Checking And Adjusting Engine Idle Speed And Fuel/Air Mixture - BMW 745i Repair Instructions

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1300054 CHECKING AND ADJUSTING EN ·
GINE IDLE SPEED AND FUEL/AIR
MIXTURE
a) Engine Idle Speed:
Requirements:
Ignition timing correct.
Engine at operating' temperature (oil temperature at
least 60
0
Cor 140
0
F).
Electric equipment switched off.
Engine idle speed: 850.±. 50 rpm.
Connect' BMW digital tester according to operating
instructions.
Adjust engine idle speed with screw (1).
b) Fuel/Air Mixture:
Connect CO tester according to operating instruc·
tions.
Requirements:
Switch off the exhaust gas extraction system for
duration of measurements to avoid incorrect data.
CO level at 850.±. 50 rpm: 0.5 .. . 2.0 % by volume.
CO Level Too Low:
a) Leak in intake system (after air flow sensor).
b) Throttle bypass valve defective 11 61 090.
c) Fuel pressure regulator defective 13 51 200.
d) Fuel fi' l ter partially clogged 1332051 .
e) Fuel pump pressure - check 1331 029 .
f) Control unit - exchange for testing 13 61 000.
g) Function of fuel injection electric system -
check with tester 13 60 009.
Positions a) ... g) not cause of condition:
Remove cap (1) with a bent scribe or similar tool.
Correct the CO level with Special Tool 13 1 060
applied on idle air control
l
screw in the air flow
sensor .
19
J