Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2004320I (E46) (CANADA) L6-2.2L M54REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTUNE-UP AND ENGINE PERFORMANCE CHECKSCOMPRESSION CHECKTESTING AND INSPECTION
2004 BMW 320i (E46) (CANADA) L6-2.2L M54
Compression Check: Testing and Inspection
2004 BMW 320i (E46) (CANADA) L6-2.2L M54SECTION Testing and Inspection
Checking Compression Of All Cylinders
- Read out fault memory of DME control unit
- Check stored faults
- Rectify faults
- Clear fault memory
Disconnect fuel pump relay or fuel pump fuse.
Start engine and allow remaining fuel to escape.
This prevents fuel from being injected, the catalytic converter from being damaged and the test result from being distorted during the compression pressure check.
Caution: High voltage - mortal danger!
Disconnect all supply leads from ignition coils (interrupt power supply to ignition coils).
Remove all spark plugs Service and Repair
Screw special tool 11 0 226 by hand into spark plug thread and connect special tool 11 0 224.
Note: Check that seal is in perfect condition.
Depress accelerator and actuate starter until compression stops rising.
Compression pressure
Now clear the fault memory.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.