Bosch 2008 User Manual download pdf (Page 34)

A32 | Gasoline injection components

Bosch Automotive Aftermarket 2008 | 2009

Canister-purge valve

System:

Motronic

Purpose:

Vapors are produced in the fuel tank due to external heat radiation or surplus fuel having

warmed-up in the engine compartment while ﬂowing back from the fuel circuit. These vapors

are purged by way of an activated charcoal ﬁlter. This ﬁlter retains the fuel vapor and only

allows the air to escape into the open. This also ensures pressure equalization. For regular

regeneration of the activated charcoal, a further pipe containing the canister-purge valve is

routed from the carbon canister to the intake manifold. The canister-purge valve (regeneration

valve) is actuated such that the activated carbon canister is adequately purged with minimal

Lambda deviations.

Part number:

0 280 142 150 – 0 280 142 499

Central injection unit (Mono-Jetronic)

Systems:

Mono-Jetronic, Mono-Motronic

Purpose:

The main component of Mono systems is the central injection unit. This contains the injector,

the pressure regulator, the throttle valve, the throttle-valve actuator and sensors for intake-air

temperature and throttle-valve position. Bosch supplies the appropriate workshop parts sets

for repair work. The replacement parts range can be found as of Page A 46. The parts sets for

the top and bottom sections of the central injection unit are also listed in the vehicle applica-

tions (B Section).

Part number:

0 438 201 ...,

BX: 0 986 438 5.., 0 986 438 6..

Cold-start valves

Systems:

D, L, LH, K, KE-Jetronic, Motronic (some)

Purpose:

The cold-start valve injects additional fuel into the intake manifold during the starting phase.

In this process, the fuel is highly atomized by a swirl nozzle. The cold-start valve is attached to

the intake manifold so as to provide a uniform supply for all cylinders. The injection time of the

cold-start valve is limited by the thermo-time switch or the electronic control unit.

Part number:

0 280 170 ...

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 74 75

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Bosch 2008 User Manual Page 34