Note
The most common cause of incorrect fuel injection advance angle is incorrect installation or loose tightening of the fuel injection pump mounting bolts.
Formation of wax crystals in fuel at low ambient temperatures, leading to a reduction or complete cessation of fuel supply, usually occurs in the fuel filter. Most often, this malfunction is quickly eliminated by heating the filter.
The exhaust from an engine warmed up to normal temperature should be practically colorless.
[The original information is posted on the resource: vwmanual.ru]
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