EGR connections to Holley carb, how to??

[88GW]

I have a Holley Truck Avenger on my 88 GW. I've been running without the EGR and all seems fine. But I have been wondering the correct way to run the vacuum lines from the carb to the CTO and back to the EGR. My undertsanding is ported source off of carb to top of CTO with five ports(yellow CTO), the port down below the one you hooked with ported source from carb goes back to EGR. I am not running the stock air filter housing so I eliminated the temperature dohicky. Does this sound right?

[derf]

I set up mine to run off manifold vacuum from behind the carb.

[Ralph]

The EGR routing is independent of the carb on your engine. Some aftermarket carbs have an EGR port, but this is generally intended for a small block Chevy or Ford application.

Follow Derf's advice. (Man, that doesn't even sound right!)

[88GW]

The reason I thought it should come off of the CARB then to the CTO then to the EGR valve was, it says thats how it should be done in my HAYNES manual. Thought I might try to do it the way they tell you to.

If everyone thinks it should be run off of straight manifold vacuum than thats what I'll do.

[Bob Barry]

DON'T run it off straight manifold vacuum. It will be opening at idle, which will cause your truck to run like garbage, if it even idles at all. If it idles well with the EGR hooked to manifold vacuum, your EGR valve is not working or the passages are clogged.

You can run it off regular ported vacuum, but it's best to run that line through the air-temp switch in the air-cleaner housing and through a 110ºF (or so) CTO switch, to keep it from kicking in until the engine is warmed up. Driveability is worse when the EGR kicks in on a cold engine.

[88GW]

Thanks Bob. I thought r8unning off of maifold vacuum would either open or close the EGR incorrectly.

I will use ported only. But I may use Ported to the CTO and then back to the EGR.