Where is the EGR value?
09-29-03, 05:04 PM
#1
Lexus Test Driver
Thread Starter
Where is the EGR value?
Hey guys, I don't have a shop manual and I'm no mechanic...
I was wondering where the EGR value is located in my 91? Can someone please circle it in photoshop or something. This may sound like a dumb question but is it possible to clean it? I read that residue can build up inside it. I just replaced my PCV value today, very easy, especially with the help of Lee's thread I found in a search. I couldn't find anything helpful on this topic though. I took this picture of my engine bay this afternoon. I am starting to clean it by the way
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I was wondering where the EGR value is located in my 91? Can someone please circle it in photoshop or something. This may sound like a dumb question but is it possible to clean it? I read that residue can build up inside it. I just replaced my PCV value today, very easy, especially with the help of Lee's thread I found in a search. I couldn't find anything helpful on this topic though. I took this picture of my engine bay this afternoon. I am starting to clean it by the way
.
09-29-03, 07:23 PM
#4
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Originally posted by Jasoneo5
An answer to this question would also really help me out to! What does the EGR valve do? Does it have to do with smog?
An answer to this question would also really help me out to! What does the EGR valve do? Does it have to do with smog?
09-29-03, 07:52 PM
#5
Lexus Test Driver
Thread Starter
some info I found on what it is...
EGR Valve
The Exhaust Gas Recirculation (EGR) valve is used to send some of the exhaust gas back into the cylinders to reduce combustion temperature. Why would we want to do this?
Nitrous oxides (nasty pollutants) form when the combustion temperature gets above 2,500 degrees F. This happens, because at such temperatures, the nitrogen in the air mixes with the oxygen to create nitrous oxides. Did you ever have two friends that were fine by themselves but just awful when they got together? Well, our good friend, the sun, is just like that. When it's sunny, the nitrous oxides from the exhaust get together with the hydrocarbons in the air to form our not-so-good friend, smog. That's when the EGR valve comesin handy.
By recirculating some of the exhaust gas back through the intake manifold to the cylinders, we can lower the combustion temperature. Lowering the combustion temperature lowers the amount of nitrous oxide produced. Consequently, less of it comes out the tail pipe.
There are two types of EGR valves. One operates through the use of a vacuum, and the other operated through the use of pressure. Both types allow the exhaust gas in to lower the combustion temperature when it gets too high.
- http://www.partsamerica.com/Auto101exh.asp#EGRValve
The Exhaust Gas Recirculation (EGR) valve is used to send some of the exhaust gas back into the cylinders to reduce combustion temperature. Why would we want to do this?
Nitrous oxides (nasty pollutants) form when the combustion temperature gets above 2,500 degrees F. This happens, because at such temperatures, the nitrogen in the air mixes with the oxygen to create nitrous oxides. Did you ever have two friends that were fine by themselves but just awful when they got together? Well, our good friend, the sun, is just like that. When it's sunny, the nitrous oxides from the exhaust get together with the hydrocarbons in the air to form our not-so-good friend, smog. That's when the EGR valve comesin handy.
By recirculating some of the exhaust gas back through the intake manifold to the cylinders, we can lower the combustion temperature. Lowering the combustion temperature lowers the amount of nitrous oxide produced. Consequently, less of it comes out the tail pipe.
There are two types of EGR valves. One operates through the use of a vacuum, and the other operated through the use of pressure. Both types allow the exhaust gas in to lower the combustion temperature when it gets too high.
- http://www.partsamerica.com/Auto101exh.asp#EGRValve
Thanks for all your responses so far guys
09-29-03, 09:40 PM
#7
Lead Lap
EGR! Oh Boy!
You will know your EGR valve is bad when you hear an exhaust leak coming from the back of the engine just where the EGR is pointed out to you. If that's ever the case say goodbye to you car for at least a day or two depending on your mechanic. I was out for 3 days, felt stranded and helpless.
The exhaust system(from cat on back) has to be dropped and also the tranny just to get to that one little valve. Didn't believe it but yes its true.....Good Luck.
You will know your EGR valve is bad when you hear an exhaust leak coming from the back of the engine just where the EGR is pointed out to you. If that's ever the case say goodbye to you car for at least a day or two depending on your mechanic. I was out for 3 days, felt stranded and helpless.The exhaust system(from cat on back) has to be dropped and also the tranny just to get to that one little valve. Didn't believe it but yes its true.....Good Luck.
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09-29-03, 09:56 PM
#8
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oz and myself are in the same boat...oz did his car b4 mine(but he REALLY needed to -sounded like a freight truck )but if your getting that replaced, i suggest you also change your starter... (same labor),and
is located in the same vicinity. my starter went bad, and i had my pipe changed as well.. the pipe is in the back of the engine(starter in front of it) and leads to the exhaust- you can see where it bolts in the back.
)but if your getting that replaced, i suggest you also change your starter... (same labor),andis located in the same vicinity. my starter went bad, and i had my pipe changed as well.. the pipe is in the back of the engine(starter in front of it) and leads to the exhaust- you can see where it bolts in the back.
09-29-03, 10:29 PM
#9
Lexus Test Driver
you can get away with EGR pipe labor without dropping the tranny.. the best way is to approach by removing the intake manifold and going from there.. and yes.. its good to change the starter there as well, you'll probably end up having to replace your fuel injector and all the other seals in the process but its worth it..
bettter than me, I paid labor for starter, then egr pipe went bad, probably because of the starter job
bettter than me, I paid labor for starter, then egr pipe went bad, probably because of the starter job
09-30-03, 01:50 PM
#13
Lexus Test Driver
blocking the egr pipe wouldnt let your car run... the pipe comes from the intake manifold to the exhaust manifolds which leads to the cat converters, so I dont see wheres teh performance gain..
if you are talking about the egr module/valve or whatever it is, i dont know bout that
if you are talking about the egr module/valve or whatever it is, i dont know bout that
09-30-03, 07:12 PM
#15
Lexus Test Driver
Thread Starter
Great discussion here, I'm learning a lot 
. I looked around in the back of the engine and found the aluminum EGR pipe....$600 to replace that, ouch!
I'm definitely not going to mess with this one, especially since it's not broken
.
. I looked around in the back of the engine and found the aluminum EGR pipe....$600 to replace that, ouch!I'm definitely not going to mess with this one, especially since it's not broken
.