ISUZU Amigo/Pick-ups/Rodeo/Trooper 1981-1996

Spark Plug Wires

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The 1996 3.2L engine does not utilize spark plug wires; it uses individual coil packs, which mount directly on top of the spark plugs.

TESTING

See Figures 1 and 2



Click image to see an enlarged view

Fig. Fig. 1: Checking plug wire resistance through the distributor cap with an ohmmeter



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Fig. Fig. 2: Checking individual plug wire resistance with a digital ohmmeter

At every tune-up/inspection, visually check the spark plug cables for burns, cuts, or breaks in the insulation. Check the boots and the nipples on the distributor cap and/or coil. Replace any damaged wiring.

Every 50,000 miles (80,000 km) or 60 months (whichever occurs first), the resistance of the wires should be checked with an ohmmeter. Wires with excessive resistance will cause misfiring, and may make the engine difficult to start in damp weather.

To check spark plug wire resistance on vehicles equipped with distributor ignition systems:

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the distributor cap from the distributor assembly.
  4.  
  5. Visually inspect the spark plug wires for burns, cuts or breaks in the insulation. Check the spark plug boots and the nipples on the distributor cap and coil. Replace any damaged wiring.
  6.  
  7. Inspect the spark plug wires to insure that they are firmly seated on the distributor cap.
  8.  
  9. Disconnect the spark plug wire(s) thought to be defective at the spark plug.
  10.  
  11. Using an ohmmeter, measure the resistance between the distributor cap terminal and the spark plug terminal.
  12.  

Make certain that a good connection exists between the distributor cap and the spark plug wire. Never, under any circumstances, measure resistance by puncturing the spark plug wire.

  1. If the measured resistance is less than 7000 ohms per foot (30.5cm) of wire, the wire is good. If the measured resistance is greater than 7000 ohms per foot (30.5cm), the wire is defective and should be replaced.
  2.  
  3. Connect the negative battery cable.
  4.  

To inspect the spark plug wire resistance on vehicles equipped with distributorless ignition systems:

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the spark plug wires from the spark plugs by grasping the spark plug wire boot, then pulling and twisting the boot at the same time. Detach the spark plug wires from the ignition coils in the same manner.
  4.  
  5. Visually inspect the spark plug wires for burns, cuts or breaks in the insulation. Check the spark plug boots and the nipples on the coil unit(s). Replace any damaged wiring.
  6.  
  7. Using an ohmmeter, measure the resistance between both ends of the plug wire.
  8.  

Never, under any circumstances, measure resistance by puncturing the spark plug wire.

  1. If the measured resistance is less than 7000 ohms per foot (30.5cm) of wire, the wire is good. If the measured resistance is greater than 7000 ohms per foot (30.5cm), the wire is defective and should be replaced.
  2.  
  3. Install the spark plug wires.
  4.  
  5. Connect the negative battery cable.
  6.  

REMOVAL & INSTALLATION



See Figures 3 and 4

  1. Disconnect the negative (-) battery cable.
  2.  

To prevent possible incorrect spark plug wire installation, remove and install spark plug wires one at a time. Refer to the engine firing order diagrams in Engine Electrical , if any confusion arises.

  1. If equipped, remove the spark plug wires from the wire brackets.
  2.  
  3. Grasp the spark plug wire by the boot, then twist the boot back and forth several times to free it from the plug. Pull the boot from the spark plug.
  4.  


WARNING
DO NOT tug on the wire to remove it.

  1. Remove the other end of the spark plug wire from the distributor or ignition coil units, depending on which ignition system the vehicle has.
  2.  



Click image to see an enlarged view

Fig. Fig. 3: The 2.2L Hombre shows a typical spark plug wire routing for 4-cylinder in-line engines



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Fig. Fig. 4: Since some spark plug wires can be confused with others, make sure to either replace one at a time or label them prior to removal-2.2L Hombre engine shown, other 4-cylinder engines similar

To install:
  1. Before reconnecting the spark plug wire, lubricate the entire inside surface of the boot with dielectric compound.
  2.  
  3. When installing a new set of spark plug wires, make sure the boot is installed firmly over the spark plug and distributor cap tower, or ignition coil tower.
  4.  
  5. Route the wire exactly the same way as the original and fasten the wire loom clips securely when done.
  6.  

 
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