Quote:
Originally Posted by Brian Carlton
With the 300D, it makes the most sense to eliminate all the lines to the valve cover because the 3/2 valves only control EGR.
We can do that for you, if you wish.
The function of the valve is as follows:
When the valve is "closed": The consumer (EGR) is connected to the vent line.
When the valve is "open": The consumer is connected to the vacuum supply line.
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Brian, I have a difficult time accepting that the operation is as simple as you describe. A purely binary operation (vacuum present or vacuum absent) would appear not to require the usage of two different valves which are both influenced by throttle position. These valves almost certainly have a specific function as it pertains to the shifting behavior of the transmission- which I don't currently understand.
Also - on the 1985 model, there is an electronic replacement for these valves - a device which is also influenced by throttle position.
I would be very interested to hear an answer from a Mercedes engineer who is familiar with the function of the device in question.