940 L4-2320cc 2.3L DOHC VIN 89 B234F FI (1991)
Compression Check: Testing and Inspection
Compression testing
Special tools: 9689, 115 8263, 175 8540
Ignition system
WARNING: The ignition system operates at high power, with dangerous voltages in both the low-tension and high-tension circuits.
Dangerous voltage levels occur in all parts of the ignition system, including connectors and similar fittings.
Measure compression at full throttle with engine hot
Normal value: 0.9-1.1 MPa (131-160 psi)
NOTE: Above value applies when engine is hot, throttle is fully open and engine is turned at 4.2-5.0 r/s (250-300 rpm) using starter motor.
Disconnect:
- lead from terminal 1 on ignition coil (to prevent flashover to electrical system wiring)
- injector connectors (to prevent flooding of engine and dilution of engine oil)
