M104 Engine Front Crankshaft Sensor Purpose

dbmoylan

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Would anyone happen to know if the front crankshaft sensor on a M104.990 engine does anything? I inspected my front sensor and found the wire on the left side fender harness was cracked w/ the grounding touching the metal. However, I don't see it plugged into anything?? The sensor wire is in the bottom of a connector, that has a cap on the top & no plug that plugs into it??

I replaced the sensor w/ a spare I had (first time) for this sensor. I understand that the parts diagram shows a front & rear crankshaft sensor for my car (1993 Benz 300SE).

Any insight is appreciated. Thank you.
 

television

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This sensor I believe only goes up to the diagnostic socket, and not fitted to all cars. the rear one drives the engine managment
 
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dbmoylan

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Thanks Malcolm - yes it is part of the diagnostic socket. So I understand it does not serve any purpose for the ECU to analyze it's information.

Is there suppose to be a shim w/ the rear crankshaft sensor? I replaced that sensor and did not find any shim there. Car starts w/ no problem, just trying to eliminate a bit of sluggishness.
 
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television

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If no shim do nor worry, this device either switches or it does not, so this cannot affect the engine if it is running
 

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Wife had a e320 104 96 and i always thought it was sluggish, once wound up away it went, but from low speeds was not that powerful, then she got an ml320 with the 112 v6 engine and that was very lively at low speeds, her current w203 320 with the same engine is the same.
Maybe its just how they are?



Lynall
 
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dbmoylan

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Lynall, thanks for the reply. I would agree w/ you were it not for my random experience of its power on low end. I agree w/ power on high end though.

I've the 1993 M104.990 which is suppose to be pre-emmission controls that were placed on later models. Trying to stabilize its performance, and the camshaft sensor & rear crankshaft sensor may have helped a bit but am still on computer relearn phase (10 trips). Will hopefully report back w/ some positive results.
 


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