Volkswagen Workshop Service and Repair Manuals

Checking with engine leak detector spray G 001 800 A1

Notes:

• ◆ 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.

• ◆ The safety precautions listed on the container must be adhered to.

• ‒ → Connect ignition tester V.A.G 1367 with pick-up clamp V.A.G 1367/8 or ignition tester V.A.G 1767.
• ‒ Connect fault reader V.A.G 1551 and select engine electronics control unit (address word 01); carry out selection with engine idling.
  

• ‒ Input 08 for "Read measured value block" function and confirm with Q.

• ‒ Input 00 for "Display group number" and confirm with Q.

• ‒ Observe reading in display zone 5 (Lambda reading) and note range of reading.
• ‒ Systematically spray parts of the intake system with engine leak detector spray.

If the engine speed drops and the reading strays from the above range:

• ‒ Check for leaks in the area of intake system sprayed and eliminate leak.