quick question on the EGR valve on my 91z28. I put a new EGR on the new motor i replaced and the EGR valve came with about 10 different size circular "slugs" it looks like. The directions said to match the size up with my old EGR. Well, my old one was for a 305 and now i have a 350. Why did it come with so many of these"slugs" and which one should i have used.they are diffenrt thincknesses too. I think i may have put a wrong one in. The car idles rough and I have this thing about EGR function and how important it is to the car performance. What can i check for to see if the EGR is working right. Are the EGR valves they sell at the local parts sore a peice of ****. Should I have got one form the dealer instead.

 

Where did you buy it at. Every one I have bought at Advance or Autozone was already put together and needed no different "slugs" .

 

BOTTLEDZ,

Those "slugs" are oriface washers, designed to control the exhaust backpressure that the EGR valve pilot will be exposed to. It sounds like you acquired one of the universal EGR valves with the oriface kit that is supposed to fit 90% of the cars on the road. Those are marginally acceptable on a TBI engine (and your speed-density scheme is really the same system) but don't have a good history on TPI and SFI engines.

Given the sensitivity of the EGR system on a TPI engine, I would suggest using the stock valve. If you still plan to use the aftermarket valve, you'll also have to devise a way to install the temperature sensor on the EGR base. This could be no simple task in itself. Without the sensor, you'll get a regular old code '32' in your face on just about any trip.

 

vader, whar do you mean about the temp. sensor on the base of the sensor. I could swear that there was just a plug and a vacuum hose i had to plug into the egr valve. I am going to get an Ac Delco one from the dealer and see if it comes already setup for my motor and not a universal one.