how to adjust CO2 on a EA82T?

Hyfly · Post by **Hyfly** » Tue Aug 29, 2006 6:57 am

hello everyone,

i have a problem with my 1.8t, the CO2 value is 3 times higher then normal.
so i wil not get the approvement on my car witch is needed in the netherlands.

there's no lambasonde on my engine.

thanks,

stefan

fredsub · Post by **fredsub** » Tue Aug 29, 2006 8:35 am

CO2 ? well then you got very good combustion indeed, no problem....

but maybe you mean CO (carbon monoxide) ? hmmm running too lean?
or NO2 - that would also mean too lean.
is EGR functioning?

What ECU is it?
and this 3x CO ? is that at idle,load,what rpms?
I would guess if all sensors and fuel pressure/injectors and idle mix is correct,
then the fuel map should be rather correct - the O2 (lamba) sensor can fine tune it some more....but 3x ?

Hyfly · Post by **Hyfly** » Fri Sep 01, 2006 2:08 am

you are right, i mean CO.
three times more than normal is almost is every rpm.

witch sensor is controling the air/feul mixture?

Craigus · Post by **Craigus** » Fri Sep 01, 2006 7:01 am

witch sensor is controling the air/feul mixture?

That would be the lambda or oxygen sensor, which you said you did not have ...

Hyfly · Post by **Hyfly** » Fri Sep 01, 2006 7:19 am

what do you mean with an oxygen sensor? airflow meter?

and a lambdasonde is not included on this series... to bad

steptoe · Post by **steptoe** » Fri Sep 01, 2006 10:09 am

it is the oxygen sensor that is normally screwed in exhaust before or after the turbo. only seen one wire oxygen sensors on EA82T. The signal from this varies the mixture. There may be something at this website http://www.bosch.com.au do you have a http://www.bosch.com.nl or http://www.bosch.com.de ?

steptoe · Post by **steptoe** » Fri Sep 01, 2006 10:14 am

a leaflet I have on bosch O2 sensors states a worn out O2 sensor is the number one cause of excessive harmful exhaust emmissions and can cause engine performance problems such as surging and hesitating. or the connection between sensor and computer

subanator · Post by **subanator** » Fri Sep 01, 2006 10:34 pm

Some JDM engines had 2x sensors, one after the CAT and the normal one before the turbo.

Hifly, have you a hotwire type airflow meter? Give this a clean with electronic cleaning fluid, as this is known to give bad values to the ECU and run rich.

Hyfly · Post by **Hyfly** » Sat Sep 02, 2006 2:36 am

subanator, i have a hotwire type airflow meter, thanks for the tip!
and i can't find any 1 wired oxygen-sensors in my exhaust pipe before or behind the turbo.

and there's also no wire from my ECU that has to go to my oxygen sensor.
I think the factory didn't equipped it with an oxygen sensor already....to bad...

thank for the awnsers!

steptoe · Post by **steptoe** » Sat Sep 02, 2006 7:28 pm

can an efi set up operate without an oxygen sensor to correct the mixtures. I understand that if it not there or working, the ecu maps choose rich path to protect from lean out damage.

Gannon · Post by **Gannon** » Sun Sep 03, 2006 6:53 pm

Hyfly,.. are you the guy from Holland with the EA82T Volkswagen Bettle

Do you still have the stock dump pipe?

I doubt any efi car will run well without an o2 sensor and i also doubt that the ea82t would not have a o2 sensor.

I also second cleaning the MAF with some cleaner.

Gannon

subanator · Post by **subanator** » Mon Sep 04, 2006 12:25 am

jono wrote:can an efi set up operate without an oxygen sensor to correct the mixtures. I understand that if it not there or working, the ecu maps choose rich path to protect from lean out damage.

Jono in quite right in this comment, the O@ sensor is narrow band measurement, and really only does a small correction at cruising to acheive 14:1 air to fuel ratio. Under boost the signal is ignored anyway.

Hifly, to answer your question about the single wire O2 wiring, it is not found in the engine wiring harness, but in a Subaru body wiring that goes to the gearbox, a connector before the gearbox is usually at the firewall.
The pinout from the ECU plugs should have this wire in the appropiate plug + sheild if you are to wire one in.

Hyfly · Post by **Hyfly** » Mon Sep 04, 2006 3:48 am

Suparoo wrote:Hyfly,.. are you the guy from Holland with the EA82T Volkswagen Bettle

Do you still have the stock dump pipe?

Gannon

hey Suparoo, i'm the guy from holland with the VW bug, I do not have the stock dump pipe anymore, i used the ..... (the thing that connects with the turbo) to make my "custom" exhaust.

if I read everthing right, then my ecu is equipped with CO measurement from the factory, so I could plug in a lambdasonde if I want to (one wire).

I have no idea if there is a sort of aftermarket ecu for these engines, maybe for plugging my laptop in

thanks for everything!

Stefan.

subanator · Post by **subanator** » Tue Sep 05, 2006 12:35 am

Hyfly, to correct a couple of yours and my own comments:
The EA82T MPFI has an oxygen sensor (O2), not Carbon monoxide sensor (CO). It is to monitor the unburnt oxygen from combustion to measure the air/fuel ratio.

I now have seen in the OEM manual that the O2 sensor was only fitted to Australian and Californian models, and have seen then in Japanese market engines. You could be quite right to say there is not one fitted to yours, as it may have not been a requirement in your country.

If you want to check it out further, the pin out for the 3 Plug ECU is 4 + shield to ground. For the 4 Plug ECU its pin 48 + shield to ground.
- Roger

subanator · Post by **subanator** » Sun Sep 10, 2006 10:27 pm

Hifly, seen this on USMB, it wa listed under CO2 emission controls, might be of some interest. It refers to the EGR valve.
http://www.usmb.net/repair/?CurrentDire ... 773347.art

YouTube · Post by **El_Freddo** » Mon Sep 11, 2006 5:59 pm

In the Haynes manual it explains that during engine warm up the O2 sensor doesn't work cos it needs to be at a certain tempreture to operate, when this happens, the ECU runs in "open loop" - leaning off the fuel mixture until the O2 sensor is operational. This helps in warming the engine up quicker. If the O2 sensor wire has been cut at the wire harness (mine was) and your not running one you could experience some over heating and pinging...

If as suggested your car doesn't run one of these (as from factory) then it may be as subanator said with the ERG valve. If this is not operating properly, then you could also be experiencing some overheating and a change in the emmissions (only tests will tell you this though).

Good luck with it, hope you get it passed.

Cheers