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.
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Things you need
- Spark plug socket
- Spark plug gapping tool
- Dielectric grease
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.
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.
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.
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.
Repeat the process on each remaining plug until you have replaced them all. Close the bonnet.
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