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Originally Posted by Samuel M. Ross
Let me speculate some…
(1) first off the 11 inches seems a bit low to me,
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I know it should be a tad bit higher. What specifically would I do to raise vacuum at idle?
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(2) you started out with what was probably a dirty 2mm orifice, and
(3) you replaced with a new 0.8mm orifice.
Something just does not quite jell here...
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I just compared the orifice from the car with the new 2mm orifice I bought. Other than one being a bit dirty, they're identical. That is, the old one does not appear to be constricted by dirt at all.
Keep in mind that the PO had cut out big chunks of the vacuum system. The vacuum goes directly from the supply line, through the spaceship and into the VCV.
That is, on this diagram:
http://home.comcast.net/%7Ephantoms/vacuum/fuel_egr_240d_auto.jpg
I replaced the orifice at 62 (yellow to green) and the line out of 62 is going directly into 72.
You can see in the attached picture what I'm talking about. The yellow stripe in the line just above the green spaceship is the old orifice.
Would all of this make any difference in the expected result of the replacement I made?
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PLEASE measure and report back to us what the vacuum now is at idle and what it drops to when you put “the pedal to the metal” ?
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OK, will do.
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Also... I think the full range of 6+ orifices are still available !
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Well, not according to the parts guy at the Benz dealer nearest me. I read him the list of part numbers (which I got here) and all but those come back as unavailable in the computer system.