BMW 745i Repair Instructions page 61

Condition
Cause Check / Adjust
Fuel consumption excessive
Cold start valve
I
Temperature time switch de-
(cont' i nued )
fective, cold start valve leaks
Fuel injectors leak
Replace fuel injectors as
I
~.
necessary
Control unit
I
Check with BMW SERVICE
I
TEST unit
CO level incorrect
I
Correct CO level
Misfiring Ignition
Check ignition -system with
BMW SERVICE TEST unit
-
Valves Correct valve play, valves leak
I
CO level incorrect
I
Correct CO level
I
Pressure regulator
I
Fuel pressu re too low,
return line squeezed, misrouted
vacuum hose not connected
Fuel filter
,
Seriously clogged
Air flow sensor Poor contact on slide of poten-
tiometer, contact broken
Control unit Check with BMW SERVICE
TEST unit
Backfiring Distributor
I
Retard timing control malfunc-
tions, distributor arm resistanc e
Exhaust valves Replace
Exhaust assembly
I
Damaged
I
Control unit
!
Check with BMW SERVICE
I,
II
TEST unit_ Fuel not switched
i
off above 3,000 rpm
I
Temperature switch 45
0
C
,
Break in power feed wire,
(113
0
F) replace temperature switch