General information about engine tuning Difficult starting, insufficient engine power and increased fuel consumption are usually associated with general wear or improper adjustment of engine mechanisms and systems,...
Tool and equipment In addition to the basic set of tools, the following will be required to adjust the engine: Candle wrench size 14 mm (or similar socket wrench) - for loosening spark plugs...
Spark plug Examination Candles should be removed for inspection at the intervals prescribed " Maintenance Schedule ". Remove high-voltage wires from candles, holding on to the caps, because...
Compression test With severe wear on the main mechanisms of the engine, adjustment may be useless - this is especially true for cars with high mileage. To assess the condition of the cylinders,...
Valve clearances This section applies to 1.1L and 1.3L engines only. On these engines, valve adjustment does not require the special tool needed to remove the tappet shims. Valve adjustment for...
Distributor and ignition timing On Golf, Jetta and Scirocco models, either a conventional ignition system with a contact breaker-distributor can be installed, or a contactless electronic ignition system...
Carburetor adjustment NOTE. The carburetor should be adjusted last, after checking and adjusting all other engine systems. To prevent unskilled interference, plugs in the form of plastic or aluminum...
Fuel injection system (injection engine) Idle speed adjustment The idle speed is adjusted in the same way as on carbureted engines. The adjusting screw is located on the rear side of the throttle body near the intake...