C3 egr valve part number

[Steve King]

Does anyone know the egr valve gm part number for a 1980 L-48? And where can I get one?
Steve

[Joe L.]

Re: C3 egr valve part number

Steve-----

I've got some good news for you, some bad news, and, then, some more good news:

First, the good news: if you have an 80 L-48 WITH AUTO TRANSMISSION, the original PROIDUCTION valve was GM #17064059 (never available in SERVICE). The last available SERVICE valve is GM #17113414. It's still available from GM to this very day. It is configured slightly different than the original valve but it's 100% functional;

Next, the bad news: if you have an 80 L-48 WITH 4 Spped, the PRODUCTION valve was GM #17062706 (never available in SERVICE). The last available SERVICE valve was GM #17066862. It's been discontinued for quite awhile and is diffiult to locate in NOS condition (which is how you want an EGR valve unless therte is no other way than used).

Now some more good news: many of these EGR valves are available in the aftermarket from sources like NAPA, Echlin, Standard Auto Parts, and Borg-Warner. They, too, will be configured slightly different than the originals, but they'll also be 100% functional.

[Joe L.]

Addendum

Steve-----

One other thing: if you currently have a valve, but you think that it's shot, that may not be the actual case. There are, basically, 2 things that go wrong with these valves:

1) The vacuum diaphragm fails. This means that the valve is scrap; it cannot be repaired;

2) The valve tip becomes "stuck" due to carbonization. This is a common failure mode and the valve can be repaired. Clean the valve orifice at the manifold flange. Use a wire wheel and Dremel tool to clean all around the orifice and the valve tip, itself. Usually, if this is the problem, this will restore the valve to functionality.

You can test a valve after cleaning by applying vacuum to the vacuum port. If the valve stem moves and the valve opens and closes, you're set to go. If it doesn't, then that likely means that the vacuum diaphragm has failed and the valve is irrepairable.

I'll bet that more than half of these valves that have been removed and discarded were just fine and only required cleaning of the valve tip and orifice. If we could only find those valves....

[Steve King]

Re: Addendum

My car is an auto so I should not have any problems finding one. Thanks for the information.
Steve