1968 – 1979 VW 1600 Transporter Throttle Valve Positioner

As part of the exhaust emission control system a throttle valve positioner is fitted which effects the closure of the throttle valve independently of the accelerator pedal. In over-run conditions (where momentum of the vehicle is driving the engine against a closed throttle) the throttle is prevented from closing completetely. This allows more air into the fuel mixture and thus prevents unburnt fuel from a rich mixture being passed through the exhaust to atmosphere. It reduces the effect of engine braking incidentally.

1968 – 1979 VW 1600 Transporter Throttle Valve Positioner Two Piece Type

1968 - 1979 VW 1600 Transporter Throttle Valve Positioner

1. Pull rod
2. Pull rod diaphragm
3. Vacuum hose to carburettor
4. Vacuum hose from control section
5. Valve
6. Spring for vacuum diaphragm
7. Vacuum diaphragm
8. Filter
9. Atmospheric pressure air vent
10. Altitude corrector
11. Locking screw
12. Adjusting screw

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