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Old 11-19-2001, 02:06 PM
Chris_Silva
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odd problem on start up

Had this problem this morning on start up. Any input would be helpful
Car: 92 W140 M116 engine 110K By the book maint.
On start up this monring, the car stated as usual [ambient temp 40 farenheit] but idled at about 500 rpm. the ASR light was illuminated on the dash. when I gave the throttle a little nudge the throttle went down but the engine speed did not increase until another moment later when it revved very quickly to catch up the the position of the throttle pedal. I switched it back into park and shut t off and restarted it and it started as normal and ran fine. I drove the car about 1.5 miles and stopped for about 5 minutes and when I restarted the car, same problem. only this time, I was trying to drive the car and it simply would not move. I would depress the throttle and there would be no increase in engine speed until it would catch and spin the tires momenterily. I then shut it off, reselected park and restarted the car and it was OK again. I think the ASR illumination has something to do with this as the car behaves as if it was not getting traction in slippery conditions. I have only experienced the movement of the pedal with no result in very snowy conditions. I'm baffeled! Any BTDT's would be helpful.
TIA,
Chris
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  #2  
Old 11-19-2001, 04:09 PM
sixto's Avatar
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Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,745
Can't offer any help but I'm pretty sure a 92 W140 with a gasoline engine would have an M104 I6, M119 V8 or M120 V12.

Sixto
91 300SE
81 300SD
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Old 11-19-2001, 04:12 PM
Chris_Silva
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M119, right you are, should check my work...
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Old 11-19-2001, 06:42 PM
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Join Date: Sep 2000
Location: Sherman Oaks, CA
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First thing I would do is check fuses. Even if they look good, if they have never been changed int he car in its years, then might as well do it.

Its a minimal cost, and sometimes is the easiest way to fix a problem.

Though I would lean towards searching for OVP as this little relay will cause many many problems if the unit is faulty...

Do the research on OVP definately and if the fuses have never been changed int he car, might as well spend the few $$ to change em all.

I changed all of my fuses in my car for new ones the day I bought it.

Alon
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  #5  
Old 11-19-2001, 09:23 PM
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Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
Throttle actuator

I would bet on the throttle actuator being bad. On your engine, and mine, the throttle linkage actually moves a potentiometer rather than directly opening the throttle plate. The potentiometer alters the current flow to a motor which actually opens the throttle valve. This is so that when the ASR senses wheelspin and wants to cut the throttle, it can do so. As you know, if the rear tires are spinning, you can mash the accelerator to the floor and the engine speed won't increase.

When this assembly goes bad, the signs are: ASR light comes on and throttle assembly goes into "limp home" mode whereby you get no throttle response for the first 5/6ths of accelerator movement, then you do get some throttle response for the last 1/6th.

Mine has done this twice, and both times reset itself when I shut down and restarted. I'm probably living on borrowed time.

If you do a search on "throttle actuator" you will get some add'l info.

So far, it doesn't seem possible to rebuild these units. Unfortunate, since it's probably a $10 part but you have to replace the $800 assembly.
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