GM Caprice 1990-1993 Repair Guide

Canister

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REMOVAL & INSTALLATION



  1. Loosen the screw holding the canister retaining bracket.
  2.  
  3. Rotate the canister retaining bracket and remove the canister.
  4.  
  5. Tag and disconnect the hoses leading from the canister.
  6.  
  7. To install, connect the hoses to the canister according to the tags.
  8.  
  9. Install the canister into the retaining bracket.
  10.  
  11. Tighten the screw holding the canister retaining bracket.
  12.  

FILTER REPLACEMENT



  1. Remove the vapor canister.
  2.  
  3. Pull the filter out from the bottom of the canister.
  4.  
  5. Install a new filter and then replace the canister.
  6.  

PRESSURE CONTROL VALVE



Testing
EXCEPT 5.0L (VIN Y) ENGINE
  1. Using a hand-held vacuum pump, apply a vacuum of 15 in. Hg. (51kPa) through the control vacuum tube to the purge valve diaphragm. If the diaphragm does not hold 5 in Hg. at least for 10 seconds, the diaphragm is leaking. Replace the control valve.
  2.  
  3. With the vacuum still applied to the control vacuum tube, attach a short piece of hose to the valve's tank tube side and blow into the hose.
  4.  
  5. Air should pass through the valve. If it does not, replace the control valve.
  6.  

5.0L (VIN Y) ENGINE
  1. Disconnect the control valve hoses. Connect a piece of hose to the carburetor bowl tube opening at the control valve.
  2.  
  3. Blow air into the hose and air should pass through the valve and out of the ported purge vacuum fitting and canister purge fitting of the control valve.
  4.  
  5. If not as specified the valve must be replaced.
  6.  
  7. Using a hand-held vacuum pump, apply a vacuum of 15 in. Hg. (51kPa) to the manifold vacuum tube on the control valve. If the diaphragm does not hold vacuum for at least for 20 seconds, the diaphragm is leaking. Replace the control valve.
  8.  
  9. With the vacuum still applied to the control valve, again try to blow into the hose. Air should not pass through the valve. If it does, replace the control valve.
  10.  

Removal & Installation
  1. Disconnect the hoses from the control valve.
  2.  
  3. Remove the mounting hardware.
  4.  
  5. Remove the control valve from the vehicle.
  6.  
  7. Installation is the reverse of the removal procedure. Refer to the Vehicle Emission Control Information label, located in the engine compartment, for proper routing of the vacuum hoses.
  8.  

 
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