Trying to identify an engine part

[Steeveedee]

Note that you should use straight pipe plugs, if you haven't found that out already. The tube fittings are not tapered. If you really want to not be concerned about a "violation", just swap out that exhaust manifold for one without the fitting provisions.

The A.I.R (Air Injection Reactor) pump was used to provide air into the exhaust until the engine warmed up, to help combust the rich mixture during warm up. Once the thermal vacuum switch (TVS) closed when the engine was warmed up, the pump no longer sent air into the exhaust. Keeping it "legal" would also involve removing the TVS, as that would be further evidence that the A.I.R. system had been present and removed.

Back in those days, I was a California State licensed smog tech.

[barmanvarn]

Good info.

I'm not worried about any violations here in AR.

Out of curiosity, where is the TVS located?

[barmanvarn]

Good info.

I'm not worried about any violations here in AR.

Out of curiosity, where is the TVS located?

[SS Tim]

Not just a California thing. This is right out of the 69 GMC service manual. Need to look into it but I don't remeber the early systems being temp regulated at all. Just basically running all the time.
If you don't have one, download the service manual for your 69. It can only help.


* VIN/Model Decoders
* Power Team Charts (engine/transmission/gear ratio)
* Post Your Pickup SPID Blazer SPID Suburban/Panel SPID
* RTFM ... Read The Factory Manuals... download 'em here

[barmanvarn]

Oh wow!

Had no idea these manuals were available.

thanks! Now I have 500+ pages to review. LOL

[barmanvarn]

Picked up threaded inserts today at ACE to plug the holes. And my radiator should be fixed by this weekend. (fingers crossed)

[SS Tim]

Originally Posted by barmanvarn

Picked up threaded inserts today at ACE to plug the holes...

Agin, as Steve mentioned above, make sure they are straight and not tapered 1/4" pipe plugs. The manual also cautions about the fittings there on 6T pg272. If it were me I'd put a dab of high temp anti-sieze on them too (like for an O2 sensor) just to assure they run in nice and clean.

[SS Tim]

Originally Posted by barmanvarn

Oh wow!

Had no idea these manuals were available.

thanks! Now I have 500+ pages to review. LOL

Hatzie is the guy to thank, I just provided a link. Seeing as its helping you post a "Thanks!" there on his thread.