Mike77

I am looking for info on the EGR-TCV Exhaust Gas Regulator- Thermal Contol Valve. My EGR is currently installed on a 1977 Oldsmobile 403 Cu. in. It is supposed to control vacuum to the EGR at 76*F. The TCV is missing.
I am trying to figure out were it goes and what it looks like. I do know there are EGR-TVS- Thermal Vacuum Switch (100*F) or an EGR-DTVS- Distributor Thermal Vacuum Switch (120*F). These are water sensing switches located in the water passage. I don't have a port available on my block to install a water sensing switch. The vehicle is 100% original.
This leads me to believe it may sense via air temperature.

Hoping someone might have a description of the the device, or a picture, a part#, or were I could source one.
I have tried many, many on-line sources and the usual GM/Oldsmobile part distributors with no luck. I am sure it is a common part to many GM motors of that era.
Thanks
Regards,Mike

crazy'boutOlds

I have three of them, used, on my shelf. Send me an email address and I'll send some pics your way.

Jim's rare 80

Do you have one like this?But with the tabs still on.https://classicoldsmobile.com/forums...1&d=1196078594

crazy'boutOlds

Are you asking me, or him?

Jim's rare 80

Sorry, I forgot to specify. I was asking you, Crazy, because you said you had three on a shelf. Mike comes first, of course. It is his thread.

crazy'boutOlds

Is that a three port or two?

Jim's rare 80

It did have two.

crazy'boutOlds

I'll check tonight after work. I think all mine have three.

Mike77

The picture is of a 2 port Thermal Vacuum Switch TVS. I looking for a Thermal Control Valve TCV. Same but different. Actually I don't know what it looks like. Mine is missiing.
Thanks for the info

crazy'boutOlds

My manual says it comes from manifold vacuum to the EGR. It's the one that sits on the timing case shelf. I have a couple if you can't find one.

Mike77

That's the one I'm looking for. I believe it just senses temperature, called a TCV.
When you say it "sits" on the timing case shelf are you meaning it does not thread into anything? The one in Jim's picture look's like it threads into the manifold or some place.
Thanks for the reply

crazy'boutOlds

Correct, it just sits on it. You should have a metal cover that goes over it, as well. I have both pieces if interested, used of course.

Mike77

You the MAN!
Yes I would be interested. Both parts. PPM if you would.
thanks!

crazy'boutOlds

I'm going to email you some pics, ok?

Brezzy3304

Hi can U send me a few pics of it too, would be appreciated

joe_padavano

This thread is from 2007. That member last logged into the site in 2020.

Brezzy3304

Hi would u happen to still have those pieces, or would U be able to send me a pic of them, would be appreciated