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#1
10-16-2011, 08:54 PM
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what is this vacuum device?
Is this just a large switchover valve?
It's always made noise and now it won't hold any kind of vacuum and is causing a problem with the transmission. Is it just a distributor? If so, then can I just bypass the thing? Didn't see any at the PNP today. Thanks, Jeff
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1984 300SD 300,000 miles--two tank WVO setup 2.88 diff & 500SEL anti-squat rear end 
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#3
10-17-2011, 03:10 AM
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Answer
It is a vacuum transducer, frequently used on the EGR circuit.
.
__________________
ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#4
10-17-2011, 09:24 AM
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My EGR is blocked off. There are a number of vacuum lines
that go to that transducer, besides the EGR, The line that goes to the VCV & tranny branches off and goes to the transducer. Can I just bypass or get rid of the transducer since it's leaking or should I replace it? Thanks, Jeff
__________________
1984 300SD 300,000 miles--two tank WVO setup 2.88 diff & 500SEL anti-squat rear end
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#5
10-17-2011, 10:12 AM
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Since you are running WVO you shouldn't be using EGR anyways.
-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#6
10-17-2011, 10:15 AM
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the mystery deepens
OK, my temp gauge suddenly stopped working.
Looking over the vacuum schematic I found online, I notice that the coolant temp sensor is included. The temp sensor works off of vacuum???? Temp sensor is connected to the "control unit" Is the control unit one of those vacuum pod reservoirs? Maybe I have a leaking reservoir? Car shuts off fine. Door locks work. Getting over 20hg of vacuum off the pump. Jeff
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1984 300SD 300,000 miles--two tank WVO setup 2.88 diff & 500SEL anti-squat rear end Last edited by Rooster300SD; 10-17-2011 at 10:19 AM. Reason: adding better image
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#7
10-17-2011, 10:17 AM
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The temp sensor goes to the EGR control unit. It turns off the EGR at low engine temps.
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#8
10-17-2011, 10:22 AM
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Is your car a Cal. version? Mine doesn't have such a device.
From the top, it appears to be fairly good sized. Could it possibly be similar to a vacuum booster? If so, you may need to repair it. There are a lot of good epoxy cements out there that could reseal it very easily.
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Sam 84 300SD 350K+ miles ( Blue Belle )
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#9
10-17-2011, 10:25 AM
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As roy noted that is the vacuum valve for the EGR valve. Disconnecting it disables the EGR and nothing else.
Doesn't the cluster temp gauge use a different sensor than the EGR computer? -J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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