1992 Jaguar XJS 2D ConvertibleFACTORY OEM SERVICE PROCEDURE

Auxiliary Air Valve (XJS)

  1. Remove auxiliary air valve. See AUXILIARY AIR VALVE R & I in the REMOVE/INSTALL/OVERHAUL article in this section. Fully close idle speed adjustment screw. Immerse auxiliary air valve sensing bulb into container of boiling water and observe valve head through side port. Valve should move smoothly to closed position.
  2. Blow air through side port. No air should pass through port. Allow sensing bulb to cool. Valve head should move smoothly back to open the main air passage. If valve operation is not as specified, replace auxiliary air valve. If the auxiliary air valve operation is okay, install valve and adjust idle speed. See IDLE SPEED & MIXTURE in the following:
Factory Service Tools

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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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