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unknown vacuum hose

1K views 4 replies 4 participants last post by  benzzy 
#1 ·
From the vacuum control valve next to the ALDA there is a Y conector from which one vac line runs up to the central vacuum connector on top of the valve cover, the other (black line) goes through the firewall. Mine is not connected to anything under the dash, what is is supposed to connect to?
 
#2 ·
does the heating have all its vacuum pipes connected?? does you car have a gauge in the dash for ecconomy, does the pipe have suction when the engine is running?? if not it could be a vent pipe if it does then its a feed for something, if you cant find what its for and it does have suction then blank it because it must be effecting the performance of the engine
 
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