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Old 10-20-2001, 07:29 PM
BAd124's Avatar
German Car Enthusiast
Join Date: Aug 2001
Location: Colonie NY
Posts: 258
Question Stalling, Part ...........

Sorry to bring this topic up again as I see that it has been posted many times befor already. My stalling question is much like that of Donald with the 300ce only mine does it at no set times and only does it when I am coming to a stop. Has happened two times in the past month and prior to that one in april. When it does stall all I have to do its put it in neutral and it starts back up fine and runs normal. I have heard something about a "Hall effect sensor" of some sort. Does anyone have any idea what that part is? It could be the same thing as Don's problem but he noted that it stalls a few times afterwards and mine does not nor does it seem afftected by temp. Thank you greatly for any input.

88 300E
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Old 10-20-2001, 08:42 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
What car?
If it has CIS injection, I have repaired a great deal of them with replacement of the air flow sensor.
Donnie Drummonds
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Old 10-20-2001, 08:47 PM
David C Klasse's Avatar
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Hall Effect Sensor? TMK, that is a part in an Express (one touch) up/down window that senses when the window is at the end of it's travel!
You should try the OVP...!
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 10-21-2001, 12:29 PM
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Join Date: Sep 2001
Location: Lathrup Village, Michigan
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A hall effect sensor is generally used to indicate an event occuring with some frequency such as camshaft, crankshaft, or distributor position. It produces a square wave output corresponding to a magnitic field passing in close proxsimity to the armature of the sensor. It could also be used to detect wheel speed but more than likely, wheel sensors (like those for ABS) will be a variable reluctance sensor. This sensor would be pointing to a toothed wheel and generate a sine wave whose frequency corresponds to the rotation speed of the wheel. I believe that my 190E has one pointed at the teeth of the flywheel. If a wheel has a tooth missing, the waveform could also indicate a particular event such as top dead center.

If a hall effect was not working, the engine wouldn't stall at just idle. I would look at the air flow meter. I don't know if your car uses a vane or a hot wire to sense air flow, but if isn't working, the engine controller will give the engine the wrong amount of fuel and possibly stall the engine.

I had one car with a vane meter that would get oil in it and stick(from the turbo I guess) and not open correctly at idle. I would spray the vane with carb cleaner and it would be ok again.
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
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Old 10-21-2001, 11:52 PM
BAd124's Avatar
German Car Enthusiast
Join Date: Aug 2001
Location: Colonie NY
Posts: 258
Thank you for the input and sorry about the confusion. I forgot to state: 300E 1988 114,712 miles. Thanks again
88 300E
03 911 C4S
2008 Triumph Speed Triple

My pics -->
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