Quote:
Originally Posted by LanzaroteSteve
Oh I've noticed that I've got a vacuum line that's not connected anywhere! If I suck on it it opens the butterfly valve on the air intake. It's about a meter and a half long so could connect to almost anywhere in the engine bay!! It is connected at one end to something under the expansion tank but I've no idea where the other end is supposed to connect. I can't see anywhere obvious where this should be but perhaps that's causing my idle issue.
|
That sounds like the resonance butterfly used to vary the length of the intake, if so there is a valve block linking the two together (two butterfly valves).
On the OM606 fitted to the W124 it's bolted to the underside of the intake manifold.
Regarding the erratic idle, re-attach the five earth points under the hood.
These can rust and give all sorts of issues, give me a shout if you need the location points - fairly easy to spot as small clusters of brown wires held with a single bolt to the tin.