Bad Decel Valve Can Cause Engine to Die?

[73ess]

I'm looking at purchasing a '74 2.0 project car, but the owner says it has a problem. It dies in the middle of intersections. Almost got him killed so he stopped driving the 914. He said his mechanic thinks it's a bad Decel Valve. Would a bad Decel Valve cause the engine to die while accelerating? What's the purpose of this valve. Is it a costly component?

[pbanders]

It's easy enough to tell. Just disconnect and plug the vacuum lines to it. My guess is that the stalling behavior will continue, probably caused by something else (e.g. rich/lean idle mixture, bad MPS, bad trigger points, bad CHT sensor, etc.).

[73ess]

Ok. Where exactly is the Decel Valve? What does it look like?

[Dave at Pelican Parts]

Drawing of the DV (component #5):






Where it lives in the engine bay:


--DD