Silhouette V6-191 3.1L VIN D TBI (1995)
Throttle Body: Service and Repair
Throttle Body Injection Service Information
TBI 220 Identification
TBI unit repair procedures cover component replacement with the unit on the vehicle. However, throttle body replacement requires that the
complete unit be removed from the engine.
An eight digit part identification number is stamped on the throttle body. Refer to this number if servicing or part replacement is required.
WARNING: To reduce the risk of fire and personal injury, relieve the fuel system pressure before servicing fuel system components.
After relieving system pressure, a small amount of fuel may be released when servicing fuel lines or connections. To reduce the chance of
personal injury, cover fuel line fittings with a shop towel before disconnecting to catch any fuel that may leak out. Place the towel in an
approved container when disconnect is completed.
FUEL PRESSURE RELIEF PROCEDURE
1. Disconnect negative battery terminal to avoid possible fuel discharge if an accidental attempt is made to start the engine.
2. Loosen fuel filler cap to relieve tank vapor pressure.
3. The internal constant bleed feature of TBI Model 220 relieves fuel pump system pressure when the engine is turned "OFF." Therefore, no further
pressure relief procedure is required.
CLEANING PROCEDURES
All TBI component parts, with the exception of those noted below, should be cleaned in a cold immersion cleaner such as GM X-55, following
instructions on the container.
NOTICE: DO NOT put the Throttle Position (TP) sensor, Idle Air Control (IAC) valve, fuel meter cover assembly, fuel injectors, and other
components containing rubber, in a solvent or cleaner bath. A chemical reaction will cause these parts to swell, harden, or distort. Do not soak the
throttle body with these parts still attached. If the throttle body assembly requires cleaning, keep soaking time in the cleaner to a minimum. Some
models have hidden throttle shaft dust seals that could lose their effectiveness by extended soaking.
THREAD-LOCKING MATERIALS
IMPORTANT: The hardware used to attach the fuel meter body assembly and TP sensor are factory coated with thread-locking adhesive. If the
fuel meter body assembly or TP sensor is removed for service, inspect the attaching hardware screw threads for thread-locking material. The screw
threads should have enough thread-locking material (adhesive or compound) on the threads to insure proper re-locking. If not, clean the screw
threads, and apply Loctite 262 to the screw threads before reassembly. Replacement screws for the fuel meter body assembly are included in the
service screw assortment package. New attaching hardware is included in the TP sensor service package.
If the fuel meter cover is removed for service, apply Loctite 262 to the screw threads of the attaching screws before installing the cover.
