Compression, Checking

WARNING: This page is about a different car, the 2017 Volkswagen Beetle. 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
Fuel Injection Gauge Kit - Adapter: VAG1381/1
Compression Tester Kit - Adapter 5A: VAG1381/5A

Test Sequence

NOTE:

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

Battery voltage at least 12.7 V

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

-- Disconnect the connectors for the fuel injectors:

Fig 1: Identifying Connectors For Fuel Injectors

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

For Cylinder 1 Fuel Injector -N30- to Cylinder 4 Fuel Injector -N33-
For Cylinder 1 Fuel Injector 2 -N532- to Cylinder 4 Fuel Injector 2 -N535-

-- Remove the spark plugs using a : 3122B .

-- Check the compression pressure using the : VAG1763 and : VAG1763/6 .

Fig 2: Identifying Compression Tester And Adapter

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

NOTE:

Information on using the tester. Refer to the Operating Instructions.

-- Operate the starter until tester shows no further 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 (43.5 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, DTCs will be stored. After the test, check the DTC memory and erase, if necessary.

-- The faults were stored in the engine control module DTC memories Generate Readiness Code in Guided Functions because the connectors were disconnected and the engine was started. Refer to Vehicle Diagnostic Tester.