Throttle Valve (TV) Control Cable Adjustment
Two methods of TV system adjustment are available.
1. TV cable adjustment with engine off.
2. TV control pressure check and adjustment procedure with engine on.
The Throttle Valve (TV) Control Cable System consists of a cable attaching stud on the throttle body throttle lever, the TV Control Cable Assembly, the External TV Control Lever on the transmission, and the Cable Mounting Brackets at the throttle body and transmission. As the throttle body lever is moved from idle to wide open throttle (WOT), the TV control cable pulls the transmission TV control lever from idle to WOT. Return of the cable and transmission lever towards idle is accomplished by the return spring on the transmission end of the cable assembly. This spring and the end of the cable assembly is protected by a flexible rubber boot. The transmission external TV control lever actuates the internal TV control mechanism which regulates the TV control pressure. The travel of this lever is controlled by stops internal to the transmission.
The TV control cable is set and locked to its proper length during initial assembly by pushing in the locking tab at the throttle body end of the cable assembly. When the tab is unlocked, the cable is released for adjustment. The take-up spring at this end of the cable automatically tensions the cable when released. With the slack taken up and the locking tab pushed in, the take-up spring plays no part in the operation of the system.
Under normal circumstances, it should not be necessary to alter or readjust the initial setting of the TV control cable. Situations requiring readjustment of the TV control cable include maintenance involving the removal and/or replacement of the throttle body, transmission, or TV cable assembly.
When the TV control cable is properly set, the transmission TV control lever will be at its internal idle stop (lever to rear as far as it will travel) when the throttle body throttle lever is at its idle stop.
TV Cable Adjustment with Engine Off
Note: At accelerator pedal WOT, the transmission TV control lever will not be at its WOT stop. The wide open throttle position must not be used as a reference point for adjusting the TV control cable.
Idle Speed Effect on the TV Control Cable
The 5.0L (302 CID) EFI Engines use an air By-Pass ISC that does not affect throttle position. Therefore, idle automatic setting does not affect TV Cable adjustment.
TV Cable Adjustment Procedure, Retention Spring
1. Set parking brake and put selector in N (do not put selector in P).
2. Remove the protective cover over the cable linkage (F-150-250 and Bronco vehicles only).
3. Verify that the throttle lever is at the idle stop. If it isn't, check for binding or interference in the throttle system. Do not attempt to adjust idle stop.
4. Verify that the cable routing is free of sharp bends or pressure points and that the cable operates freely. Lubricate the TV lever ball stud with Premium Long-Life Grease XG-1-C or -K (ESA-M1C75-B) or equivalent if necessary. Check for damage to cable or rubber boot.
5. Unlock the locking tab at the throttle body end by prying up with a small screwdriver to free the cable.
6. A retention spring must be installed on the TV control lever at the transmission, to hold it in the idle position (as far to rear as the lever will travel) with about ten pounds of force. If a suitable single spring is not available, two V8 TV return springs may be used. Attach retention spring(s) to the transmission TV lever and hook rear end of spring to the transmission case.
7. With the TV cable locking tab unlocked and the retention spring in place, rotate the transmission outer TV lever 10-30 degrees and return slowly.
8. Push down on the locking tab until flush.
9. Remove the retention spring(s) from the transmission TV lever.
TV Control Pressure Check and Adjustment with Engine On
NOTE: This procedure requires the use of TV Pressure Gauge with Hose T86L-70002-A or equivalent. The results of the adjustment procedure depend on the accuracy of the pressure gauge. The pressure gauge should be checked (and recalibrated if necessary) approximately four times a year or when the following occurs:
a. The needle will not return to 0 psi under no pressure.
b. The needle goes past 0 psi (negative side) under no pressure.
c. Bumping or dropping a pressure gauge.
1. Attach TV Pressure Gauge with Hose T86L-70002-A or equivalent to the TV port on the transmission. On some applications it might be easier to use the TV Pressure Fitting Service Tool No. D80L-77001-A.
2. Remove the protective cover over the cable linkage.
3. Insert the tapered end of the Cable TV Control Pressure Gauge Tool T86L-70332-A between the crimped slug on the end of the cable and the plastic cable fitting that attaches to the throttle lever. Push in gauge tool, forcing the crimped slug away from the plastic fitting. Make sure gauge tool is pushed in as far as it will go.
4. Operate the engine until normal operating temperature is reached (approximately 5-10 min. with transmission in park). The transmission fluid temperature should be approximately 100-150°F. Do not make pressure check if transmission fluid is cold or too hot to touch.
5. Set parking brake and place shift selector in N (neutral). With gauge block in place and engine idling in neutral, the TV pressure should be 33 ± 5 psi. For best transmission function, set the TV pressure as close as possible to the mean (average) pressure using the following procedure.
NOTE: Do not check or set TV pressure in P (park).
6. Unlock the TV Cable Locking Tab at the throttle body bracket. The adjuster preload spring should cause the adjusting slider to move away from the throttle body and the TV pressure should increase.
7. Push on the slider from behind the bracket until the TV pressure is 33 psi. While still holding the slider, push down on locking tab as far as it will go, locking slider in position.
NOTE: An increase of 1-2 psi is possible when transmission is shifted from NEUTRAL to a forward gear. This is considered normal and no compensation should be made.
8. Remove gauge tool, allowing cable to return to its normal idle position. With the engine still idling in neutral, TV pressure must be at or near zero (less than 5 psi). If not, reinstall gauge tool. Repeat Steps 6 and 7 but set the TV pressure to a pressure lower than previously set but not less than 26 psi. Remove gauge tool and recheck TV pressure to determine if it is at or near zero.
For deteriorated throttle lever grommets, read this caption: