Compression, Checking

WARNING: This page is about a different car, the 2009 Audi TT and 2008 Audi TT. 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
Compression Tester V.A.G 1763

Test Sequence

NOTE:

Engine oil temperature min. 30 °C (86 °F)

Battery voltage at least 12.7 V

-- Disconnect the electrical connector on the mass airflow (MAF) sensor -G70- -3-.

Fig 1: Mass Air Flow (MAF) Sensor G70 Electrical Harness Connector, Clips & Front Air Intake Connector On Lock Carrier

Courtesy of AUDI OF AMERICA, LLC

-- Open clips -1 and 2- and remove air guide hose from MAF sensor.

-- Remove front air intake connector on lock carrier -4-.

-- Remove engine cover.

-- Remove the ignition coils with power output stage. Refer to Removal and Installation .

-- Remove spark plugs, using the 3122 B.

-- Disconnect 8-pin connector from fuel injectors. Refer to Removal and Installation

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

NOTE:

Using tester operating instructions.

-- Operate starter until tester shows no further pressure increase.

Compression Pressure:

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

-- Install sparks plugs.

-- Install ignition coils with power output stage. Refer to Removal and Installation .

NOTE:

By separating the connections, Diagnostic Trouble Codes (DTCs) are stored to memory. After the test, check the fault memory and erase, if necessary.

-- Read out ECM DTC memory. Vehicle diagnostic, testing and information system VAS 5051 in "Guided Fault Finding" function.