I have a question on a '77 Olds 403 EGR vacuum circuit. How is the vacuum circuit routed to the thermal switch? I know that the thermal switch has three ports: one goes to the metered vacuum on the carb an the other goes to the EGR. Where does the third vacuum port on the vacuum switch route to? Thx!
Non-Gbody EGR Question
- Thread starter foxtrot
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Cool - thx! The EGR tvs should only have two ports.
Also interesting to see that the canister vacuum is ported. I thought that port on my carb wasn't working since I did not feel any vacuum at idle. I was thinking that port should work just like the PCV vacuum port but I was wrong.
Thank you.
Also interesting to see that the canister vacuum is ported. I thought that port on my carb wasn't working since I did not feel any vacuum at idle. I was thinking that port should work just like the PCV vacuum port but I was wrong.
Thank you.
don't thank me, thank google.. 
77 Olds 403 EGR vacuum circuit + google = http://www.autozone.com/autozone/repair ... 5280080fb7
77 Olds 403 EGR vacuum circuit + google = http://www.autozone.com/autozone/repair ... 5280080fb7
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