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#3
05-25-2005, 07:53 PM
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I will find out for you off Andy when he comes back. I have heard of it before
 Hopefully he will know 
__________________
Life's not a journey to the grave with the intention of arriving safely in one pretty and well preserved piece, but instead, to skid across the line broadside, thoroughly used up, worn out, leaking oil shouting " GERONIMO " :muhaha: 
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#4
05-25-2005, 07:58 PM
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Not refering to the "grommet" by any chance?
Paul.
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#5
05-25-2005, 08:04 PM
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OK here goes....
I have spoken to pjw and he says that its the Exhaust Gas Recirculation valve On a cold engine it recirculates the gases back into the engine fore more efficient running. hope this helps tina. xx Edited to add this: The EGR valve is the main emissions control component in the exhaust gas recirculation system. The valve is located on the intake manifold, and opens a small passageway between the exhaust and intake manifold to allow a metered amount of exhaust to flow back into the engine. This reduces combustion temperatures and helps control the formation of oxides of nitrogen. The EGR valve is opened by the application of vacuum to its control diaphragm. Some also require a certain amount of exhaust back pressure before they'll open. On newer vehicles, the valve is electronic and uses one or more solenoids or a small stepper motor. The valve should remain closed while the engine is cold and at idle. It should only open once the engine has warmed up and is running at part-throttle. If the valve sticks shut (or is disconnected), NOX emissions will soar and detonation will often result (See Detonation and Spark Knock). If it sticks in the open position or fails to close all the way, it acts like a vacuum leak resulting in a rough idle, hesitation and possible stalling.
__________________
Life's not a journey to the grave with the intention of arriving safely in one pretty and well preserved piece, but instead, to skid across the line broadside, thoroughly used up, worn out, leaking oil shouting " GERONIMO " :muhaha:
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#6
05-25-2005, 08:10 PM
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bonjour...
a wealth of info... from the evo - net service crew... and we dont even have a call out fee...
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#8
05-25-2005, 08:29 PM
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Quote:
I think it has something to do with the intake :???:
__________________
Life's not a journey to the grave with the intention of arriving safely in one pretty and well preserved piece, but instead, to skid across the line broadside, thoroughly used up, worn out, leaking oil shouting " GERONIMO " :muhaha:
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#9
05-25-2005, 08:33 PM
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Found this :
Exhaust Gas Recirculating Valves What are they? What do they do? How do they fail?? 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!!
__________________
Life's not a journey to the grave with the intention of arriving safely in one pretty and well preserved piece, but instead, to skid across the line broadside, thoroughly used up, worn out, leaking oil shouting " GERONIMO " :muhaha:
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#10
05-25-2005, 08:36 PM
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I think it's something else tina, the system i'm thinking of runs either hot air or water (not sure which) over the intake manifold to raise air temps and help on cold days.
You can disconnect it as it's always warming induction air, which is obviously bad for performance.
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In Honda we trust.
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