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#16
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#17
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You need to prise off the plastic covers at either end of the front face of the potentiometer. They protect four screws which you can loosen to allow adjustment of the unit without removing it. I've just been messing with mine in a bid to sort out a rough idle and swapped it with a known good one. Turned out it wasn't the unit that was faulty but the two prongs inside were not making contact with the inner face of the pot. So, although the idle problem sees to have gone away (again) I suspect my Idle Control valve is faulty as I have been unable to make it move inside, even when applying current to the contacts. Anyone have any experience of testing these things?
As for replacing the pot, it is apparently available as a separate unit as a Bosch part, but not here in Indonesia where you would need to either buy secondhand or replace the entire air flow sensor unit. I've read in other forums that you can get the replacement part for $47 from Halsey Imports in the US, who apparently are only reachable by phone. I've got the info at home so if you need the part number let me know. Good luck |
#18
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bosch part number (not OEM)
here you go
3437224035 |
#19
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Thats about the same price that i got from my MB dealer here in Umeå, Sweden, today when I went to check the price for an new one... Quite expensive i would say |
#20
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Probably solved now...
If seemed that the problem was the contact of the connectors at the microswitch, not the switch itself that was the problem. Now the car idles fine! :-) Thanks everybody! :-) Edit: English and spelling errors... ;-) Last edited by Sundman; 06-18-2004 at 07:25 AM. |
#21
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The microswitch or the TVS?
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#22
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Do you mean that the problem was at one of the wire connectors to the microswitch? Feedback is important on this issue because idle problems are common, and the "things to check" responses are all over the map. Duke Last edited by Duke2.6; 06-17-2004 at 11:47 AM. |
#23
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With all the technical imput here, I know this answer sounds silly, but I had a problem like that once on a client's 91 300E. It always idled at about 1100 in park. I too checked everything and finally solved the problem with the advice the Germans hammered into me when I was serving my apprenticeship. They told me that sometimes one drop of oil can take the place of 3 mechanics. I solved my problem by taking ALL the linkage apart and lubing it. That means removing the levers from the shaft. The car idle was returned to normal. It's worth a shot.
Peter
__________________
Auto Zentral Ltd. |
#24
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#25
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Thanks for the clarification. I cannot in good conscience critize your English, because I don't speak a work of your language.
Duke Last edited by Duke2.6; 06-18-2004 at 03:00 PM. |
#26
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Oops. I guessed I overlooked the closed with fix part, before I blithered on about the lubrication.
Peter
__________________
Auto Zentral Ltd. |
#27
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#28
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Mine idled normally after cleaning the switch, but the problem returned after a day or two. A new switch permanently corrected the problem.
__________________
2008 E350 4matic / Black/Anthracite ------------------------------------ Gone but not Forgotten: 2001 E430 4matic, 206,xxx miles, Black/Charcoal 1995 E320, 252,xxx miles, Black/Grey 1989 260E, 223,00 miles, Black/Black |
#29
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