Compression Test

WARNING: This page is about a different car, the 2009 Volkswagen GTI and 2008 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Spark Plug Removal Tool -3122 B-
Ignition Coil Puller -T40039-
Torque Wrench (5-50 Nm) -V.A.G 1331-
Compression Tester -V.A.G 1763-

Requirements

NOTE:

Follow all safety precautions. Refer to SAFETY PRECAUTIONS .

The engine oil temperature is a minimum of 30 °C (86 °F).

The battery voltage is at least 12.7 volts.

Procedure

-- Remove the engine cover. Refer to ENGINE COVER .

-- Disconnect the electrical connectors -arrows- from the ignition coils.

Fig 1: Identifying Direction To Disconnect Ignition Coils Connectors

Courtesy of VOLKSWAGEN UNITED STATES, INC.

-- Remove the ignition coils using the ignition coil puller -T40039-.

Fig 2: Identifying Ignition Coil Puller T40039 To Remove Ignition Coils

Courtesy of VOLKSWAGEN UNITED STATES, INC.

-- Remove the spark plugs, using the spark plug removal tool -3122 B-.

-- Check the compression using the compression tester -V.A.G 1763- and the adapter -V.A.G 1763/6-.

NOTE:

Using the tester, refer to the operating instructions.

-- Operate the starter until the tester no longer indicates that the pressure is increasing.

Compression Pressure

New Bar Positive Pressure	Wear Limit Bar Positive Pressure	Difference Between Cylinders Bar Positive Pressure
11.0... 14.0	7.0	Max. 3.0

-- Install the sparks plugs. Tightening specification, refer to IGNITION SYSTEM COMPONENT OVERVIEW .

-- Install the ignition coils with power output stage. Refer to IGNITION COILS WITH POWER OUTPUT STAGES .

NOTE:

By disconnecting the ignition coil connectors, Diagnostic Trouble Codes (DTCs) are stored to memory. After the test, check the fault memory and erase, if necessary.

-- Read the Engine Control Module (ECM) DTC memory. Refer to the vehicle diagnostic tester.