Compression, Checking

Fig 1: Identifying Special Tools - Compression, Checking

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Special tools, testers and auxiliary items required

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

Procedure

Engine oil temperature min. 30 C.
Battery voltage min. 12.5 V.

Switch off ignition.

Fig 2: Identifying Noise Insulation Quick-Release Fasteners

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Loosen quick-release fasteners - 1 - and remove front noise insulation.

Fig 3: Disconnecting Electrical Connector On Engine Speed (RPM) Sensor G28

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Disconnect electrical connector on Engine Speed (RPM) Sensor G28 - arrow - at bottom of transmission.

Fig 4: Removing Rear Engine Cover

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Remove front engine cover - 1 - and rear - 2 - - arrows -.

Fig 5: Removing Bolts And Left Air Duct

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Remove bolts - arrows - and remove left air duct.

Fig 6: Identifying Hose Clamps And Bolts

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Loosen hose clamp - 1 - and remove bolts - 2, 3, 4 -.
Remove upper part of left air filter housing.

Fig 7: Identifying Electrical Connector On Mass Air Flow Sensor

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Disconnect electrical connector - arrow - on mass air flow (MAF) sensor 2 G246.

Fig 8: Removing Bolt And Remove Power Steering Reservoir From Bracket, Hydraulic Lines Remain Connected

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Remove bolt - arrow - and remove power steering reservoir from bracket, hydraulic lines remain connected.

Fig 9: Removing Oil Dipstick & Bolts

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Remove oil dipstick - 2 - from guide tube.
Remove bolts - 1 - and - 3 -.
Disconnect electrical connectors to ignition coils and press wiring harness to side.

Fig 10: Identifying Vacuum Hoses And Bolts For Right Air Guide

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Remove bolts - arrows - and remove right air duct.

Fig 11: Identifying Hose Clamps And Bolts

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Disconnect vacuum hose - 5 - from air guide hose.

CAUTION: Hose connectors - 4 - must not be opened. Lay aside right upper part of air filter housing with connected crankcase ventilation hose.

Loosen hose clamp - 6 - and remove bolts - 1 ,2 and 3 -.
Remove upper part of right air filter housing.

Fig 12: Identifying Electrical Connector On Mass Air Flow Sensor

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Disconnect electrical connector - arrow - on Mass Air Flow (MAF) Sensor G70.

Fig 13: Tilting Upper Part Of Air Filter Housing Up/Out

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Remove lower part of air filter housing from side connection.
Tilt upper part of air filter housing up and out - arrow -.

Fig 14: Identifying Bolts And Coolant Hoses

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Disconnect electrical connector - 1 - on Engine Coolant Level (ECL) Warning Switch F66 at bottom of coolant expansion tank.
Remove bolts - 2 - and - 3 - and lay aside coolant reservoir with connected coolant hoses - 4 - and - 5 -.

Fig 15: Removing Bolts & Disconnecting Electrical Connectors To Ignition Coils

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Remove bolts - 1 - and - 2 -.
Disconnect electrical connectors to ignition coils and press wiring harness to side.

Fig 16: Removing Ignition Coils Using Ignition Coil Puller T40039.

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Remove all ignition coils using Ignition Coil Puller T40039.
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	10.0 to 14.0
Wear limit	9,0
Difference between cylinders	max. 3.0

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

Install left upper part of air filter housing and right air filter housing → 24 - MULTIPORT FUEL INJECTION (MFI) .
Install spark plugs → 28 - IGNITION/GLOW PLUG SYSTEM .
As a final step, check Engine Control Module (ECM) DTC memory and erase it, since malfunctions were stored by disconnecting electrical connectors

Torque specifications

Component	Nm
Wiring for ignition coils at cylinder head cover	5