Compression test: General

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Testing Compression With Engine At Operating Temperature

Courtesy of VOLVO CARS OF NORTH AMERICA.

WARNING: The ignition system works with high ignition tension and dangerous voltage in both the low and high tension circuits. There are dangerous voltages throughout the entire ignition system including the connectors.

Test the compression with the engine at operating temperature and with wide open throttle (WOT)

The normal value for B4xx4Sx is 1.3-1.5 MPa .

The normal value for B4xx4Tx is 1.1-1.3 MPa .

The maximum difference between the cylinders must not exceed 0.2 MPa .

NOTE: Applies to engines at operating temperature, wide open throttle (WOT) and starter motor turning at 4.2 - 5.0 r/s (250 - 300 rpm).