Should this be connected somewhere?? - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 11-22-2012, 04:24 PM Thread Starter
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Should this be connected somewhere??

1972 250/8 There are two vacuum nipples on the diaphram that is connected to the distributor. One has a hose going into one on the zenith carbs, the other
nipple is open, with nothing connected to it. Should it be connected or at least plugged up? When I cover it with my finger, I dont seem to notice
any change when the engine is idling. Thanks guys.
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post #2 of 7 (permalink) Old 11-22-2012, 07:46 PM
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That hookup is to retard the timing when you let off the throttle. It should be hooked up on the pass fender.

'71 250C "work in progress"
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post #3 of 7 (permalink) Old 11-23-2012, 04:47 PM
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you are better of not to use the vacuum at distributor , make sure the mech advance in distributor works , set the timing at 5 to 10 deg advanced at idle , the engine will be more responsif and will run cooler .
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post #4 of 7 (permalink) Old 11-24-2012, 08:21 AM Thread Starter
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Thanks for the quick response guys! Has anyone else removed the vacuums from the distributors from thier cars and what were the results? It seems to me like after I hooked up all the vacuum lines as per the diagram (thanks r34sklnns!) the car was running a lot better.
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post #5 of 7 (permalink) Old 12-27-2013, 08:39 AM
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this is the vacuum retard , this is strickly a smog issue , dont connect . set timing at 5 to 10 deg btdc accelerate to about 3500 rpm , you should have around 35 , if you do , you are done , the car will run better that way .
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post #6 of 7 (permalink) Old 12-27-2013, 10:44 AM Thread Starter
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Agillot, thanks again for the info, I will try right now and report back. I am getting an intake backfire only when the engine is cold. Once warmed up and have driven about a mile, the backfire goes away.
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post #7 of 7 (permalink) Old 12-27-2013, 11:37 AM Thread Starter
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Agillot, I just want to be sure about the ADVANCE vacuum, should that one be disconnected as well?

The timing was at 15 before TDC, I adjusted the distributor to 10 degrees before TDC and it seems like
the backfire issue is no longer. Keep in mind, when I took it for a run, I did not have the advance vacuum hooked up either.

Last edited by Luna Gaudi's 72 250; 12-27-2013 at 11:40 AM.
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