Quote:
Originally Posted by Stretch
The OM615 is a bit of an oddity it does have a throttle valve controlling air going into the engine much like a petrol engine.
It certainly uses negative pressure in the intake manifold to control the "pig's bladder" (as it is often called on this forum) as part of the injection pump regulator / regulation. If this diaphragm breaks the tell tale sign is an engine that revs too high (but not run away).
I'm not sure what else is tapped off the intake manifold - best to find a workshop manual (which isn't likely to be easy unless you're prepared to pay Mercedes a lot of dosh)
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This is all correct. On my OM615, you can seen the gas pedal linkage connecting to the throttle valve (circled in red), with the vacuum line connecting to the fuel pump.
What's nice about this is that I can still shut the engine off even if the vacuum pump fails. It does make the gas pedal linkage much more complicated, though.