Country Squire V8-302 5.0L VIN F FI (1988)
Throttle Valve: Adjustments
Vehicles With Throttle Valve Rod Linkage
ADJUSTMENT
1. Check curb idle speed, adjusting as necessary. Ensure curb idle speed is set to specification with and without the throttle solenoid positioner
(anti-diesel solenoid) energized, if equipped.
2. Using adapter fitting D80L-77001-A or equivalent, attach suitable pressure gauge to Throttle Valve (TV) port on transmission, using enough
flexible hose so that gauge can be read while operating engine.
TV Control Pressure Gauge Block Tool
3. Obtain TV control pressure gauge block No. D84P-70332-A or fabricate a block 0.390-0.404 inch thick.
4. Run engine until it reaches normal operating temperature and the throttle lever is off fast idle, or the Idle Speed Control (ISC) plunger, if
equipped, is at its normal idle position. Ensure transmission fluid temperature is approximately 100-150° F.
5. Apply parking brake, place shift selector in Neutral, remove air cleaner, and shut off air conditioner. If equipped with a vacuum operated throttle
modulator, disconnect and plug vacuum line to this unit. If equipped with a throttle solenoid positioner or an idle speed control, do not disconnect
either of these units.
6. With engine idling in Neutral and no accessory load on engine, insert gauge block between carburetor throttle lever and adjustment screw on the
TV linkage lever at the carburetor, as shown in the TV Control Pressure Gauge Block Tool image. The TV pressure should be 28-88 psi. For
optimum setting, use adjusting screw to set pressure as close to 33 psi as possible. Turning the screw in will raise the pressure 1.5 psi per turn and
backing out the screw will lower the pressure. If equipped with idle speed control, some hunting may occur and an average pressure reading will
have to be determined. If the adjusting screw does not have enough adjustment range to bring TV pressure within specification, first adjust rod at
transmission as previously described.
7. Remove gauge block, allowing TV lever to return to idle. With engine still idling in Neutral, TV pressure must be less than 5 psi. If not, back out
adjusting screw until TV pressure is less than 5 psi, then reinstall gauge block and ensure TV pressure is still 28-38 psi.
