Preliminary Information
WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
High tension - mortal danger!
Cut off power supply to ignition coils (disconnect plug connection at DME control unit).
Necessary preliminary tasks:
- Connect charger or a second battery.
- Read out fault memory of DME control unit
- Pull fuel pump relay or fuel pump fuse.
- Start engine and allow residual fuel to drain out (pressure reduction).
- Remove all spark plugs. 12 12 011 REPLACING ALL SPARK PLUGS
IMPORTANT:
Check Schrader valve on special tool 11 0 226 for tight fit.
Screw special tool 11 0 226 by hand into spark plug thread and connect special tool 11 0 224.
NOTE:
Check that sealing ring is in perfect condition (see arrow).
Depress accelerator and actuate starter until compression stops rising.
Compression pressure.
Assemble engine.
Now clear the fault memory.