Hello,

I am planning to swap an M104.980 motor into my 190E 2.6. I'm currently going over the M104 motor and a question came up.

Regarding the EZL on a 91 300CE, where does this dusty 8pin connector run to?

http://imgur.com/a/bIyBC

I know the other 8 pin connector runs to the main engine wiring harness. I traced the connector in question and it looks like it runs into the fuse box.

Do I need to swap my fuse box as well or is there something in particular that this 8 pin connector runs to so my work is easier?

Thanks,
John

I did some more research on the subject. Here are some interesting diagrams: http://imgur.com/a/s3IfC

The first two photos are for the M103, while the second two are for the M104. We are concerned with connector 4 (M103) and connector A (M104). It looks like they share the same 4 basic signals:

- Terminal 15
- Ignition Coil Terminal 1
- TD/TN signal
- Terminal 31 Ground

There are 3 extra signals on the M104 EZL which are:

Pin 5 - Negative, position sensor/cylinder recognition
Pin 7 - Pulse output
Pin 8 - Camshaft position (L5/1) signal output

The new question is, can these 3 pins be safely left unconnected? If that's the case, the solution becomes simple and we can just splice the old EZL wires from the 190E into the new 8 pin connector from the 300CE.

The m104 as coils on the plug . The m103 will have only one coil so ezl are not the same . But you know that dont you
This must have been done before .
Keep looking in .

The differences between the two EZL modules in question is that the 104.980 module has CAN communication with the engine ECU, it has knock sensors, and it has a cam position signal to figure out which cylinders are knocking.
I'd want all of that working.

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

The M104.980/1 has a single coil and standard distributor in a separate ignition/fuel config. The later M104s have coils on the plugs as you suggest.

RayH