Compression Pressure, Checking

WARNING: This page is about a different car, the 2015 Audi RS 5, 2014 Audi RS 5, and 2013 Audi RS 5. 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:3122B
Compression Tester Kit:VAG1763

PROCEDURE

Fig 1: Automatic Transmission Fluid Oil Pan

Courtesy of AUDI OF AMERICA, LLC

Engine Oil Temperature: Minimum 30 °C (86 °F)
Battery Voltage Minimum 12.5 V.

-- Remove The Rear Noise Insulation -2-. Refer to NOISE INSULATION, REMOVING AND INSTALLING .

-- Disconnect The Connector -2- From The Engine Speed Sensor -G28-.

Fig 2: Disconnect Connector From Servotronic Solenoid Valve

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Ignore Item -1-.

-- Remove The Ignition Coils. Refer To IGNITION COILS, REMOVING AND INSTALLING .

Fig 3: Identifying Ignition Coil Puller T40039 Removing Ignition Coils

Courtesy of AUDI OF AMERICA, LLC

-- Remove Spark Plugs With Spark Plug Removal Tool:3122B .

-- Check The Compression Using The Compression Tester Kit:VAG1763 .

NOTE:

For Information On Using The Tester. Refer To The Operating Instructions.

-- Have A Second Mechanic Press The Accelerator Pedal All The Way Down While Operating The Starter Until The Pressure Increase Is No Longer Displayed On The Tester.

-- Repeat Procedure On Each Cylinder.

Compression Pressure	Bar Pressure
New	10 to 14 bar (145 to 203 psi)
Wear limit	9 bar (130 psi)
Maximum difference between cylinders	3 bar (43 psi)

Assemble In Reverse Order Of Disassembling. Note The Following:

-- Install the noise insulation. Refer to NOISE INSULATION, REMOVING AND INSTALLING .

-- Install The Spark Plugs. Refer To The Appropriate Service Information.

-- Install The Ignition Coils. Refer To IGNITION COILS, REMOVING AND INSTALLING .

-- If The Connectors Were Disconnected And The Engine Was Started, Then Malfunctions Have Been Stored In The Engine Control Module Diagnostic Trouble Code (DTC) Memory. Generate Readiness Code in Guided Functions Vehicle Diagnostic Tester.