VAG-COM question - EGR Shutoff

[sonic_vi]

Ok got a VAG diag cable ordered.

What i need to know is does anyone know the adaptation code for stopping the EGR valve feeding hot exhaust gases back into the engine.


Cheers

 

[cheshire cat]

don't bother just block off the vac pipe and replace, assuming you're not running somthing super new, ie:2ltr/16 valve

 

[sssstew]

its detailed here :-

http://tdiclub.com/TDIFAQ/TDiFAQ-7.html#j

 

[sonic_vi]

its detailed here :-

http://tdiclub.com/TDIFAQ/TDiFAQ-7.html#j

sorry should have said, its a leon cupra 20v T

 

[Uwe@Ross-Tech]

What engine code?
What makes you think it even has EGR?

-Uwe-

 

[sonic_vi]

Guy at work with an octavia VRS has shut his off...apparently.

 

[Uwe@Ross-Tech]

Look, a "20v T" is a 1.8T motor, but do you have any idea how many different configurations of 1.8T motors there are? In order to have any possibility of giving you useful info, I need your engine code.

-Uwe-

 

[amgtorre]

I have not seen EGR on any 1.8t engine.

The 1.8T engines have secondary air injection

 

[sonic_vi]

ok no worries

i guess it aint got one then

i'll inform him he is speaking from his rectun

cheers guys

 

[Uwe@Ross-Tech]

I have not seen EGR on any 1.8t engine.

The 1.8T engines have secondary air injection

You understand that these systems have totally different purposes?

EGR is used reduce NOx emissions at low loads which come about with high combustion chamber temperatures, especially when an excess of oxygen is present.

Secondary air injection is used to help light off the catalytic converter more quickly after a cold start.

The fact that an engine has one of these does not preclude it from having the other as well.

-Uwe-

 

[Muttley]

sonic, you need to supply the engine ident code so that Uwe can advise you. It will be stamped on the engine, next to the gearbox join, and also on a label on the cambelt cover; also it is on the build sheet in the boot, under the carpet, which might look something like this -

VSS ZZZ 1M Z 1R012345 - - - Chassis number 1R012345
1M15 36 - - - - - 1M1=Leon
LEON 1.8 T SPORT
132 ABC D6E - - - - - 132 KW = engine power
AUQ FZQ - - - - - Engine code AUQ and Transmission code FZQ

That having been said, I can't find a 1.8T in a Leon I that has EGR. Doesn't mean that there isn't one, though, just that I can't find it.

Uwe, maybe you can give an opinion here, as I am confused by the use of EGR on a petrol engine. Diesels have no means of reducing oxygen in the combustion charge other than inert gas injection, but petrol engines have a throttle. Is it really just to reduce pumping losses while achieving an approximation to lean burn? That could explain why it seems to be confined mainly to lower-powered engines.

 

[Uwe@Ross-Tech]

No, I don't think EGR on a petrol engine has anything to do with reducing pumping losses. It's purpose is to reduce NOx emissions. It does this by reducing the temperature of the gas charge in the cylinder during and immediately after combustion. In a petrol motor it does not affect the mixture much if at all. The effect comes from having a larger portion of the gas mixture in the cylinder being inert.

-Uwe-