GM Lumina/Silhouette/Transport APVs 1990-1999 Repair Guide

Ignition Coil

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TESTING



  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the two electrical connectors from the coil
  4.  
  5. Using an ohmmeter, check the ignition coil as follows:
  6.  

Step 1



Test for short to ground between B+ (to distributor) terminal and ground.
 
Use the high scale on the meter, should read infinity (open circuit).
 

See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: To test the coil, connect the ohmmeter as shown



Any reading other than infinity means the coil is bad and needs replacing
 

Step 2



Test for open circuits between C-(tach) terminal and C-(to distributor) terminals.
 
This test is for continuity. Reading should usually be less than 5 ohms (on the low scale). If not replace the coil.
 

Step 3



Test for an open between B+ (from the ignition switch) terminal and secondary output terminal (coil wire terminal).
 
Read the high scale on the meter. Should have some resistance, (about 7K ohms) should not read infinity; if it does, install a new coil.
 

  1. Reconnect the two electrical connectors onto the coil.
  2.  
  3. Connect the negative battery cable.
  4.  

REMOVAL AND INSTALLATION



  1. Disconnect the secondary lead (coil wire). Twist the boot 1 / 2 turn each way, while tugging on the boot. Do not pull on the wire.
  2.  
  3. Disconnect the primary electrical connectors (do not pry on latch/lock with a screwdriver, as it may break).
  4.  
  5. Remove the ignition coil mounting screw and nuts.
  6.  
  7. Remove the ignition coil.
  8.  

See Figure 2

Click image to see an enlarged view

Fig. Fig. 2: Diagram shows ignition coil and bracket location-3.1L Engine

To install:
  1. Install the screws and nuts to secure the coil.
  2.  
  3. Reconnect the primary electrical connectors. Assure that they are fully seated and latched.
  4.  
  5. Install the secondary lead (coil wire). Make sure it is fully seated and secured on the coil tower.
  6.  

 
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