Toyota Celica 1994-1998 Repair Guide

Spark Plug Wires

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TESTING



See Figure 1



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Fig. Fig. 1: 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, 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 resistance, remove each plug wire and test one at a time. Connect one lead of an ohmmeter to the electrode within the wire on the cap end; connect the other lead to the corresponding spark plug terminal end of the wire. Replace any wire which shows a resistance of over 25,000 ohms.

REMOVAL & INSTALLATION



See Figures 2, 3, 4, 5, 6, 7, 8 and 9

Some California 5S-FE models were equipped with a coil wire.

  1. Label and disconnect the wires from each spark plug one at a time. Some engines have spark plug wires which are labeled, No. 1, No. 2 ect. from the manufacture.
  2.  



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Fig. Fig. 2: Grasp the plug wire from the cylinder head cover and pull upwards to extract

If there is no tape around to label the wires. It may be a good idea to remove one spark plug wire at a time so not to mix them up during installation.

  1. Remove the spark plug wires from the distributor cap. On some models you may need to use a flat bladed tool to lift up the lock claw and disconnect the holder from the cap. Separate the wires at the grommet.
  2.  



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Fig. Fig. 3: The cap is usually marked by Toyota with the ignition markings



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Fig. Fig. 4: At the cap, use a screwdriver to lift up the lock claw and disconnect the holder



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Fig. Fig. 5: Release this clip to withdraw the wire from the cap



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Fig. Fig. 6: Do not pull on the cords, it may damage the conductor inside


WARNING
Do not pull on the plug wires to remove them, this may damage the conductor inside.

  1. Pull the plug wires from the retaining clamps.
  2.  

To install:
  1. Attach the holder and grommet portion to the distributor cap. Make sure that the holder is installed correctly to the grommet and cap.
  2.  



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Fig. Fig. 7: Connect the holder and grommet portion to the cap ...



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Fig. Fig. 8: ... check that the holder is correctly installed as shown

  1. Check that the lock claw of the holder is engaged by lightly pulling on the holder.
  2.  
  3. On the coil wire (if equipped), insert the grommet and holder together.
  4.  



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Fig. Fig. 9: Inspect the lock claw, the holder must be engaged. Lightly pull to inspect

  1. Secure the wires with the clamps.
  2.  

 
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