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Old 04-02-2006, 11:18 AM
Join Date: Dec 2005
Location: CA... No. of S.F.
Posts: 890
1980 300D Vacuum Diagram

My sincere thanks to whoever posted the vacuum diagram … “ Figure 423 ”

Q – Where did this come from ?

The diagram matches my 300D perfectly and the “( California version only ) ” stipulation on the diagram certainly makes sense here in No. CA for this car does have an EGR.

So as soon as I could, I went out and checked the vacuum lines and found that the green and red lines were reversed from what the diagram indicates which should clearly make a difference. I also found that I do have the 2nd restricted orifice [ No. “63” on diagram ]. I will test drive later today [Sunday].

Tomorrow [ Monday ] I will be at my mechanic’s shop where we will be flushing the “crud” out of the fuel tank to solve the repeated contamination of the preFuel filter. I also hope to have my new vacuum tester which together with the sections of hard vacuum line I should be able to monitor the vacuum at the various points while driving under load. I still think that I have internal trannie problems… but I’m determined to thoroughly test the vacuum control system before I go down that path.

Thanks again “orthotomeo… Planning advegturer ”,
Sam Ross // Novato, CA

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Old 05-06-2006, 04:12 AM
jrd jrd is offline
Registered User
Join Date: Jan 2000
Posts: 52
Orifice colors don't match the shop manual (stacked shifts)

The shop manual for my 87 300D shows blue and orange orifices, but all I have are red and green. I'm getting nowhere with the local dealer. I'm trying to iron out a stacked shifts issue.

At full throttle, 3-4 is nice and crisp, and at light throttle it is appropriately smooth 95% of the time. Sometimes, however, when accelerating at light throttle but riding the boost up through the gears and backing off the throttle I get a "stacked" 2-3 and 3-4 shift, wherein it shifts 2nd to 3rd and then 4th in rapid succession. Whenever the shifts are stacked, it flares between 3rd and 4th. When the shifts are not stacked, it never flares. If I hold the shift lever in 3 and then move it to D a second or two later, it shifts smoothly without flaring. Heavy boost and light throttle position seem to be the combination that causes it to misbehave.

I'm wondering if tightening the bowden cable would help with this.

The lines are definitely connected per the schematic, but the orifice colors do not match those in the schematic. They are not the originals either. The 603.960 California diagram shows a blue orifice at the injection pump VCV and at least two orange orifices. My setup has a green orifice and yellow in once place and another missing instead. Yellow doesn't seem to be an orifice at all, but rather a straight coupling. What colors are actually supposed to be there?


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Old 05-07-2006, 12:25 PM
Registered User
Join Date: Jul 2004
Location: central Florida
Posts: 59
Orifices for controling shift pattern on 722.314,5

I was able to get 4 or 5 of them from Caliber motors in Anaheim, Ca. awile back. they've got a great parts outfit only thing they tend to overnite anything you order which adds to cost. I've gotten green,blue,brown,maroon, and yellow. they call them vacuum nozzles I think. you can get them at 800 252 6877. hours are: 7:30 am to 6:30 pm pac time. hope this helps bubbaz

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