GM Caprice 1990-1993 Repair Guide

Vacuum Servo Unit

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See Figures 1 and 2



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Fig. Fig. 1: Cruise control vacuum hose routing - 5.0L (VIN Y) engine



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Fig. Fig. 2: Cruise control vacuum hose routing - 1990 4.3L, 5.0L (VIN E) and 5.7L engines

REMOVAL & INSTALLATION



  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 and 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.  

Vacuum System Linkage Adjustment

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

  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.  

 
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