GM Firebird 1982-1992 Repair Guide

Servo

Print

REMOVAL & INSTALLATION



See Figures 1 through 9

  1. Disconnect the electrical connector and vacuum hoses at the servo.
  2.  
  3. Disconnect the actuating chain, cable or rod from the servo.
  4.  
  5. Remove the screws holding the vacuum servo and solenoid unit to the bracket, then remove the unit.
  6.  

To install:
  1. Connect the large diameter brake release vacuum line to the servo unit. Connect the vacuum hose from the vacuum control valve to the servo unit.
  2.  
  3. Connect the actuating chain, rod or cable to the servo.
  4.  
  5. Install the servo unit to the bracket; tighten the screws to 12 inch lbs. (1.4 Nm).
  6.  
  7. Install the electrical connector to the servo.
  8.  
  9. Adjust the cable, rod or chain.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Servo mounting on 1982-1984 2.5L engines



Click image to see an enlarged view

Fig. Fig. 2: Servo mounting on 1982-1984 carbureted V6 and V8 engines



Click image to see an enlarged view

Fig. Fig. 3: Servo mounting on Crossfire Injection engines



Click image to see an enlarged view

Fig. Fig. 4: Servo mounting on 1985-1986 2.5L engines



Click image to see an enlarged view

Fig. Fig. 5: Servo mounting on fuel injected 2.8L engines



Click image to see an enlarged view

Fig. Fig. 6: Servo mounting on carbureted V6 and V8 engines after 1984



Click image to see an enlarged view

Fig. Fig. 7: Servo mounting on 1985-1990 Tuned Port Injection engines



Click image to see an enlarged view

Fig. Fig. 8: Servo mounting on 3.1L engines



Click image to see an enlarged view

Fig. Fig. 9: Servo mounting on 1991-1992 Tuned Port Injection engines

ADJUSTMENTS



Do not stretch cables or chains to make pins fit or holes align. This will prevent the engine from returning to idle.

Cable Type
  1. Check that the cable is properly installed and that the throttle is closed to the idle position.
  2.  
  3. Pull the servo end of the cable toward the linkage bracket of the servo. Place the servo connector in one of the 6 holes in the bracket which allows the least amount of slack and does not move the throttle linkage.
  4.  
  5. Install the retainer clip. Check that the throttle linkage is still in the idle position.
  6.  

Rod With Screw Adjuster

  1. Inspect the rod assembly for proper attachment to the servo and throttle stud. Make certain the throttle is at idle.
  2.  
  3. Adjust the slotted bracket or the rod to obtain a clearance of 0.02-0.04 in. (0.5-1.0mm) between the throttle stud and the end of the bracket slot.
  4.  
  5. Install the retainer clip; make certain the throttle is still at idle.
  6.  

Rod With Adjustment Holes

  1. Inspect the rod to be sure it is securely connected to the servo and throttle linkage; make certain the throttle is at idle.
  2.  
  3. Install the retainer pin in the hole which provides the least slack between the servo bracket and the retainer.
  4.  
  5. Check the throttle; it must still be in the idle position.
  6.  

Chain and Cable

CHAIN AT THROTTLE
  1. Check for proper installation of cable assembly. Inspect the throttle; it must be in the idle position.
  2.  
  3. Install the chain in the swivel so that the slack does not exceed 1 / 2 the diameter of the ball stud.
  4.  
  5. Install the retainer on the swivel and make sure the throttle has not moved from idle.
  6.  

CHAIN AT SERVO
  1. Check for proper installation of cable assembly. Inspect the throttle; it must be in the idle position.
  2.  
  3. Install the cable on the third link of the chain; adjust the jam nuts of the servo until there is no noticeable slack in the chain.
  4.  
  5. Tighten the jam nuts and check that the throttle has not moved out of the idle position.
  6.  

 
label.common.footer.alt.autozoneLogo