fuel AUDI A4 1999 B5 / 1.G AFC Engine Lock Carrier Removing For Service Workshop Manual
Page 8 of 35
- Disconnect all harness connectors on fuel injectors.
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Page 9 of 35
15-14
- Disconnect positive crankcase ventilation
connections on left and right cylinder head
covers.
- Disconnect fuel supply and return lines.
- Unclip cover on intake air housing.
- Remove both screws under cover.
- Push back and lift intake air housing upward.
- Pull vacuum hose off left side and remove
housing.
- Remove left-side cover for fuel injector lines.
- Detach accelerator pedal cable and lay clear.
- Disconnect line from Idle Air Control (IAC) valve
at throttle body.
- Disconnect harness connector at IAC valve and
throttle position sensor.
- Disconnect vacuum pipe at the cruise control vacuum control actuator.
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g for service
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Page 16 of 35
15-18
Compression pressure, checking
Engine warm-oil temperature at least 30 C
(86 F)
Throttle valve fully open during cranking
- Disconnect harness connectors from ignition coil
power output stage and from all six fuel
injectors.
- Use compression pressure recorder VAG 1381
together with adapter 1381/5 or equivalent to
measure compression.
Note:
Refer to operating instructions for use of the
recorder.
- Operate starter until tester shows no additional
increase in pressure.
Compression pressures
New: 9-14 bar (131-203 psi)
Wear limit: 7.5 bar (109 psi)
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g for service
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