SL/R129: 91 300SL potentiometer where to buy?!
Thread Starter
Member
Joined: Jun 2011
Posts: 226
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From: Canada
2017 G63
91 300SL potentiometer where to buy?!
I Have finally diagnosed my hesitation and poor performance problem and traced it to my potentiometer, does anyone know where I can get this. Ive heard you have to buy the entire POT other have said you can get it seperate.
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Joined: Sep 2009
Posts: 12
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From: Brooklyn, NY
99 ML430; 91 500SL; 93 600SL; 97 S320; 2000 S430; 95 S600 coupe
I bought one 5 years back as a separate unit for my 1990 300E but heard that these pots are not available anymore, one has to buy whole assembly.
I repair throttle bodies for 92-95 MBs and they use very similar pots inside. Internal pots are not available but what I do is I bend those tiny spring loaded sliders to catch not worn area and it works. Customer is informed that this fix is a last resort as risk is high for sliders not to last long but so far nobody called for couple of years stating this repair failed. Basically, griphite wears off and contact is lost but griphite area is wider than sliders. If slider is moved a little to catch not worn area it will work again. You also want to make sure your pot is adjusted correctly in case you adjusted your air/fuel with fuel distributor tower. Also, there could be vacuum leak and your car hesitates on acceleration.
You can open your pot and try to VERY CAREFULLY bend those tiny sliders, it's very easy to bend them too much and deform them and you WILL need new assembly.
Victor
I repair throttle bodies for 92-95 MBs and they use very similar pots inside. Internal pots are not available but what I do is I bend those tiny spring loaded sliders to catch not worn area and it works. Customer is informed that this fix is a last resort as risk is high for sliders not to last long but so far nobody called for couple of years stating this repair failed. Basically, griphite wears off and contact is lost but griphite area is wider than sliders. If slider is moved a little to catch not worn area it will work again. You also want to make sure your pot is adjusted correctly in case you adjusted your air/fuel with fuel distributor tower. Also, there could be vacuum leak and your car hesitates on acceleration.
You can open your pot and try to VERY CAREFULLY bend those tiny sliders, it's very easy to bend them too much and deform them and you WILL need new assembly.
Victor
