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Gtir Motorsport club » Tech room » Help and Advice » Not running exhaust lambda sensor

Not running exhaust lambda sensor

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1Not running exhaust lambda sensor Empty Not running exhaust lambda sensor on 1st August 2016, 7:20 pm

Andy Sunny Gti

Andy Sunny Gti
Just realized when I sold my old exhaust the new keeper unplugged and took the o2 sensor plug lead thingy.
So now my new exhaust is on the o2 sensor is missing and nothing attached.
What issues do I run into not having one plugged?
The car still gets up to temp and the fans are still kicking in.
Not running exhaust lambda sensor Image36

2Not running exhaust lambda sensor Empty Re: Not running exhaust lambda sensor on 1st August 2016, 8:39 pm

mreguest

mreguest
@Andy Sunny Gti wrote:Just realized when I sold my old exhaust the new keeper unplugged and took the o2 sensor plug lead thingy.
So now my new exhaust is on the o2 sensor is missing and nothing attached.
What issues do I run into not having one plugged?
The car still gets up to temp and the fans are still kicking in.
Not running exhaust lambda sensor Image36

on my gtir i didn't have the lambda sensor plugged in for about two years before noticing, driven daily all that seemed to be wrong was the MPG was very shocking now it is just regular shocking Smile
think you just run very rich so you get what ever problems associated with that...

the sensor in your picture doesn't look like the gtir one are you thinking for your GTI?

I have this on my GTIR-
http://www.ecolambda.co.uk/main/ecosale/price.pl?item=250-23880

Good luck!
Adam

3Not running exhaust lambda sensor Empty Re: Not running exhaust lambda sensor on 1st August 2016, 8:48 pm

Andy Sunny Gti

Andy Sunny Gti
Yes for a gti, this was just a generic picture. I will check if part numbers are the same for gti/ gtir.
I will possibly just get one on for piece of mind.

4Not running exhaust lambda sensor Empty Re: Not running exhaust lambda sensor on 2nd August 2016, 5:43 am

johnny gtir

johnny gtir
moderator
moderator
A lot don't work on 80% of the pulsars I see and I know mappers map around them. Am I right in saying they only work up to 2000 rpm on our cars and are for tick over emmisions

I could be wrong

5Not running exhaust lambda sensor Empty Re: Not running exhaust lambda sensor on 2nd August 2016, 5:54 am

Mr B

Mr B
gtir technician
gtir technician
Yep, narrow band sensors are closed loop so effect idle no engine load only.

6Not running exhaust lambda sensor Empty Re: Not running exhaust lambda sensor on 2nd August 2016, 6:01 am

Andy Sunny Gti

Andy Sunny Gti
Yes think your right guys, just read this, now I don't have a cat, so I can't really see it being an issue not having one?

What does the Lambda sensor do?

The most popular method used by vehicle manufacturers to reduce engine emissions is the three-way catalyst (catalytic converter). This device has the ability to take the three main toxic gases produced by an engine which are carbon monoxide (CO), oxides of nitrogen (NOx) and hydrocarbons (HC) and convert them to considerably less harmful, non-poisonous gases: carbon dioxide (CO2), water (H2O) and nitrogen (N2).

To carry out this conversion of gases efficiently the catalyst must operate within a specified temperature range but also be provided with exhaust gases that are within certain very tight tolerances dependant predominantly on air/fuel ratio. The precise control required to operate this system is provided by the use of an exhaust gas oxygen (Lambda) sensor installed upstream of the catalyst. A Lambda sensor has the ability to precisely measure the air/fuel ratio present in exhaust gases. By sending a signal to the control unit it can initiate a change to keep the fuelling system operating within the very tight tolerances required. This is known as a closed-loop control system.

To further improve control of exhaust emissions most vehicles produced after 2000 have an additional Lambda sensor fitted down-stream of the catalyst that monitors the performance of the catalyst itself.

7Not running exhaust lambda sensor Empty Re: Not running exhaust lambda sensor on 2nd August 2016, 11:40 am

GTI-R US

GTI-R US
Management
Management
if your not running a cat Andy then none of the above will apply to you.

The narrowband lambda sensor works open and closed loop
so in a nutshell monitors the fuelling at idle & fast idle (upto around 1800rpm)
After this the ecu uses signals/info from maf and the other relevant sensors such as tps, ecu temp sensor,iac, and so forth to monitor and adjust fuelling (stock ecu).

When tuning a vehicle with an aftermarket ecu or piggyback most tuners dis-connect the narrowband lambda and tune the fuelling & ignition maps without it as it can interfere with the map they are trying to input to ecu, the tuner will take readings from maf and other sensors from idle all the way through the rpm and load ranges to wot.
Fuelling is monitored by means of a wideband sensor (so no need for narrowband)
knock levels are monitored by means of det cans or other means of knock control device.

So in short just blank off the narrowband as your tuner wont use readings from it to map the car.
If in doubt give him a call and im sure he will confirm that


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8Not running exhaust lambda sensor Empty Re: Not running exhaust lambda sensor on 3rd August 2016, 12:12 pm

Andy Sunny Gti

Andy Sunny Gti
Okay, thanks for the input guys.
Will be heading back to the tuner next week.
The car runs off a map sensor, using the hks fcon pro ecu, so I am sure they can or already mapped around it before. But won't find out till next week.

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