Mono-Motronic injection and ignition system
Checking intake air system for leaks (unmetered air)
Special tools, testers and auxiliary items
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◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with
▸ 07.93: Cable V.A.G 1551/1
08.93 ▸: Cable V.A.G 1551/3
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◆ Engine leak detector spray G 001 800 A1
Test sequence
Notes:
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◆ The vacuum in the intake system will cause the leak detector spray to be drawn in with the unmetered air. The leak detector spray reduces the ignitability of the mixture. This leads to a drop in engine speed and to a change of Lambda probe reading.
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◆ The safety precautions listed on the container must be adhered to.
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‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select engine electronics control unit (address word 01); carry out selection at idling.
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