Multitec system
1. The fuel vapor extraction system is designed to reduce the amount of unburned hydrocarbons released into the atmosphere.
2. The fuel filler cap is sealed, the charcoal filter is installed under the right front fender, it collects gasoline vapors from the tank when the vehicle is not in operation. These vapors are stored there, and when the engine starts, they enter the intake duct, and from there into the engine, where they are burned. Filter control valve (up) opens via a vacuum pipe connected to the throttle body on C16 NZ, C16 NZ2 and C18 NZ engines. On XI6 SZ engines, the valve is opened via the purge valve electronics mounted on the camshaft housing.
Motronic system
3. System as described in Section 4B, except that the carbon filter is controlled by the fuel injection/ignition unit via the vent valve in the fuel tank. To make sure the engine is running properly when it is cold and/or idling, and to protect the catalytic converter from a rich mixture, the valve does not open until the engine is running at partial or full load. The valve winding is energized and the stored steam flows into the intake duct.
4. Procedures for removing and installing the charcoal filter are described in Chapter 11.
5. On C20 NE engines, the ventilation valve is mounted above the injectors of cylinders 2 and 4. To remove it, disconnect the negative cable from the battery and the wiring from the valve, then disconnect the two ventilation hoses, noting their position. Remove the valve from the mounting bracket, or unscrew the bracket together with the valve.
6. On C20 XE engines, the vent valve is located at the left end of the engine, below the end of the fuel injector harness housing (see illustration). The removal and installation procedures are described in the previous paragraph.
Simtec system
7. For information see "general description" in Section 4B. note that "AIR" is short for "Air Injection Reactor" (toxicity neutralization system).
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