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What is it? SOLVED - Vacuum Advance Cutoff Switch '72-74
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woodwerker
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PostPosted: Mon Sep 25, 2006 8:25 pm    Post subject: What is it? SOLVED - Vacuum Advance Cutoff Switch '72-74 Reply with quote

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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
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PostPosted: Mon Sep 25, 2006 8:44 pm    Post subject: Reply with quote

Teeny tiny electric fuel pump?? Doesn't look like a stock F/I part to me.
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Tram Premium Member
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PostPosted: Mon Sep 25, 2006 10:32 pm    Post subject: Reply with quote

It's an emission control switching valve (vacuum) IIRC.
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MalibuLX3
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PostPosted: Mon Sep 25, 2006 10:57 pm    Post subject: Reply with quote

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 Question
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woodwerker
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PostPosted: Tue Sep 26, 2006 6:22 am    Post subject: Reply with quote

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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PostPosted: Tue Sep 26, 2006 8:08 am    Post subject: Reply with quote

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."

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Any '72-74 Carb people out there?
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type2sam
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PostPosted: Tue Sep 26, 2006 8:24 am    Post subject: Reply with quote

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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