Compression pressures, checking

WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Special Tools - Compression Pressures, Checking

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Special tools, testers and auxiliary items required

Spark plug removal tool 3122 B
Compression tester V.A.G 1763
Puller T40039

Work procedure

Engine oil temperature min. 30 ° C.
Battery voltage at least 12.5 V.

Switch off ignition.

Fig 2: Removing Rear Engine Cover

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Remove rear engine cover - arrows -.

Fig 3: Identifying Front Engine Cover

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Remove front engine cover - arrows -.

Fig 4: Removing Coolant Hoses At Coolant Expansion Tank

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Remove coolant expansion tank - arrow -.
Disconnect electrical connection from Engine Coolant Level (ECL) Warning Switch F66 at bottom of coolant reservoir and set aside coolant reservoir with coolant hoses - 1 - and - 2 - connected.

Fig 5: Disconnecting Check Valve From Connection At Air Duct Hose

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Disconnect check valve - 1 - from connection at air duct hose.
Remove air duct hose, thereby loosening hose clamp - 2 - and opening clips - arrows -.

Fig 6: Identifying Bolts & Air Duct

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Remove bolts - arrows -.
Remove air duct - 1 - and - 2 -.

Fig 7: Disconnecting Electrical Harness Connectors

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Remove bolts - arrows - and separate electrical connections at ignition coils of left cylinder head.

NOTE:

Ignore items - 1 to 4 -.

Fig 8: Disconnecting Electrical Harness Connectors

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Remove bolts - arrows - and separate electrical connections at ignition coils of right cylinder head.

NOTE:

Ignore items - 1 to 5 -.

Fig 9: Removing Ignition Coils Using Ignition Coil Puller T40039

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Remove ignition coils using ignition coil puller T40039.

Fig 10: Disconnecting Electrical Harness Connectors

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On rear of left cylinder head, disconnect electrical harness connector - 3 - for fuel injectors.

NOTE:

Ignore - 1 - , - 2 - and - arrow -.

Fig 11: Separating Electrical Connector, Removing Bolt And Retainer For Connection

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On rear of right cylinder head, disconnect electrical harness connector - 1 - for fuel injectors.

NOTE:

Disregard - arrow -.

Using spark plug removal tool 3122 B , remove spark plugs.
Check compression using compression tester V.A.G 1763.

NOTE:

Using tester operating instructions.

Have a second technician press accelerator pedal completely and at the same time operate starter long enough until pressure increase no longer appears on tester.

Compression pressure	bar pressure
New	11.0 to 14.0
Wear limit	10.0
Difference between cylinders	max. 3.0

Assembly is in reverse order of removal, note the following:

Install spark plugs →
- 01 - MAINTENANCE
- 01 - MAINTENANCE for MAINTENANCE PROCEDURES - CABRIOLET
.
Finally, check DTC memory and, if necessary, erase it. After DTC memory is erased, a readiness code must be generated for the engine control module using operating mode "Guided Fault Finding".

Torque specifications

Component	Nm
Hose clamps 9 mm wide	3