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-   -   M103 front TDC sensor (http://www.peachparts.com/shopforum/tech-help/241465-m103-front-tdc-sensor.html)

S-Class Guru 12-31-2008 02:15 PM

M103 front TDC sensor
 
I removed the front crank sensor to change the water pump.
I noticed the bracket has slotted holes that allow a few degrees of adjustmenton the sensor, maybe 3-4 crank degrees. Is this critical to final spark timing, or does this sensor just do a rough reference to aid startup?

DG

outofspec 12-31-2008 02:27 PM

I believe that sensor is for the tachometer. The crank position sensor is on the back of the block. Maybe someone else can verify this.

pawoSD 12-31-2008 02:46 PM

The front sensor is for the tach, I am quite sure. The computer reads from a sensor at the rear.

cudaspaz 12-31-2008 03:01 PM

Yeah, the top nut should be loosened to remove the sensor and leave the rest of the threaded post on the bracket.

These are usually rusted pretty good and need to be hit with some PB blaster a few times before removal.

Sometimes the top nut will not unscrew but the whole post will want to come off which is usually the case. Doh!

lkchris 01-01-2009 12:53 PM

Cam postion sensor at front, crank position sensor at rear.

stevebfl 01-01-2009 01:33 PM

All the cars crank inputs come from the rear sensor. The one on the front was designed for external testing and plays no part in the operating systems.

Carson357 01-01-2009 03:34 PM

Quote:

Originally Posted by stevebfl (Post 2064787)
All the cars crank inputs come from the rear sensor. The one on the front was designed for external testing and plays no part in the operating systems.

second that, it does not play a part in the car actually running, now for the older diesels it was for the tach. the car will run just fine even with it removed

wbain5280 01-02-2009 12:01 AM

Quote:

Originally Posted by stevebfl (Post 2064787)
All the cars crank inputs come from the rear sensor. The one on the front was designed for external testing and plays no part in the operating systems.

Right on (Steve) Bro!

S-Class Guru 01-02-2009 10:43 AM

Thanks guys. Now if I could just find a way to route the cable back behind the installed new water pump, as it's supposed to go, I'd be in great shape!

(Actually, I was able to unplug the other end and snake it around - I love getting old and dangerous!)

DG

dang50 01-02-2009 09:02 PM

Front TDC sensor
 
As I was looking at the power steering return hose on my 1990 300e 2.6 , I noticed the other end of this wire from this sensor lying loose on the inner fender. Where is the connector that it should be connected to located?
Dan

wbain5280 01-03-2009 12:24 AM

The wires inside the coax go to pins 7 and 8 and the shield goes to pin 9 on the X11 diagnostic connector. It serves no purpose than to signal cyl 1 TDC for some Bosch disgnostic equipment.


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