Rules of cleanliness
When working on the fuel supply or fuel injection
systems, the following "6 rules of cleanliness"
should be carefully observed:
Thoroughly clean all connections and the
surrounding area before disconnecting.
Place parts that have been removed on a clean
surface and cover. Use lint-free cloths only!
Carefully cover over opened components or
seal, if repairs are not carried out immediately.
Only install clean components:Only unpack
replacement parts immediately prior to
installation. Do not use parts that have been
stored loose (in tool boxes etc.)
When the system is open:Do not work with
compressed air if it can be avoided. Do not
move vehicle unless absolutely necessary.
Disconnected electrical harness
connectors:Protect from dirt and moisture. Be
sure harness connector is dry before
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Intake system, checking for leaks
Special tools and equipment
VAS5051 with VAG5051/1
orVAG1551 with VAG1551/3AEngine leak detection spray G 001 800 A1The negative pressure in the intake system sucks in the leak detection
spray with the unmetered air. Leak detection spray decreases ignition
quality and performance of the fuel mixture. This causes a reduction in
engine speed and a sharp increase of CO content. It is absolutely necessary to follow the safety precautions listed on the
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