BMW 745i Repair Instructions page 59

Condition Cause
~
Check / Adjust
Engine does not start Fuel pump
Power supply/fuel in tank
- battery voltage okay -
Ignition Check ignition system with
BMW SERVICE TEST unit
Fuel injection electric connec- Make connections acc. to
tions loose or connected wrong wiring diagram
Cold start aid
Cold start relay, cold start
valve, temperature time
switch
I
Pressure regulator
Replace fuel pump, pressure
regulator
I
Control unit BMW SERVICE TEST
L-Jetronic test program
Poor cold starts Less than 8 volts at ignition Battery charge, terminal
- compression okay - coil term. 15 while starting
connections loose or ter-
minals corroded
Poor contact of wire from
Check plug connection
start relay to ballast resistor
Wire from battery via ignition Excessive voltage loss -
lock to ignition coil term. 16 eliminate
Cold start aid Cold start relay, cold start
valve, temperature time
switch
I
T'hrottle bypass valve Throttle bypass valve must
be open when engine is cold
Pressure regulator
Fuel pump, excessive fuel
consumption
Control unit
Check with BMW SERVICE
TEST unit
I
Valves
Adjust valve play
Engine starts, but stops again
Mu' l tiple-pin plug not connect-
Connect multiple-pin plug
ed
011
air flow sensor
Cold start enrichment Cold start relay, cold start
valve, temperature time
switch
A i r flow sensor
I
Pump contact
~
replace air
flow sensor
Pressure regu lator Pressure reg./fuel pump
Hoses Collector - throttle bypass
valve - brake booster -
fuel pressure regulator
CO level incorrect
\
Correct CO level
I
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