How to Remove Spark Plugs From a Jaguar 1990 XJS

Written by tara kimball Google
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The spark plugs in your Jaguar XJS have approximately a 30,000-mile lifespan. Replace them regularly to keep your Jaguar’s engine running at its most efficient. Purchase plugs for your car from an auto parts retailer or Jaguar dealership. Pre-gapped plugs are available, but you should confirm the gap of each plug before installation. Save a costly dealership service bill and change the plugs of your Jaguar at home.

Skill level:

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Things you need

  • Spark plug socket
  • Ratchet
  • Spark plug gapping tool
  • Dielectric grease

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  1. 1

    Open the bonnet of your XJS. Choose a spark plug as a starting point. The spark plugs are beneath the plug wires that run across the top of the engine.

  2. 2

    Grab the boot on top of the plug wire, then twist and pull up to remove it from the spark plug. Remove the plug with a spark plug socket and ratchet.

  3. 3

    Check the gap on the new plug. Slide a gapping tool into the space between the metal piece on the top of the plug and the electrode. The gapping tool should read 35-thousandths. Press the top of the plug down against a solid surface to close the gap if it is too large, or bend the tip to increase the gap if it is too small.

  4. 4

    Thread the new plug into the engine by hand. Once you have started the plug in the threads, tighten it with the spark plug socket and ratchet. Add a small drop of dielectric grease to your Jaguar’s plug wire boot. Push the boot into place. It clicks when it is secure.

  5. 5

    Repeat the process on each remaining plug until you have replaced them all. Close the bonnet.

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