Bosch 2008 - Manual (Page 34)

A 32 | 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 ...