opus Posted May 1, 2004 Share Posted May 1, 2004 I have an '69 GL wagon, 4wd with 275,000 on it. Finally started yanking on vacuum hoses today. What a difference in how it runs, wished I had done it earlier. What are the 2 big hoses on each side that have exhaust running through them? One is attached to a plastic box and the other to what looks like an overgrown fuel filter. A little exhaust comes out them and you can hear it as well. THought it kinda odd having exhaust running through a large vacuum hose. Glad I found this place....a wealth of knowledge. Opus Quote Link to comment Share on other sites More sharing options...
Aldoat Posted May 1, 2004 Share Posted May 1, 2004 From what I gather they are for the Air Suction Valves (ASV). Does one end of each connect to the air cleaner and the other to what look like a metal valves? The ASV is used to add oxygen to the exhaust stream before the Cat so that the Cat can work more efficiently. Do a search for ASV to learn more. Quote Link to comment Share on other sites More sharing options...
opus Posted May 1, 2004 Author Share Posted May 1, 2004 First off....I was a little wrong, it is an '86 model.....dont know where I come up with '69 model. Yes, that shounds like them. I will search it out. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted May 1, 2004 Share Posted May 1, 2004 The ASV system does not rob any power, and only serves to help your emmissions. You can block it off if you want to, but there's no need. It's not dumping exhaust into your air cleaner unless it's malfunctioning. It's actually sucking air into your exhaust. And yes, it's supposed to make that loud noise - that's what the big plastic things are there to muffle. GD Quote Link to comment Share on other sites More sharing options...
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