Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJAGUAR1985VANDEN PLAS L6-4.2LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE FULL OPEN SWITCHDESCRIPTION AND OPERATION
1985 Jaguar Vanden Plas L6-4.2L
Throttle Full Open Switch: Description and Operation
1985 Jaguar Vanden Plas L6-4.2LSECTION Description and Operation
Fig. 2 Engine Compartment Locations:
The throttle valve switch is attached to the throttle chamber, and actuates in response to accelerator pedal movement. This switch has two sets of contact points. One set monitors the idle position and the other set monitors full throttle position. The idle contacts close when the throttle valve is positioned at idle and open when at any other throttle position. The full throttle contacts close only when the throttle valve is positioned at full throttle or more than 34 degree opening of the throttle valve. The contacts are open when the throttle valve is at any other position. The idle switch compensates for enrichment during idle and after idle, and sends fuel cut signal. The full throttle switch compensates for enrichment in full throttle.
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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.