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Vacuum tree on throttle body 850 1994

posted by  Metaphoric on  Sun Dec 4 09:19 CST 2005
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last visit: Sun Jun 1 14:49 CST 2008
[RELATED]

1994 850 Turbo wagon, 202K miles

Had a non-starting condition recently and found some vacuum problems. The engine would crank but not fire, and I found one loose vacuum line and one rubber elbow with a hole in it. The loose vacuum line, a heavily-insulated semi-rigid plastic line with a soft rubber elbow on one end and none on the other, was attached to what appears to be the crankcase vent, at the top rear of the engine, and was just hanging loose. The only place I could find to reconnect it was at the top rear fitting on the vacuum tree which sits on top of the throttle body. I replaced the soft rubber seal on the vent end and then fitted a length of 3/16" fuel line to the other end, on the tree, and the engine starts and runs fine now. At the front of the tree I found another soft rubber fitting with a hole in it, so replaced that with a length of 3/16" fuel line also. Pics of the completed job are posted on the Gallery under the Technical section, same Subject as this msg. I'll replace the cruddy fuel line material with proper fittings when I can get to a Volvo parts shop. The local Chinese Parts outlet, known around here as Retard Auto, didn't have the perfect stuff.

Question is: Did I connect the vent to the right location? Couldn't find anything else within reach of the length of line, and the outlet on the tree was sucking air, so it seemed logical. And it starts and runs.







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