Engine Controls - Idle Speed Control Valve Binding/Noise

Group 13
Fuel Systems

Bulletin Number
13 04 97

Woodcliff Lake NJ
January 1998
Product Engineering

This Service Information bulletin supersedes S.I. 13 04 97 dated September 1997 which should be removed and discarded from your S.I. binder.

* Changes to this revision are identified by a asterisk *.

SUBJECT:

1) Idle Control Valve Binding - No Start

*2) Whistling Noise From Idle Control Valve

MODEL:
E36 with M44 engine

Situation:
1) The engine may not start or may only start with the accelerator pedal depressed (throttle plate open) due to a binding idle control valve.

*2) A whistling noise may be heard coming from the idle control valve with the engine at idle. *

Cause:
1) The air gap between the rotary slide valve and the idle control valve housing may be too small causing the valve to bind in the closed position.

If the valve binds in the closed position, throttle plate bypass air will be restricted during engine cranking thus causing a no/hard start condition.

*2) The whistling noise from the idle control valve is caused by unfavorable tolerances between the idle control valve housing and the rotary slide valve.*

New improved idle control valves have been phased into production on all M44 engines in 1/97.

Correction:
If the above customer complaints are received a new style idle control valve, part number 13 41 1 435 846, should be installed.

Note:
To avoid damaging the idle control valve when tightening the hold down bolts they must not be over torqued.

Tightening torque = 7+/-1 Nm (5 lb. ft.)

Parts Information:

Part Number Qty. Description
13 41 1 435 846 1 Idle Control Valve

Warranty Information:
Covered under the terms of the BMW Emissions and New Car Limited Warranties.

Defect Code: 13 41 O1 29 00

Labor Operation: 13 00 002
Labor Allowance: 2 FRU

Labor Operation: 13 41 500
Labor Allowance: 1 FRU