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
Compression Tester V.A.G 1763

Procedure

Engine oil temperature at least 30 °C / 86 °F.
Battery voltage at least 12.5 V.

-- Switch off ignition.

-- Remove E-box cover by slide both latches in direction of -arrow-.

-- Remove Fuel Pump (FP) 2 Relay -J49- -2.1- and Fuel Pump (FP) Relay -J17- -5-.

Fig 1: Component Location For Secondary Air Injection (AIR) Pump Relay J299

Courtesy of AUDI OF AMERICA, LLC

-- Remove ignition coils. Refer to Removal and Installation .

-- Remove spark plugs with Spark Plug Removal Tool 3122 B.

-- Check compression pressure with Compression Tester V.A.G 1763; => Operating instructions.

-- Have a second person completely depress gas pedal and operate starter long enough until tester no longer indicates increase in pressure.

-- Repeat procedure on each cylinder.

Compression pressure	Bar pressure
New	10.0 to 13.0
Wear limit	7.0
Maximum difference between cylinders	3.0

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

-- Install spark plugs. Refer to 810 Service Procedures.

-- Install ignition coils. Refer to Removal and Installation .

Because the relays were removed, malfunctions were saved in the engine control module.

-- Connect Vehicle Diagnosis, Testing and Information System VAS 5051B.

-- Start "Guided Functions" operating mode.

-- Generate readiness code in ECM.