Chevrolet 25515598 Transmission Throttle Valve Cable Assembly

Indeed, the throttle cable controls line pressure, shift feel and shift timing, as well as part throttle and detent downshifts, and performs the functions of the vacuum modulator and downshift cable of other transmissions. The throttle cable goes to the throttle lever and bracket assembly at the transmission to the throttle idler lever for L4 engines or directly to carburetor/TBI throttle lever for V6 and VS engines and thru throttle cable and the adjuster mounted on a bracket near the carburetor or throttle body. The throttle cable requires fine tuning once disconnected from the carburetor/TBI unit and reconnected and this is done when the engine is off. For the carbureted and TBI models, the air cleaner should be removed, all the hoses should be labeled in order to be reattached easily. At the throttle cable adjuster assembly, there is a metal readjusting tab; this tab has to be pushed down and locked while the motion of the cable housing into the slider continues until it reaches the collar; the tab may then be unlocked. For V6 and V8 engines, by opening the carburetor/TBI lever manually but to the full throttle stop position will let the cable to ratchet through the slider and it will adjust itself automatically and finally the carburetor lever has to be released. L4 engines: For the same automatic readjustment as described above, the idler lever must be turned to maximum travel stop position and to adjust the throttle cable, the TBI lever must be avoided but rather rotate the idler lever. Last is the road test of the vehicle; however, if one cannot be done, or only full throttle shift is felt, then the dealer should be sought for further examination.

Finally, check the cable for sticking or binding and conduct a road test to ensure proper operation.

The first step is to remove the throttle cable retaining clip from the throttle body throttle shaft lever arm to disengage the throttle cable.