GM Full Size Vans 1987-1997 Repair Guide

Glow Plugs

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INSPECTION



See Figure 1

  1. Check all connections on the controller.
  2.  
  3. Check the upper copper stud nuts on the controller. Do not tighten them.
  4.  
  5. Check the engine harness ground connection and the wiring harness nuts. Tighten them to 44 inch lbs. (5 Nm).
  6.  
  7. Check that the four-wire connector at the controller is seated properly and latched.
  8.  
  9. Tighten the controller mounting nuts to 25 ft. lbs. (35 Nm).
  10.  



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Fig. Fig. 1: Glow plug diagnosis with an ammeter

REMOVAL & INSTALLATION



  1. Disconnect the negative battery cables.
  2.  
  3. On the 6.2L engine and the left side only of the 6.5L, disconnect the glow plug lead wires and then remove the plugs. You'll need a 3 / 8 in. (9.525mm) deep-well socket.
  4.  
  5. On the right side of the 6.5L engine, raise the van and support it with safety stands. Remove the right front tire.
  6.  
  7. Remove the inner splash shield from the fender well.
  8.  
  9. Remove the lead wire from the plug at the No. 2 cylinder. Remove the lead wires from plugs in the Nos. 4 and 6 cylinders at the harness connectors.
  10.  
  11. Remove the heat shroud for the plug in the No. 4 cylinder. Remove the heat shroud for the plug in the No. 6 cylinder. Slide the shrouds back just far enough to allow access so you can unplug the wires.
  12.  
  13. Remove the plugs in cylinders No. 2, 4 and 6.
  14.  
  15. Reach up under the vehicle and disconnect the lead wire at No. 8. Remove the glow plug. You may find that removing the exhaust down pipe make this a bit easier when working on Nos. 6 and 8.
  16.  
  17. Installation is the reverse of removal. Install all glow plugs and carefully tighten them to 13 ft. lbs. (17 Nm) for the right side on the 6.5L; 17 ft. lbs. (23 Nm) on all others.
  18.  

 
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