displaying posts 1 to 13 of 13

Author Subject: Rich/Lean switching
vernam616

Seasoned Pro

Location: Middlesbrough

Registered: 01 Mar 2008

Posts: 2,822

Status: Offline

Post #1
Me again LOL

From previous threads i have made, i have mentioned the way the car smokes weridly

from cold start up it will smoke (as expected), however upon going for a decent run and then leaving the idle it will blow clear, then after 2 mintures of sitting idle it will start blowing smoke again and it smells very rich

A mechanic friend said this is why its smoking, its unburnt fuel and the ECU/Engine doesnt know whether to run rich/lean, hence it blowing clear then back on to smoky again

What sensor is this? ive just bought a CTS sensor and going to try that later, anything else it could be

bearing in mind in the past few months the car has had a new CAT and a brand new bosch lambda sensor

also to note when the car was on diagnostic it showed the coolant temp sensor working ok with it matching the gauge and upon unplugging it dropped to -40 degrees

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Audi S3 Black Edition
Posted 20th Nov 2010 at 18:07
midlife

Seasoned Pro

Location: Colne, Lancashire

Registered: 13 Mar 2006

Posts: 7,544

Status: Offline

Post #2
Is the lambda sensor actually plugged inDunno

Cool

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Posted 20th Nov 2010 at 18:09
vernam616

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Location: Middlesbrough

Registered: 01 Mar 2008

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Post #3
midlife wrote:
Is the lambda sensor actually plugged inDunno

Cool



Yep , first thing i checked LOL

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Audi S3 Black Edition
Posted 20th Nov 2010 at 18:11
midlife

Seasoned Pro

Location: Colne, Lancashire

Registered: 13 Mar 2006

Posts: 7,544

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Post #4
Must be a faulty lambda thenDunno

Cool

________________________________________

Get used to seeing the yellow one !!!MehMehMehMehMeh
Team 330™Cool
Team "no front end or engine"
Team "LIMITED EDITION" I live for the 306 stickerSmug
Team 0-60 in 6.44 & standing qtr in 14.808 @ 94.55mph all with std engineSmug
203bhp Corolla T-Sport daily driver stealthier than Kwai Chang Caine
Posted 20th Nov 2010 at 18:17
vernam616

Seasoned Pro

Location: Middlesbrough

Registered: 01 Mar 2008

Posts: 2,822

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Post #5
midlife wrote:
Must be a faulty lambda thenDunno

Cool


Would you definatly say it was a lambda sensor?

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Audi S3 Black Edition
Posted 20th Nov 2010 at 18:18
mabgti

NV motors

Location: Bham tunnel @7400rpm

Registered: 28 Aug 2003

Posts: 9,127

Status: Offline

Post #6
If the lambda is permanently faulty.. when car goes closed to open loop it will try the lamda three times at different cycles before it logs fault agen and ignores value.

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Posted 22nd Nov 2010 at 00:19
vernam616

Seasoned Pro

Location: Middlesbrough

Registered: 01 Mar 2008

Posts: 2,822

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Post #7
mabgti wrote:
If the lambda is permanently faulty.. when car goes closed to open loop it will try the lamda three times at different cycles before it logs fault agen and ignores value.


English please mab LOL ?

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Audi S3 Black Edition
Posted 22nd Nov 2010 at 18:07
mabgti

NV motors

Location: Bham tunnel @7400rpm

Registered: 28 Aug 2003

Posts: 9,127

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Post #8
in other words.. change your lambda!

with a lambda fault idle will run between 11 & 12:1 afr... causing the mist on condensation.

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Team Supercharged Gti-6

NV Motorsport
Automotive Performance Tuning
0121 448 7515
ECU Remapping/ DPF removal
VAG/BMW Diag and Option Coding
Peugeot Planet ECU coding/transponder programming etc
www.nvmotorsport.com
Facebook Page
Project S6
Posted 22nd Nov 2010 at 20:39
vernam616

Seasoned Pro

Location: Middlesbrough

Registered: 01 Mar 2008

Posts: 2,822

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Post #9
mabgti wrote:
in other words.. change your lambda!

with a lambda fault idle will run between 11 & 12:1 afr... causing the mist on condensation.


Changed the lambda Mab for a bosch unit

Still no difference and still supping juice like theres no tommorow Sad any other suggestions?

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Audi S3 Black Edition
Posted 11th Dec 2010 at 01:37
rallyeash

Seasoned Pro

Location: Devizes

Registered: 11 Dec 2006

Posts: 4,424

Status: Offline

Post #10
throttle position sensor?

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Posted 11th Dec 2010 at 01:44
vernam616

Seasoned Pro

Location: Middlesbrough

Registered: 01 Mar 2008

Posts: 2,822

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Post #11
rallyeash wrote:
throttle position sensor?


Currently have it disconnected, and this usually increases the fuel consumption

Well it did last time anywayLOL

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Audi S3 Black Edition
Posted 11th Dec 2010 at 02:28
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

Status: Offline

Post #12
plug it back in + ecu re=set.

my engine note changed quite a bit since remembering to plug the lambda back in and re-fitting the cat.

it's using less fuel now Big grin

and sounds evil on WOT Ninja

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Posted 11th Dec 2010 at 02:49
cooper666

Senior User

Location: doncaster

Registered: 27 Nov 2009

Posts: 778

Status: Offline

Post #13
off topic welshpug just read that argument on . net with you and that guy saying s16 doesnt have a map sensor ive just got to Clapping you Laugh my ass off

*edit* just read your for sale thread saying car is/was superchipped this could be your causing the overfueling problems etc

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Posted 11th Dec 2010 at 03:21

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