ford D9AZ-19579-BA, or equivalent) into the ISC-BPA valve for five seconds while actuator is operating.
6.
Turn OFF the actuator and STOP the engine (if running). Allow the solvent to soak for 15 minutes.
7.
Turn ON the actuator and START the engine (non MAF engines only).
8.
Spray carburetor cleaner into the idle ISC-BPA for up to 6 seconds (MAF equipped) or 1 minute (non MAF equipped).
9.
Turn OFF the actuator and shut OFF the engine (if running).
10.
Install the throttle inlet air duct and START the engine, allowing to run for 1 minute.
11.
Disconnect the actuator from the ISC-BPA valve. Connect the ISC-BPA connector.
12.
START the engine and check for proper operation.
WITH OUT SPECIAL TOOLS
Fig. 1 Air bypass valve solenoid
CAUTION: DO NOT use the following procedure on a Nippondenso ISC-BPA valve (black plastic), as damage may result. Nippondenso valves are
serviced by replacement only.
1.
Remove the Idle Speed Control By-Pass Air ISC-BPA valve from the throttle body.
2.
Remove the electrical solenoid assembly from the mechanical portion of the ISC-BPA valve by removing the two screws, then sliding the
mechanical portion away from the solenoid.
3.
Soak the mechanical portion of the ISC-BPA in carburetor cleaner (Ford D9AZ-19579-BA, or equivalent) for up to 3 minutes.
CAUTION: DO NOT exceed 3 minutes soaking time and DO NOT use choke cleaner, as internal damage may occur.
4.
With the mechanical portion completely submerged, shake in all directions (up, down, right, and left). Push in the on the rod that mates with the
solenoid assembly and again shake in all directions with the rod pushed in as far as possible.
