smithy1984
Guest
i was told the egr valve as it come up on diagnosis then when they took egr valve of and stripped it said it was blanked of and that the turbo was gone aswell im not sue what to think
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Point of EGR
- Thread starter bluetoledo
- Start date
LOL your egr only came up on diagnosis cause it was blocked. Turbo dieing is most likely due to poor servicing and lack of checking your oil level regularly.
smithy1984
Guest
thats true but my car has been very well looked after serviced oil checked etc so its not that some one else has said its because its chipped turbo been workin over time think im goin try a seat place and get it looked by some one who nos bout the cars and what there doin lol
well we've had most of the answers, what's the question (problem)?
p.s sorry to hijack the original thread
smithy1984
Guest
its cool dont worry about it. i have never heard of an EGR making a turbo die? very very very very very unusual. especially on a vag engine.
cheshire cat wrote
not at high load---------
I could be wrong, but EGR is used to reduce peak combustion temperature. Peak combustion temperature happens at high load, as far as I know.
The ECU turns off EGR at full throttle so as to get a more impressive peak power figure to put in the spec sheet.
not used at all on trucks as far as I am aware, X litresX a gazillion trucks, as our colonial freinds say go figure
This can only be the case if trucks are subject to different environtmental legislation than cars. Which is always possible.
not at high load---------
I could be wrong, but EGR is used to reduce peak combustion temperature. Peak combustion temperature happens at high load, as far as I know.
The ECU turns off EGR at full throttle so as to get a more impressive peak power figure to put in the spec sheet.
not used at all on trucks as far as I am aware, X litresX a gazillion trucks, as our colonial freinds say go figure
This can only be the case if trucks are subject to different environtmental legislation than cars. Which is always possible.
Hi guys, i did this a few weeks ago and have had flashing glow plug light come on 3 times since, it always goes out by itself but the error code it logs says the EGR valve has a short/open
Does this mean that the EGR is constantly open and recirculating all the time
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hmm. I had no problems, but it just means the valve is always open (i think) so its not reciculating **** from the exhaust.
If you keep getting the warning light, get hold of a copy of VAG-COM, or find someone who has it, and then turn the EGR valve right down, you cant turn it off, irrc, but you can turn it down so low that its pretty much useless
Hope that helps
If you keep getting the warning light, get hold of a copy of VAG-COM, or find someone who has it, and then turn the EGR valve right down, you cant turn it off, irrc, but you can turn it down so low that its pretty much useless
Hope that helps
cocadave wrote
Hi guys, i did this a few weeks ago (unplug the N18) and have had flashing glow plug light come on 3 times since, it always goes out by itself but the error code it logs says the EGR valve has a short/open
I'm guessing that you mean you unplugged the electrical connector from the N18 valve (which is what I have also done). Mine shows no warning lights. Later versions than mine of the ECU software apparantly check that the valve is connected. The way around this would be to put a resistor across the solenoid connections of the disconnected plug.
Does this mean that the EGR is constantly open and recirculating all the time
No, the report is shorthand for "EGR valve is short-circuited or open-circuited", referring to the electrical connection. The EGR valve itself defaults to the shut position, so with N18 disconnected it will stay shut.
Hi guys, i did this a few weeks ago (unplug the N18) and have had flashing glow plug light come on 3 times since, it always goes out by itself but the error code it logs says the EGR valve has a short/open
I'm guessing that you mean you unplugged the electrical connector from the N18 valve (which is what I have also done). Mine shows no warning lights. Later versions than mine of the ECU software apparantly check that the valve is connected. The way around this would be to put a resistor across the solenoid connections of the disconnected plug.
Does this mean that the EGR is constantly open and recirculating all the time
No, the report is shorthand for "EGR valve is short-circuited or open-circuited", referring to the electrical connection. The EGR valve itself defaults to the shut position, so with N18 disconnected it will stay shut.
cocadave wrote
Hi guys, i did this a few weeks ago (unplug the N18) and have had flashing glow plug light come on 3 times since, it always goes out by itself but the error code it logs says the EGR valve has a short/open
I'm guessing that you mean you unplugged the electrical connector from the N18 valve (which is what I have also done). Mine shows no warning lights. Later versions than mine of the ECU software apparantly check that the valve is connected. The way around this would be to put a resistor across the solenoid connections of the disconnected plug.
