When went and tried to go through it on my old 240D, I found that the EGR valve didn't work (probably for a long time) and the stainless nuts and bolts holding it in had galled into one piece of metal. As long as their an EGR diagram on the sticker on the sheet metal under the hood and near the radiator and the vacuum routing seems to match it for inspection, just ahh. Well, you don't buy one of these because of the low emissions, except for C02 at least. At least check the EGR valve before going through some trouble.

To make sense of it, as I remember my federalized euro 82. It was probably imported in '85, as that's the only way NY would registers it, as an '85.

There was a mess of levers that operated a butterfly over the mouth of the intake manifold that was closed until maybe 80 or 90% throttle when it opened. This was to make manifold vacuum. The smooth operation of this complex mechanism was a testament to centuries of german clockmaking tradition.

There were 3 or 4 vacuum hoses and a push rod that went to a plastic box on the valve cover. One or two went to the thermostat housing, the other to vacuum supply. Another to the EGR valve.
If you opened it up, there was a rubber hose that got pinched off at full throttle.

I think the basic system operation was:
Wide open throttle disables EGR.
The EGR valve opens when the motor is warmed up.
The butterfly creates manifold vacuum so that the manifold sucks in the exhaust gas when the EGR valve opens.

__________________
CC: NSA

All things are burning, know this and be released.

82 Benz 240 D, Kuan Yin
12 Ford Escape 4wd

You're four times

It's hard to

more likely to

concentrate on

have an accident

two things

when you're on

at the same time.

a cell phone.

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