RHR281m

i was wondering if anyone here had deleted there egr valve and seen any problems and or performance/ mileage increases.

thanks

Sxynerd

I deleted mine...

amrcnidyot

i deleted mine a while back, mines a v6, i didnt notice any difference at all really. i did it because i thought it looked ugly and im trying to clean up the engine bay a little bit.

dh04 red gt

what would be the reasoning for the removal of the egr. and what exactly does it do

BraMas

Here is a pretty easy explanation.
EGR Valves have been around for a long time. Way back in 1972 GM used them in an attempt to reduce emissions of oxides of nitrogen (NOx) which were a major cause of air pollution, mainly photochemical smog, that kind of smog which is formed when strong sunlight shines down on the exhaust gasses we puke out of our tailpipes by the billions of cubic feet a day. A short chemistry lesson is in order here. It was discovered way back when, that high combustion chamber peak temperatures (the really short duration high temperatures near the end of the combustion process) caused oxygen and nitrogen to combine chemically and form these oxides of nitrogen mentioned above. Most of the anti-pollution devices of the day did a pretty good job of reducing the other bad by-products of combustion, namely excessive hydrocarbons and carbon monoxide, however they tended to induce the formation of oxides of nitrogen. Something had to be done else we would all die of smog diseases. The automotive engineers figured that they needed to do something to lower the peak combustion temperatures which only occurred under certain high load driving conditions. They figured they could do so at the expense of power and fuel economy but what the heck, ya can't have everything! If they could only add something to the combustion chamber that would act like sort of a fire extinguisher to cool the combustion temperatures that would do it. So they invented a way to allow some very inert gas to get back into the combustion chamber only when needed. They needed a source of this gas - it wasn't air, cuz that contains oxygen and nitrogen which caused the problem in the first place. So they chose carbon dioxide. Where to get a supply of carbon dioxide . . . ??? Hmmmm, how about the exhaust system? That is mainly carbon dioxide and water (plus a zillion other noxious chemicals) Suppose we allow some of the exhaust gas to get back into the intake manifold under strict control and only when we need it? That would cool the combustion chamber and prevent the formation of the NoX. Maybe we should call it recirculated exhaust gas (REG??). But a guy named Reginald voted no cuz he didn't want his name associated with a car part, so they called it exhaust gas recirculation (EGR) since there was nobody around with that name. Now we understand why it is there. And we understand what it does. So what can go wrong with it and what are the symptoms?? It's really pretty simple - it can be open when it isn't supposed to be, or it can be closed when it is supposed to be open. Not rocket science, but it is science. If it is open when it is not supposed to be open, at idle for instance, It will act like one monster vacuum leak and the engine will not idle or will idle really roughly. If it doesn't open when it is supposed to open you will probably experience a symptom of "pinging" or "knocking" since the combustion chamber temperature will be higher than normal (one of the main causes of pinging in an engine). There are a zillion different types of EGR valves some of which work strictly on vacuum, and some which work on a combination of vacuum and pressure. Some have electronic controls, some have mechanical controls. I won't go into detail here about all the different types but suffice it to say that most can be checked by looking inside to see if the plunger shaft is stuck open or doesn't move when the engine is revved up (after it is warmed up). Replacement is probably the easiest part since most are held in by two small bolts and have a vacuum line connected to it. The hard part is whipping out your Visa card to pay for it since most of them will drain your reserves in a hurry!!http://www.misterfixit.com/egrvalve.htm

amoosenamedhank

It's kind of a pointless thing to do unless you have a reason. I deleted mine but I was building a set of headers. I won't have done it, just to do it.

Sxynerd

I deleted mine just because it looked like poop and you don't gain anything from it. The EGR cooling combustion temps is nominal and it don't look very good under teh hood, so it's gone. Besides even if it does help with MPG, I'll worry about MPG in my honda not in my mustang. I'm still getting in the 25-26 range of MPG being Supercharged, i'm less obviously when i'm in boost. My average peak with being N/A was 28.6 on the freeway.

pcs

if your state has emissions test or inspections though they might get you on not having one though. i just used my tuner to delete it and made a block off plate using the gasket. it removes some clutter and weight off the car.

amoosenamedhank

Well it does look like poop but like I was kinda say. Sxynerd was cleaning up his engine bay, I was switching headers both of them have a reason. I wouldn't just be sitting around on a Saturday thinking "hmmmm what should I do today, I know I'm going to delete my EGR system". It would be a pretty big waste of time unless you actually have a purpose for doing it.

RHR281m

well im not overly concerned about mpg but i use my 98gt fir a daily so i dont miss out on all of the fun when the bullitt is sitting in the garage.

after my oem plenum cracked i started to clean up the engine bay while i was waiting for parts and i figured this would be a good visual mod to go with a freshly polished upper plenum. also all my supra buddy's do the whole egr blockoff plates to be JDM...lol i suppose it would be more benifitial to a i6 with a big hair dryer on it