3 Series E30 325i (M20) SAL
- all-season tyres, H-rated tyres, T-rated tyres depending on the model
- transmission ratio (4-speed automatic), the propshaft reaching its maximum speed at 206
km/h (128 mph).
Procedure:
Proceed as described below, taking into account the two restrictions mentioned above.
A)
General actions:
1.
In all cases, the catalytic-converter system must be exchanged for an appropriate front
silencer (muffler) without catalytic converter. This prevents annoying odours from the
build-up of hydrogen sulphide due to the higher sulphur content of leaded fuel ("smell
of rotten eggs").
Comment:
The method practised up to now (for reasons of cost), in which the catalytic converter
and oxygen sensor are left fitted in the vehicle, must no longer be used. This is due to
vehicle performance problems that arise either straight after conversion or at a later
date due to adaptive engine control.
2.
Remove the unleaded-fuel reduction sleeve from the tank filler neck or if the reduction
is fitted permanently, order the
reduction funnel:
Part no. 16 12 1 150 748
with holder:
Part no. 16 12 1 150 747
from the Parts department for future use with the vehicle.
As of the E36, it is also possible to replace the entire tank filler neck for the "cat-
prepared" version.
3.
Disconnect the electrical plug-in connection for the oxygen sensor and tie back and
insulate the sensor connector in the engine wiring harness so that it is protected
against water.
4.
Remove the oxygen-sensor heater relay - if fitted as standard.
5.
Set the idle CO as instructed in the Repair Instructions.
6.
For environmental reasons, the tank ventilation function fitted in all BMW vehicles
since 09/88, that uses the activated charcoal filter, should be left fitted in all vehicles -
i.e. in "non-catalytic-converter vehicles", too.
B.
Engine-specific actions:
The relevant encoding/programming actions must be carried out using the latest
"Programming" programme (on CD-ROM for downloading via the DIS or from diskette
via the MoDiC station to the MoDiC). The path to be selected is specified in the
respective engine-specific action.
1.
M20 B20/B25/B27
(since 09/85)
M30 B30/B35
M70
Leaded fuel, RON min. 91 /
MON min. 82.5
-
Recode DME control unit M 1.x to "cat-prepared" or "Gulf/Tropics" (path: "DME variant
code"; menu item: "Recoding"), so that tank ventilation via the activated charcoal filter
continues to be guaranteed.
SI Leaded fuel with catalytic-converter vehicles All models since Model Year 86
BMW AG - TIS
26.01.2013 10:41
Issue status (12/2007) Valid only until next DVD is issued
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