The main element of the fuel system is the carburetor or injection system, which is checked and adjusted at the factory for a specific engine and fuel grade. Increased fuel consumption and reduced engine power are usually not a defect in the fuel system, but have other causes, among which driving style and driving conditions play a particularly important role. Therefore, in carburetors, it is only necessary to carefully adjust the idle system. Proper adjustment of the idle system has a significant impact on the operation of the engine in transient conditions up to medium engine speeds.
Fuel
Refueling of the car must be carried out only with the appropriate gasoline. When refueling the vehicle with unleaded fuel, the valve seats must be made of hardened material and the initial ignition timing is shifted to a later ignition. All vehicles manufactured since February 1986 (except for LPA engines) can be operated on unleaded fuel.
Engines with a displacement of 1.3 dm3 / 69 hp and 1.6 dm3 / 79 and 105 hp can be operated on unleaded fuel since September 1984. However, when using unleaded fuel, every 4 fills must be made with leaded fuel, and for an OHV engine, a clear valve clearance is required.
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