Where is the EGR valve and how do I replace it?

Question

We have a 1994 GMC Jimmy, and we need to replace the EGR valve.

Answer 1

The EGR is the Exhaust Gas Recirculating valve, and basically dilutes the intake charge to reduce oxides of nitrogen (NOX) emissions by reducing the exhaust temperatures. By adding exhaust (and inert gas) this limits the amount of air available to mix with fuel causing a drop in exhaust temperature and the formation of NOX.

The issues with these valves tends to be carbon buildup and sticking between the pintel and seat causing a major vacuum leak and poor idle and stalling at small throttle openings (Idle and off idle operation).

Cleaning may be an option but seldom completely corrects the problem permanently.

The following site gives step by step procedures, along with some diagnosing info ,

http://www.autozone.com/shopping/repairG...

Answer 2

Its the Emission System.

Answer 3

It's on the intake manifold and can be removed and cleaned first then do a top engine clean you have to buy top engine cleaner from GM parts store, most cars build up gum in the egrs and the cleaning is the best thing to start with. it will enhance performance and lower your problems with carbon build up. If the truck is equipped with a digital egr you can remove it and clean the tip with engine degreeser and a tooth brush, all egrs can be done this way but it the EGR sticks and the shaft has nicks you will have to replace it. But it is costing you big on fuel.

Answer 4

An EGR valve is an Exhaust Gas Regulator, commonly found on diesel cars. I would first recommend getting it cleaned rather than replaced because they can be quite expensive. I am not sure there but here in the UK it cost me £120 about $200 US on a diesel car, sometimes it can just fill up with carbon deposits and needs a good clean which can be done very cheaply. It might save you a bit of money :) Hope this helps.

Answer 5

Since you know that it needs to be replaced, the easiest way of finding it is to have the replacement in hand and match it to your vehicle.

   The problem with this approach is in discovering that you aren't, in fact, for lack of proper tools or whatever reason capable of replacing it yourself.

  Most decent auto parts stores will allow you to return a non electrical part, but check first.

   If you want to find it first, picture an assembly that would fit in a 5" square (give or take) box. It will probably have a oval shape as part of the assembly where the diaphragm resides and the rest more or less rectangular. It's going to have a roughly 3/4" steel tube running to it from the exhaust for the purpose of RECIRCULATING it, and in all likelihood two VACUUM lines to control the diaphragm. The main areas of concern when doing it yourself are accessibility  and a large enough wrench (preferably not an adjustable) for the nut on the exhaust tube. Keep in mind that you'll need enough maneuvering room to allow you to clean the engine side mating surface of old gasket material, should any stay behind.

   You'll know it when you see it because it's the only place that will have an exhaust tube entering the intake air, and will be before the intake manifold devides.

   Hope this helps and good luck..

Answer 6

That is the Exhaust Gas Recovery and is a part of the emissions system. It should be on your intake before your manifold and may have coolant lines running to and from it.