1982 Jaguar XJ-SFACTORY OEM SERVICE PROCEDURE

Air Injection System: Testing: XJ6

  1. Warm engine to operating temperature and allow to idle. Disconnect air by-pass hose at air cleaner. Air should be coming out with engine warm. If not, check air pump and switching valve wiring.
  2. Disconnect electrical wiring at thermal switch and connect leads together. Air should stop at by-pass hose. If not, check wiring and switching valve operation.
  3. Connect CO meter to both exhaust manifold check ports. With no air injection and engine warm, CO level should be 0.1-0.3%. Disconnect thermal switch leads and connect them together. Mixture should stabilize at 0.1-0.3%. If not, check vacuum to switching valve.
  4. Disconnect air switching module connector. CO level should rise to 0.4-0.6%. Reconnect thermal switch and air switching module; CO level should return to normal. If system does not operate as described, replace switching module.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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