Smog help! VSD / EGR - JeepForum.com
 
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post #1 of 6 Old 10-30-2013, 04:44 AM Thread Starter
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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post #2 of 6 Old 11-05-2013, 09:19 AM
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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post #3 of 6 Old 11-06-2013, 08:49 AM Thread Starter
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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post #4 of 6 Old 11-08-2013, 05:05 PM Thread Starter
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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post #5 of 6 Old 11-08-2013, 06:29 PM
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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post #6 of 6 Old 11-08-2013, 06:33 PM
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Better information post #11;
http://www.jeepforum.com/forum/f8/ai...sensor-508819/

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