W123

1977 280e Poor running performance

I have 1977 280e fuel injected gas engine. After many trials I have gotten it to the point that it will start and run...roughly. It back fires through the through the air cleaner when the throttle is stepped on. I have checked and the plug wiring is correct. If you slightly open the choke plate the engine evens out and runs smooth but still backfires when the throttle is cracked. I am thinking a possible vacuum problem exists although the power brakes seem to be great. Any thoughts would be great.

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1980 300D Won't Start

I replaced the starter about a month ago. The car started fine about a half dozen times and then stopped turning over altogether - not a sound when I turned the key after the glow plug light went off. Replaced the ignition switch yesterday after first having the starter tested to make sure it wasn't a dud (it wasn't). Started the car successfully five or six times without trouble, but am now having the same problem I had before: nothing when I turn the key after the glow plug light turns off. Any idea what's going on? I'm at a loss.

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1979 300TD transmission vacuum controls???

Hi all,

I've got a 1979 300TD non-turbo that isn't shifting correctly. I'd like to start out with the vaccum system, but can't seem to come up with a schematic.

I've got Kent's transmission tuning manual, but the transmission in the 1979 wagon looks to be different than any of those explicitly described in the manual, and the vacuum schematics in the appendix don't seem to match either.

I've got two questions:

What is (and how do I test) the item labeled "B" in this picture? (I assume it's the VCV)

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