Compression, Checking: Procedure
WARNING: This page is about a different car, the 2016 Audi A3 and 2015 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.
- Engine oil temperature at least 30 °C (86 °F).
- Battery voltage at least 12.5 V.
-- Remove the engine cover. Refer to ENGINE COVER, REMOVING AND INSTALLING .
-- Disconnect the connector on the Fuel Pressure Regulator Valve - N276- -2-.
-- In order to reduce the fuel pressure in the high pressure reservoir, start the engine briefly.
-- Remove all glow plugs. Refer to GLOW PLUG, REMOVING AND INSTALLING .
-- Install the : VAG1763/8 in place of the glow plug and connect the : VAG1763 .
-- Have a second technician operate the starter until the tester stops displaying a pressure increase.
-- Repeat the procedure on each cylinder.
| Compression pressure | BAR Pressure |
|---|---|
| New | 25.0 to 31.0 |
| Wear limit | 19.0 |
| Maximum difference between cylinders | 5.0 |