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Unread 10-30-2013, 04:44 AM   #1
BigBlue77
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Hi. I have an 80 cherokee Laredo that has the 360. I've followed the vacuum diagram to a tee until I've reached the 'VSD'. I see by the diagram it ties into a tee and goes to the egr valve. HOWEVER, all I have is a vacuum hose at the tee. It goes to nothing. Does anyone know what the VSD looks like and what it does? Thanks

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Unread 11-05-2013, 09:19 AM   #2
laybackman
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Is this the bad boy;



Found it here at post #1516;
http://www.jeepforum.com/forum/f8/wo.../index102.html

It is a Vacuum Sense Dump valve. I'll bet many 1980's vehicles had them as part of their EGR system.
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Unread 11-06-2013, 08:49 AM   #3
BigBlue77
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Thank you. I appreciate your help! I was actually able to read up on that. I found this one on eBay. The seller says he tested it and it dumps below 5 inches. I couldn't find the specs so hopefully that's what's it's suppose to do. I'll post after it arrives and let you know how it works out. Not that I may or may not notice a difference! Thanks for taking the time to reply! Adam

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Unread 11-08-2013, 05:05 PM   #4
BigBlue77
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Ok. So today the part arrived and low and behold it looks exactly like a part already on the Jeep. Yup, in an idiot! ANYWAY,,,apparently I need an EGR TVS.(Thermal vacuum switch) part B on this diagram. Anyone know where to get one or what it looks like in real life? Thanks, Adam

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Unread 11-08-2013, 06:29 PM   #5
laybackman
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I'll get you a bit closer;
Post #12

http://www.jeepforum.com/forum/f8/ai...parts-1141414/
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Getting older, I have developed some special skills. I have the ability to cough, sneeze, fart and pee at the same time.

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Unread 11-08-2013, 06:33 PM   #6
laybackman
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Better information post #11;
http://www.jeepforum.com/forum/f8/ai...sensor-508819/
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Getting older, I have developed some special skills. I have the ability to cough, sneeze, fart and pee at the same time.

"If we cannot afford to take care of Veterans, then we should stop making them."
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