to keep the cold start valve from injecting too much fuel and flooding the engine
Jaguar: XJ6 4.2 Series II USA, Canada and Japan models from engine no. 8L67735 (May 1978) and european models from engine no. 8L79250 (January 1979) plus all 4.2 Series III models • XJ12 Series II fuel injection models from engine no. 7P25001 (May 1975) plus all Series III models
Range Rover: Classic 3.5 V8 Efi, 3.9 V8 Efi and 4.2 V8 LSE models from VIN...CA167942 (1985-96)