Hi everyone.

From the picture below from the 82 service manual. Has anyone ever seen one of these TVS mounted on the air cleaner on the V6 cars. I have been looking for one of these for weeks now and nothing. All the information I can find is from the second picture below of an air cleaner off I think a Buick and the discription below discribing the various parts. What I am looking for I think is number 3 on the picture.

Has anyone ever seen this air cleaner TVS? I have been searching the net for weeks and nothing. I am starting to go mad at this stage.

If anyone could shed some light, would appriecate.

Thanks.



1. Referred to as TES (Thermal-Electric Switch) in the service manual, this is a normally closed thermal switch. Sensing the air temperature inside the air cleaner, it OPENS at a nominal 65° F., informing the computer that the intake air is warm.
2. The breather filter for the PCV valve.
3. This temperature-controlled vacuum switch (TVS) is closed below 40° to 55° F. (nominal), preventing the EGR valve and evaporation canister from working when the engine is cold.
4. These are the intake tubes for the Pulse Air system. Notice that the right one is rusty, the result of a bad checkvalve which allowed the exhaust to burp soot and water back into the air cleaner (and carburetor).
5. This second thermal vacuum switch is part of the Thermostatically Controlled Air Cleaner (TAC) System. It controls a trap door in the air cleaner snorkel which routes heated air from the exhaust manifold heat stove into the air cleaner, depending on the air temperature. This provides faster warmup and better cold engine driveability.

 

There is a similar one for the 82 S10 pickup with the 2.8, GM part number 10012353 and Delco number 212230... Design may have changed between the printing of the manual 29 years ago and now, and you may have to guess as to how to hook it up, but you should be able to figure it out with the info from the service manual.

RockAuto.com has the info above, but the TVS has only one remaining, supposedly.

 

Ever think of swapping to efi, even a simple tbi system from an 86 up s10 would make it run good.

 

Thanks Maverick, I will have a look for one of those. I think it should have been used on the V6 engine until 86 when Fuel injection came out.

ex-x-fire.

Probaly a lot of work switching to EFI on an 82, have to order everything from the US. If I could get what I have inthe car working, I would be happy.

Thanks for your replys.

 

Probably easier to find it on carbureted V8 engines... The TVS was how the vacuum to the charcoal canister and EGR was controlled until the advent of the engine control computer system when emissions control standards were enacted in the 70s... Although there may be another kind that uses the coolant temp to determine whether to allow vacuum to the EGR and other parts or not. Which may be called a spark delay valve (keeps the vacuum advance motor on the distributor from receiving a vacuum signal until the coolant temp reaches a certain point). Not sure which would be easier for you to obtain being overseas.

And yes, switching to fuel injection would be a rather expensive pain in the neck... Even not using a stock computer, rewiring would be complicated and the parts themselves expensive to ship to the UK...

 

I will be ordering the TVS switch tomorrow. I can't find the specs on it though. From the manual, below 50 degrees F no ports connected, between 50 and 66 degrees F ports 1 and 2 connected, above 66 degree F all ports are connected. Hope the new switch will have similar specs. It is confussing that they are referred to a Ported Vacuum switches. All the manuals refer to them as TVS. I was typing TVS in my searches and was comming back with nothing that looked suitable.

Between the EGR valve and the vacuum from the carburetor there is a TVS on the front of the engine near where the coolant termostat is. Think it is to stop the EGR from opening until the engine has warmed up. As far as I know this is only used on the V6 engines.

Thanks.

 

You'll probably need to use the manual to figure out which port does what as there probably isn't any paperwork with the valve...

The coolant switch for the EGR is just another version of the delay valve...

The vacuum source for both the canister and the EGR is ported vacuum, meaning it's only fed vacuum when the throttle is opened, as opposed to something like the brake booster that gets vacuum full time (which is manifold vacuum).