Does this mean that the EGR is constantly open and recirculating all the time
No, the report is shorthand for "EGR valve is short-circuited or open-circuited", referring to the electrical connection. The EGR valve itself defaults to the shut position, so with N18 disconnected it will stay shut.
what he said
stuartsjg wrote
Ive had vagcom on looking at the temps, 4k revs at full throttle there is over 1200C exhaust temp - plent of NOx's being made there im sure!
I've been trying for some time to find a polite way to phrase this. I've had to give up.
It is high COMBUSTION TEMPERATURES that produce NOx. We are talking about burning Nitrogen here, one of the least reactive of gases. It is transient peaks in cylinder temperatures that generate the NOx, oxidising the nitrogen in the inlet charge.
I know smog isnt a huge prob in the UK but anything to help folk that have breathing problems and im happy with it. Knowing plenty of asthmatics (Fiancee included) im sure they are thankful for our few HP loss in return for improved air quality!
Sympathies for your fiancee - athsma can be very debilitating.
The mechanisms by which NOx affects smog and ozone concentrations are arguable. However, the byproduct of EGR is exhaust smoke, particulates, which are a known issue with breathing difficulties. EGR reduces NOx by reducing oxygen content in the cylinder, which means incomplete combustion.
EGR is the main reason why modern diesels emit any smoke at all.
The EGR recirculation is cooled via a heat exchanger by a med temp water take off from the cylinder block. This water then goes to the heater matrix for the cabin heat then to the main radiator.
Blocking the EGR may mean the heater performance is reduced as the water temp will be about half way between the flow to and from the radiator as it wont get an extra topup from the EGR.
miniscule effect, diesels warm up slowly anyway (more efficient combustion, less waste heat). Contribution from EGR cooling is lost in the noise.
Anyway, if you want a few extra HP, put the AC off and your lights, heated seats etc and empty the boot.
What, drive uncomfortably, in the dark, with no load? You're a rally navigator, aren't you (so was I, years ago)
Air cooling is more economical than keeping the windows down at open-road speeds. In town, crawling, aircon is more expensive, but at this point you aren't looking for engine power,.
Ive had vagcom on looking at the temps, 4k revs at full throttle there is over 1200C exhaust temp - plent of NOx's being made there im sure!
I've been trying for some time to find a polite way to phrase this. I've had to give up.
It is high COMBUSTION TEMPERATURES that produce NOx. We are talking about burning Nitrogen here, one of the least reactive of gases. It is transient peaks in cylinder temperatures that generate the NOx, oxidising the nitrogen in the inlet charge.
I know smog isnt a huge prob in the UK but anything to help folk that have breathing problems and im happy with it. Knowing plenty of asthmatics (Fiancee included) im sure they are thankful for our few HP loss in return for improved air quality!
Sympathies for your fiancee - athsma can be very debilitating.
The mechanisms by which NOx affects smog and ozone concentrations are arguable. However, the byproduct of EGR is exhaust smoke, particulates, which are a known issue with breathing difficulties. EGR reduces NOx by reducing oxygen content in the cylinder, which means incomplete combustion.
EGR is the main reason why modern diesels emit any smoke at all.
The EGR recirculation is cooled via a heat exchanger by a med temp water take off from the cylinder block. This water then goes to the heater matrix for the cabin heat then to the main radiator.
Blocking the EGR may mean the heater performance is reduced as the water temp will be about half way between the flow to and from the radiator as it wont get an extra topup from the EGR.
miniscule effect, diesels warm up slowly anyway (more efficient combustion, less waste heat). Contribution from EGR cooling is lost in the noise.
Anyway, if you want a few extra HP, put the AC off and your lights, heated seats etc and empty the boot.
What, drive uncomfortably, in the dark, with no load? You're a rally navigator, aren't you (so was I, years ago)
Air cooling is more economical than keeping the windows down at open-road speeds. In town, crawling, aircon is more expensive, but at this point you aren't looking for engine power,.
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