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woodwerker
Samba Member
Joined: September 02, 2004
Posts: 194
Location: Chicago
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 Posted: Mon Sep 25, 2006 8:25 pm Post subject: What is it? SOLVED - Vacuum Advance Cutoff Switch '72-74 |
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It has a vacuum port at each end, an adjusting screw, and two small/narrow blade connectors. On the body is stamped "A. Pierburg K G" and on the end with the adjusting screw there is an "F".
Any help would be greatly appreciated.
Last edited by woodwerker on Tue Sep 26, 2006 6:58 pm; edited 3 times in total |
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VDubTech
Samba Member
Joined: December 29, 2002
Posts: 9142
Location: Syracuse, NY
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| Posted: Mon Sep 25, 2006 8:44 pm Post subject: |
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| Teeny tiny electric fuel pump?? Doesn't look like a stock F/I part to me. |
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Tram
Samba Socialist
Joined: May 02, 2003
Posts: 22727
Location: Still Feelin' the Bern- Once you've felt it you can't un- feel it.
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| Posted: Mon Sep 25, 2006 10:32 pm Post subject: |
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It's an emission control switching valve (vacuum) IIRC.
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MalibuLX3
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Joined: October 02, 2005
Posts: 821
Location: Rochester, MI
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| Posted: Mon Sep 25, 2006 10:57 pm Post subject: |
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| Tram wrote: |
| It's an emission control switching valve (vacuum) IIRC. |
What the heck does that thing do, i've never seen one of them before 
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woodwerker
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Joined: September 02, 2004
Posts: 194
Location: Chicago
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| Posted: Tue Sep 26, 2006 6:22 am Post subject: |
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So it's part of the EGR circuit?
Ratwell's site says: "The early EGR valve has a vacuum hose for activation and an electrical connection which means the early FI system has a special harness in addition to it having a 6-pin AFM plug instead of 7-pin. The electrical connection leads to a microswitch on the throttle body which closes the valve at idle and WOT."
I remember seeing a microswitch on one of the throttle bodies I've salvaged. You think this valve is part of that setup?
Anyone versed enough in the EGR system to explain the correct connections? I have yet to come across a complete and working system here in the Chicago area. Everyone has the tubes blocked off and the throttle bodies in various states of dismemberment.
Last edited by woodwerker on Tue Sep 26, 2006 8:09 am; edited 1 time in total |
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woodwerker
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Joined: September 02, 2004
Posts: 194
Location: Chicago
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| Posted: Tue Sep 26, 2006 8:08 am Post subject: |
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Look what I found. Is that it in the picture? I had a '72 with the dual carbs.
From Ratwell's 72-79 Bus Engine Removal in 20 Easy Steps "2.4) 72-74 dual carbs: In addition to the booster fan, there is the vacuum advance cutoff switch that it mounted to the engine compartment ceiling using one of the bolts for the booster fan. Remove the wires that lead to the engine tin and the coil and disconnect the hoses that go to the distributor and the left carb."
Any '72-74 Carb people out there? |
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type2sam
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Joined: May 25, 2006
Posts: 57
Location: Boston, MA
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| Posted: Tue Sep 26, 2006 8:24 am Post subject: |
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I've got the same thing on my dual carb '73. Yes, it's the vacuum advance cutoff switch.
More details here:
http://www.ratwell.com/technical/VacuumHosesCarb/VacAdvCutoff.jpg
Go here (http://www.ratwell.com/technical/DualCarbs.html) and scroll down to the Drivability section for the details on its operation. |
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