So my egr is not working on my wife's 94 LT1 firebird. If it run a vacuum line straight to the egr and suck on it with the car off it will draw the erg fully open and stay there if i put my finger over the end of the vacuum line. But when i start the car it immediately goes back to closed. .
I also tried hooking the vaccum line straight from the egr diaphragm to manifold vaccum but no change in the engine. However if i push the diaphragm open by hand it will bog the car down.
Unfortunately the egr cost 70 dollars and has to be gotten from a v8 camaro or firebird. neither of which are in the local junkyard so be for I spend the 70 dollars I was looking for a little more input. It seems so odd that the valve will stay open when the engine is off but not with it running.