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Discussion Starter · #1 ·
Once again I come to you guys for help regarding my 1995 isuzu pickup. 2.2 liter engine 4cyl. I checked all the other stuff and replaced the plugs, oxygen sensor, fuel filter. I had a guy look at it and here is where it gets weird. On the back of the block, there is this little cylinder type thing with three hoses coming out of it. Two of them go to a little disc type thing on the driver side of block. the other hose goes to manifold. the cylinder itself is not bolted down in anyway, just clipped into the frame. He took off one of the hoses and plugged the hole up on the cylinder and the truck started running like a champ. Put the hose back on and it started loping again. Any idea what this piece is? It measures approx. 2inches by 2 inches around and the hoses average in length 6-8 inches. About 1/4inch in diameter.
 

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Discussion Starter · #2 ·
Well, I looked at this little doo-dad, and when I pulled each hose off and plugged each hole, nothing happened. So apparently, my source was wrong. But while I was sitting there looking at it with it running, I heard what sounded like air escaping from a tire. On the passenger side of the block, I found a 6-8 inch hose that had a split in it. Figured that it wouldn't hurt so I crimped off the hose, and lo and behold the sputtering stopped! But when I called the parts house, they said computer only listed a radiator hose. Anyway, I figure that I can find a hose somewhere, but if anyone knows exactly what this hose does, let me know.
 

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That sounds to me like a vacuum hose (since vacuum leaks cause the engine to run rough). That hose might be for the pcv valve, or the charcoal canister (part of the emissions equipment). I'd take it off, go into the parts store and get a piece of hose that is the same size. Replace is, and see how things go. Be sure to ask them for vacuum host, not fuel line or something else. Some hoses will handle vacuum, some will just collapse.

-Tad
 
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