fuel AUDI A4 1998 B5 / 1.G AFC Engine Assembly Workshop Manual

10-1


Engine, removing and
installing

Rules of cleanliness


CAUTION!

Whenever carrying out work on the fuel
supply and fuel injection systems, carefully
observe the following five rules of
cleanliness.
1 - Thoroughly clean fuel system line and hose
connections and the surrounding area before
disconnecting.
2 - Place removed components on a clean
surface and cover. Use plastic sheeting or paper.
Do not use fluffy rags that could leave lint!
3 - Carefully cover over or seal any components
that have been opened if repairs are not carried
out immediately.
4 - Install only clean parts:

Do not remove replacement parts from the
packaging until immediately before they are to
be installed.

Do not use parts that have been stored without
packaging (e.g. in toolboxes, etc.).
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5 - When the fuel system is opened:

Avoid working with compressed air whenever
possible.

Avoid moving the vehicle if possible.
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10-2

Safety precautions


WARNING!

Be sure the ignition is switched OFF, when:

Disconnecting ignition wires
Disconnecting fuel injection system wiring
Connecting or disconnecting test equipment
leads
Disconnecting the battery
Washing the engine or engine
compartment.

CAUTION!

BEFORE disconnecting the battery:
Stop the engine.
Be sure the ignition is switched OFF (also
applies when connecting the battery). Failure
to do so may damage the Engine Control
Module (ECM).
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10-6

- Disconnect harness connectors at Mass Air
Flow (MAF) sensor and Idle Air Control (IAC)
valve, unbolt hose from plenum chamber and
unclip.

- Disconnect hose connection at IAC valve.

- Remove air guide between air cleaner and
throttle body.

- Remove air cleaner housing.

- Disconnect fuel supply and return lines.

- Remove coolant expansion tank.

- Remove cover for electronics box.
- Unclip engine control module and disconnect harness connectors.
- Disconnect harness connectors at connector station below engine
control module.
- Disconnect ground connection and bracket for harness connectors at
plenum chamber.
- Disconnect both coolant lines to heater core between plenum chamber
and engine.
- Disconnect accelerator pedal cable and let hang free.
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