Volvo Workshop Manuals
940 L4-2.3L SOHC VIN 88 B230F (1992)
Powertrain Management > Tune-up and Engine Performance Checks > Compression Check > System Information > Specifications > Page 5038
Compression Check: Testing and Inspection
TO TEST COMPRESSION PRESSURE:
Disconnect Coil Primary Lead
1. Disconnect electric cable from connection 1 on ignition coil.
CAUTION: On vehicles with electronic and transistorized ignition systems, connection 1 must be disconnected at the ignition coil. If ignition
2. Remove spark plugs.
3. Measure compression, with engine hot and throttle fully opened.
Min value: 0.9 MPa (128 psi).
Note: Applies to hot engine, fully open throttle and cranking with starter motor, 4.2-5.0 r/s (250-300 rpm).
4. Install spark plugs, torque to: 25±5 Nm (18±4 ft lbs).
NOTE: Results may be influenced by:
low battery voltage (affects starter motor speed).
tolerances in different measuring equipment.
carbon deposits in combustion chambers.
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