M104 idles low when cold - Page 2 - Mercedes-Benz Forum
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post #11 of 15 (permalink) Old 11-22-2016, 08:31 AM
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yeah, thats a throttle body we never saw on this side of the pond. without CC, it probably has fewer wires than our CC/ISC version.


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post #12 of 15 (permalink) Old 11-22-2016, 10:02 AM
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Would a replacment engine temp sensor help .It send a message to the computer that engine is hot .But is running cold .I could be stuck .Then computor thinks its at normal working temp ,so then no enrichment
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post #13 of 15 (permalink) Old 11-22-2016, 10:35 AM
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the ECT (engine coolant temp sensor) is easily tested with an ohm meter. warm the engine up, unplug the ECM, and test it at the ECM plug while the engine is still warm, wait for it to get cold, and test it again. if its anywhere close to spec, its good. ECM connector 2, resistance between pins 28 and 36. With the engine hot, it should be a value like 200 ohms. with it at 20C/68F, about 2500 ohms. 0C/32F, like 6000 ohms.
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post #14 of 15 (permalink) Old 11-23-2016, 12:30 AM Thread Starter
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@sbaert : I am now sure throttle body is OEM but it works fine and wires feel smooth, not like the ones w/o insulation (checked in a junk yard on a filthy W220)
@Earl.Allen : You got away cheap. Mee too, as you'll see below.
@LeftCoastGeek : 4 wires or so; good thing is wiring is fine and thanks for the info about ECT! I was looking for that! Not too late to cancel the order I placed for a new sensor.
@Trevor Hadlington : my thoughts exactly but no, not this time.

But we all forgot the Boogie Man! Me first! Who is he when we are working on a W124?
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post #15 of 15 (permalink) Old 11-23-2016, 10:34 PM Thread Starter
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I will answer my own question:

It was the protection relay (OVP).

I replaced it with a good used one and car starts at 1300 rpm, after few seconds goes down to 1100rpm and stays there until it warms up then slowly drops. Also idle doesn't drops rapidly anymore between gear changes. Great people and great source of info on this forum!

Thank you everybody !
Regards from Romania.
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