Compression, Checking

WARNING: This page is about a different car, the 2023 Volkswagen Atlas. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Special Tools

Courtesy of AUDI OF AMERICA, LLC

Special tools and workshop equipment required

Spark Plug Removal Tool:3122 B
Compression Tester Kit:V.A.G 1763
Fuel Injection Gauge Kit - Adapter V.A.G 1381/1:V.A.G 1381/1
Compression Tester Kit - Adapter 5A:V.A.G 1381/5A

Test Sequence

NOTE:

Engine oil temperature: minimum 30 °C (86 °F)

Battery voltage at least 12.7 V

-- Remove the engine cover. Refer to ENGINE COVER, REMOVING AND INSTALLING .

-- Disconnect the connectors from the ignition coil and remove them from the ignition coils at the same time.

-- Remove the ignition coil bolts and remove the ignition coils.

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

-- Check the compression using the Compression Tester Kit:V.A.G 1763 , Compression Tester Kit - Adapter 1:V.A.G 1381/1 and Compression Tester Kit - Adapter 5A:V.A.G 1381/5A .

Fig 2: Identifying Compression Tester And Adapter

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Refer to the => Operating Instructions for information on using the tester.

-- Operate the starter until the tester no longer indicates a pressure increase.

Compression pressure	pressure
New	11.0 to 14.0 bar (159.54 to 203.05 psi)
Wear limit	7.0 bar (101.52 psi)
Maximum difference between cylinders	3.0 bar (43.51 psi)

-- Install the spark plugs. Refer to => Spark Plugs, Replacing.

-- Install the ignition coils. Refer to IGNITION COILS WITH POWER OUTPUT STAGES, REMOVING AND INSTALLING .

NOTE:

By separating the connections, malfunctions will be stored. After the test, check and erase the DTC memory.

-- Connect the Vehicle Diagnostic Tester and select the following functions.

Engine control module, functions
0001 - Generate readiness code