EGR?

[Big Blue]

I pulled off the EGR valve today and discovered that the diaphram has a bunch of holes in it and doesnt do anything. I think thats whats happening, at least. My question is what does the EGR do and will it effect performance if it doesn't work?

[BostonWagoneer]

EGR stands for Exhaust Gas Recirculation. It is part of the emissions system. If you remove the EGR or it isn't working properly, it can make your engine run poorly. If you remove it and that is legal in your state, you can put a block-off plate over the hole in the manifold so that the engine won't pull in more air that way.

[Big Blue]

Thanks BostonWrangler.

[kreb]

i think you can benefit from keeping the egr. the system was set up to run that way, if you take it off you need to make sure to do it correctly. the engine temps will rise a bit if you take it off and you will run leaner if you do as well.

benjamin

[carrotman]

When the manufacturers first put EGR on vehicles in the early 70's they ran crappy. Everybody was plugging them. They are not supposed to run at idle, but many carboned up and stayed open all the time. I won't say if they are good or bad, but the tech manual says to test it by manually pushing on the diaphram. If the idle immediately drops by 200 RPM, it's working (meaning it's not working at idle). My 76 EGR doesn't work and it passes Colorado emissions and is as clean as many newer vehicles.

[Cecil14]

I unhooked the vacuum line to the EGR valve on my '90 S-10 because I thought that was a problem I had at one point. My gas milage dropped by about 4mpg. Just something to think about. I'm sure you can get a working valve from someone here or a junkyard for not a whole lot.

Anthony

[Nobby]

Just a quick point, the EGR is back pressure sensing, so that if you try to bench test by placing a vacumm on it it, nothing will happen you might even hear air leakage leading you to believe that the diaphagm is shot.

There is a little valve on the end of the pintle fed by a hole drilled in the pintle, which when a a certain exhaust pressure is applied to will close the valve making the diaphragm operate under vacuum.

I have successfully tested mine by placing the pintle end in my mouth and blowing fairly hard whilst placing a vacuum on the diaphragm.

[ds]

could you guy's read this post
maybe stuck egr issue??
and tell me if this sounds like a sticking egr valve
thanks