Check to make sure the banjo on the back of the head is clear. Look for things that restrict fuel. Bypassing the over boost protection won't affect running. Mine never gets close to over boosting anyway.

Mach, how about coloring a wiring diagram if you need another project. That vac diagram is almost framing quality. It's purrrrrty!!

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

Thanks... When I was swapping things over from the donor car to the project car, I pretty much had to break things down system by system and component by component in order for things to make sense. To get the thing signed off I had to have all the smog stuff installed and working so color coding things was my way of sorting things out.

The wiring is all working....so don't hold your breath on that

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

You need to make this colored vacuum map a PDF file so folks can down load it....

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better

Right-click then save as

Attached Thumbnails

 

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

Thank you ! .

That worked easily .

I hope you make more of these....

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better

I hope I don't have to...

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

Thanks for all the replies just got back from a 1700 mile trip the 1st 400 were terrible had all kinds of problems with the switch over valve with the hoses popping off it as I stated previously the one little nipple broke off the valve and I finally super glued it back on but I nad to be very careful as to not break it while trying to attach the vacuum hose to it or you could be stranded hundreds of miles from home well not totally stranded but you could be in a situation where car will not go over 65 mph and when you are traveling on the thruways of now that is pretty bad. Never realized how important the switch over or change over valve is but will order a new one as not to have thjs trouble again. After the 1st 400 miles of trouble I got the little vacuum hose attached firmly that it was not leaking and the car ran fine for the rest of the trip and only burned about a gallon of diesel in 1700 miles rest was wvo. What I have to do is rebuild 2 front calipers as pads are wearing uneven and I have to get a new switchover valve. Thanks for the colored diagram mach 4 its a big help to figure this out.

From the Original Poster, in post #1: "I know the one line that comes from back of manifold goes to the port near the top and other line out bottom port goes to Alda."

Sorry to resurrect an old thread but for future readers please be aware that the OP's original setup is reversed. According to the diagrams in the previous posts, the line from the rear of the manifold goes to the BOTTOM of the switchover valve (boost pressure aneroid, part#126) and the line from the top of the switchover valve (bpa) goes to the Alda.

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1973 450SL
1984 300SD

Just to clarify - there are two nipples on top. The nipple that orients north/south is left open. The other which orients east/west receives a vac line.

tyl604: I concur. Thanks for clarifying.

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1973 450SL
1984 300SD