My F150 (w/400 c.i.d.) has no catalyst or AIR system. It does have an EGR, Thermac, EVAP, vaccuum advance (distributor) and a couple Ported vacuum switches off the thermostat elbow. When I bought the truck the EGR port on the valve was plugged, as was two of the five vacuum ports on the rear of the engine (off the intake). The other three were still intact: power brake booster, transmission line, and vacuum canister (for heater control valve and interior HVAC control). The port from the passenger side/front of intake manifold (angled) was plugged. Carbon canister was plugged. Carburetor port for vacuum advance was hooked up and functional. PVC port on rear of carb was hooked up and working well. One smaller port on rear of carb and facing firewall was plugged. Thermac system had been disassembled.

In all, it looks like the functional things that the truck needs vacuum for (PVC, power brakes, vacuum canister, vacuum advance) are still working well and hooked up. The emission stuff (EGR, EVAP) that typically quits working after a few years has been blocked off. Seeing that this truck is an early emissions one without a computer, it would seem that it would run MUCH better without that early and often maligned EGR. Sound OK to everyone?

(Please don't comment on the legalities of this - that is not subject to debate!)

thanks again-

 

A well functioning EGR can give you better gas mileage. However with the one you got plugged like that, all the EGR is, is a blocking plate.

And I would consider fixing up the Charcoal Canister, especially if you are having odor problems with fuel around the truck, etc...

Other than what I mentioned, for you to consider, everything else that isn't working anyway, would be fair game.

As for the legality issue you don't want to discuss. I'd just say it would depend on where you live.
Like I live In California, so I'm pretty much stuck, but...
Let's just say if I lived in texas, I would have all the "useless" smog crap on my on truck ripped off of it so darn fast it would make it's head spin.

I'd keep the stuff in a box just incase though

 

Not to worry - I live in North Carolina, in a county where they'd never start emission testing (while I'm alive). You're right about EGR, but I have no pinging. Newer EGR's work so much better with their solenoids, but old ones are crap. The charcoal canister is fine - no fuel smells in the engine compartment or other. In fact, I can't find the EVAP line coming from my fuel tank (unless in older cars it pulls from the carb?).

thx.