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Stupid Vacuum question 200 1984

posted by  Dick Slessig on  Sat Dec 5 11:22 CST 2020
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last visit: Wed Oct 22 15:14 CST 2014
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Ridiculously rookie question here, especially considering the fact that I've been working on this car since 2002, but where do the vacuum ports on the passenger side of an LH 2.0 throttle body connect? I've combed my Bentley, Haynes, and the OZ archive looking for a comprehensive map of the vacuum connections on this car to no avail.








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Stupid Vacuum question 200 1981

posted by  81242DLB21FCA on  Sun Dec 6 17:41 CST 2020
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last visit: Thu Oct 23 22:26 CST 2014
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These don't answer your question directly but may give a clue:

https://www.practicalmachinist.com/volvo9.jpg

https://volvoforums.com/forum/attachments/volvo-240-740-940-12/1278d1254079771-help-vacuum-hoses-8013.jpg







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Stupid Vacuum question 200 1984

posted by  planetman on  Sat Dec 5 11:49 CST 2020
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last visit: Fri Oct 24 09:29 CST 2014
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If you're asking about the 2 hose barbs for vacuum lines mounted on top of the throttle body, they both are for hoses that go to the charcoal canister that is mounted behind the bumper at the left front fender.

--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com








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Stupid Vacuum question 200 1984

posted by  Dick Slessig on  Sat Dec 5 13:48 CST 2020
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last visit: Wed Oct 22 15:14 CST 2014
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Here's what I'm talking about.
https://drive.google.com/file/d/16T9WuXeYZDnBNE9vExPlj0DC1yRrVoxO/view?usp=sharing








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Stupid Vacuum question 200 1984

posted by  planetman on  Mon Dec 7 21:32 CST 2020
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last visit: Fri Oct 24 09:29 CST 2014
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Ahhhh, a picture is worth a 1000 words!!

The hose for the rearward vacuum nipple goes to the flame trap/PCV fitting under the intake manifold.

The forward vacuum nipple is connected to a short piece of hose with in turn is connected to a small plastic tube that is routed under the engine crankshaft that is then connected to the vacuum sensor on the side of ignition computer. The ignition computer is located behind the right headlight under the hood.
--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com








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Stupid Vacuum question 200 1984

posted by  Dick Slessig on  Thu Dec 10 16:03 CST 2020
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last visit: Wed Oct 22 15:14 CST 2014
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Awesome, Thanks Eric.
I thought it went to the flame trap, but I was feeling around down there for a connection to no avail. Where is that extra joint in your forearm when you need it?







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Stupid Vacuum question 200 1984

posted by  planetman on  Fri Dec 11 19:59 CST 2020
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last visit: Fri Oct 24 09:29 CST 2014
[RELATED]

You might not find the small hose barb on the PCV/flame trap if the hose barb on the plastic PCV/flame trap fitting has broken off which is a common occurrence.

However, new fittings and flame traps are cheap and plentiful.
--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com







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