Compression Pressure, Checking

WARNING: This page is about a different car, the 2016 Volkswagen Beetle, 2015 Volkswagen Beetle, and 2014 Volkswagen Beetle. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Compression Tester Kit - Adapter 5AVAG1381/5A
Compression Tester Kit VAG1763
Compression Tester Kit - Adapter 6VAG1763/6 (replaces Fuel Injection Gauge Kit - CO Adapter VAG1381/1).
Spark Plug Removal Tool 3122B

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 -N70-, -N127-, -N291- AND -N292- .

-- Disconnect the connectors for Cylinder 1 Fuel Injector -N30-, Cylinder 2 Fuel Injector -N31-, Cylinder 3 Fuel Injector -N32- and Cylinder 4 Fuel Injector -N33-.

Fig 1: Identifying Connectors For Fuel Injectors

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Remove the spark plugs using a Spark Plug Removal Tool 3122B.

-- Check the compression pressure using the Compression Tester Kit VAG1763 and Compression Tester Kit - Adapter 6VAG1763/6 (replaces Fuel Injection Gauge Kit - CO Adapter VAG1381/1).

Fig 2: Identifying Compression Tester And Adapter

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

NOTE:

For information on using the tester, refer to the Operating Instructions.

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

Compression Pressure Description	Pressure Specifications
New	11.0 to 14.0 bar (159.5 to 203.0 psi)
Wear limit	7.0 bar (101.5 psi)
Maximum difference between cylinders	3.0 bar (43.5 psi)

-- Install the spark plugs, refer to => 14.2Spark Plugs, Replacing.

-- Install the ignition coils, refer to IGNITION COILS WITH POWER OUTPUT STAGES -N70-, -N127-, -N291- AND -N292- .

NOTE:

By separating the connections, DTCs are stored to memory. After the test, check the DTC memory and erase, if necessary.

-- If the connectors were disconnected and the engine was started, then malfunctions have been stored in the engine control module DTC memory. Generate readiness code in Guided Functions Vehicle Diagnosis Tester.