1990 BMW 3 SERIES battery

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Page 123 of 228

BMW 3 SERIES 1990 E30 Workshop Manual 6
Chapter 6 
Engine management and emission control systems
Catalytic converter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electronic Control Unit (ECU) - removal a

Page 125 of 228

BMW 3 SERIES 1990 E30 Workshop Manual Check
12Warm up the engine, and let it run at idle.
Disconnect the oxygen sensor electrical
connector, and connect the positive probe of
a voltmeter to the oxygen sensor output
connector terminal (ref

Page 127 of 228

BMW 3 SERIES 1990 E30 Workshop Manual filtered with a flame trap like most
conventional systems. There are no
conventional PCV valves fitted on these
systems - just a hose (see illustration).
3The main components of the PCV system
are the

Page 158 of 228

BMW 3 SERIES 1990 E30 Workshop Manual Refitting
7Refitting is the reverse of removal. Tighten
the nuts and bolts securely. Adjust the
drivebelt tension (see Chapter 1).
8Top-up the fluid level in the reservoir (see
Chapter 1) and bleed th

Page 165 of 228

BMW 3 SERIES 1990 E30 Workshop Manual 19After adjustment, screw the stop pads in
or out to support the bonnet in its new
position (see illustration).
20The bonnet mechanism should be
lubricated periodically with grease, to prevent
stickin

Page 166 of 228

BMW 3 SERIES 1990 E30 Workshop Manual 5Refitting is the reverse of removal. Align the
lid-to-hinge bolts with the marks made during
removal.
6After refitting, close the lid and make sure
it’s in proper alignment with the surrounding
pan

Page 167 of 228

BMW 3 SERIES 1990 E30 Workshop Manual 15 Latch, lock cylinder and
handles- removal, refitting
and adjustment
1
1Remove the trim panel(s) and, on the door,
the plastic shield (see Section 12).
Latch
2Disconnect the operating rods from the

Page 168 of 228

BMW 3 SERIES 1990 E30 Workshop Manual 19 Steering column shrouds -
removal and refitting
1
Caution: If the radio in your
vehicle is equipped with an anti-
theft system, make sure you have
the correct activation code
before disconnecting t