Vehicles after change point in 1982
REMOVING AND INSTALLING IDLE CONTROL VALVE
(since 1985 Models)
Pull off plug (1).
Disconnect retaining strap (2).
Pull off idle control valve on hoses and
remove.

1341001 - click to zoom
 
Installation:
Check code number (1)*.
Check idle speed.


Siehe auch * See Specifications and Nominal Value Microfiche
1341002 - click to zoom
 
Note:
Whether or not the idle control valve is
running can be felt by taking hold of valve
with a hand (cycled power supply).
 
Mechanical Test:
The rotating piston (1) in the idle control valve
must move when turning the idle control valve
suddenly.

1341003 - click to zoom
 
Electric Test:
Measure resistance between terminals (1 and 3).
Nominal value: approx. 40 ohms.
Measure resistance between terminals (2 and 1)
or (2 and 3).
Nominal value: each approx. 20 ohms.

1341004 - click to zoom
 
Dynamic Test:
Remove idle control valve.
Plug remains connected.
Open rotating piston (1) completely, or close.
Turn on ignition.
Rotating piston must take on a position of
approx. 50% the cross section opening and
stay there.

1341005 - click to zoom
 
Testing Procedures for Idle Speed Surging and
Idle Speed of <=750 rpm, But Perfect (Checked)
Idle Control Valve:
Requirements:
Engine at operating temperature.
No leak in intake system.
Idle speed CO level* correct.
All equipment (lights, air conditioner, etc.)
switched off.
BMW service test unit or digital tester
connected.
There is no oil dilution.
Oil dilution = gasoline in engine oil; possible in
cold season of year and when car operated
chiefly in stop-and-go traffic.


Siehe auch * See Nominal Value Microfilm
 
Connect universal adapter between DME
control unit and engine wire harness.
Connect plug chambers (2/3/5) with each
other (idle and full load contacts closed).
Run engine at idle speed.

2812001 - click to zoom
 
Proceed with troubleshooting, if idle speed is
>=750 rpm (fault is not within the idle regulation
system).
 
If the idle speed is <=750 rpm, the throttle
valve basic setting must be changed.
Loosen nut (1).
Adjust connecting plate (2) with stop (3)
(engine running) until the idle speed is 800 -
50 rpm.

73313075 - click to zoom
 
Note:
If the fault is not eliminated after adjusting the throttle valve, the throttle valve must be returned
back to its original setting.
Cars with Active Carbon Filter Venting (US/ J):
There must not be vacuum in hose (4) at idle speed in spite of possible adjusted throttle valve
- check.

1341007 - click to zoom