Hyundai Coupes/Sedans 1986-1993 Repair Guide

Secondary Air Control Valve

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TESTING



Feedback Carburetor

See Figure 1



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Fig. Fig. 1: Secondary air valve location-1986-89 Excel

  1. Disconnect the air supply hose from the air cleaner and check for vacuum by placing your thumb over the end of the air supply hose.
  2.  
  3. With engine coolant temperature between 64-145°deg;F (18-63°deg;C) and the engine idling, the hose should draw vacuum.
  4.  
  5. With the engine coolant temperature at 145°deg;F (63°deg;C) or more, the hose should draw vacuum for 70 seconds after start-up. The hose should not draw vacuum after 70 seconds.
  6.  
  7. With the engine coolant temperature at 145°deg;F (63°deg;C) or more, and the engine decelerating from 4000 rpm, the hose should draw vacuum.
  8.  

If the secondary air control valve is not functioning properly, emission may blow back.

  1. Remove the secondary air control valve.
  2.  
  3. Blow in the air cleaner side of the valve to check that air does not flow through the valve.
  4.  
  5. Connect a hand vacuum pump to the secondary air control valve nipple and apply 5.9 in. Hg of vacuum.
  6.  
  7. Air should flow from the air cleaner side to the exhaust manifold side. Air should not flow from the exhaust side to the air cleaner side.
  8.  
  9. Replace the air control valve if it fails any of the above tests.
  10.  
  11. Tighten the air control valve to 51-61 ft. lbs. (69-82 Nm).
  12.  

 
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