Volkswagen Golf Service & Repair Manual: Checking compression
Special tools and workshop equipment
required |
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Spark plug socket and extension -3122 B- |
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Compression tester -V.A.G 1763- |
Engine oil temperature at least 30 °C. |
Battery voltage at least 12.5 V |
– |
Remove fuse for fuel pump control unit from fuse holder.
Fuse assignment → Current
flow diagrams, Electrical fault finding and Fitting locations |
Note
Removing fuse interrupts voltage supply for fuel pump
control unit. |
– |
Start engine and run it until it turns off. |
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– |
Release hose clips -1- and
-2-, and remove air pipe. |
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|
– |
Pull off connector -2- and
unscrew bolt -1-. |
– |
Pull out ignition coils with output stages. |
– |
Unscrew spark plugs using spark plug socket and extension
-3122 B-. |
– |
Check compression using compression tester -V.A.G 1763-.
Refer to
→ operating manual for information on how to use it. |
– |
Have a second mechanic press down accelerator completely and
simultaneously operate starter until pressure no longer
increases on tester display. |
– |
Repeat procedure on each cylinder. |
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|
|
Compression pressures |
bar |
New |
10.0 … 15.0 |
Wear limit |
7.0 |
Maximum difference between
cylinders |
3.0 |
Installation is carried out in the reverse order; note the
following: |
– |
Install ignition coils with output stages
→ Chapter. |
– |
Entries are stored in the event memory of the engine control
unit because electrical connectors were disconnected and the
engine was started: Generate readiness code
in Guided functions
→ Vehicle diagnostic tester. |
→ Chapter „Assembly overview - ignition system“ |
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|
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Removing
–
Remove coolant pump
→ Chapter.
–
Remove air filter housing
→&nbs ...
Other materials:
Assembly overview - control units, LHD vehicles
1 -
Control unit
Versions with parking aid:
Parking aid control unit -J446-
Assembly overview
→ Chapter
Versions with park assist steering:
Park assist steering control unit -J791-
...
Calibrating adaptive cruise control
Conditions
–
The adaptive cruise control unit -J428- needs to be
calibrated if the following conditions apply:
Adaptive cruise control unit -J428- has been removed and
then reinstalled or it has been ...
Repairs and technical modifications
First read and observe the introductory information
and safety warnings Repairs and modifications must always be carried
out according to Volkswagen specifications .
Unauthorised modifications to the electronic components or software in the vehicle
may cause faults. As the electronic co ...
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