Performance and Tuning Discussion forum for various performance tuning techniques and questions

Car stuck in open loop.

Thread Tools
 
Search this Thread
 
Old Apr 12, 2008 | 06:35 AM
  #1  
alpinab7's Avatar
Thread Starter
AudiWorld Super User
 
Joined: Dec 2001
Posts: 2,450
Likes: 0
Default Car stuck in open loop.

My car (1995 S6 AAN motor) has custom software, injectors, turbo, etc. from the previous owner. I am having a hard time getting it to pass emissions. It seems that it is stuck in open loop. VAGCOM says the lambda control is stuck at 1.00 when it should fluctuate. I am not sure if it is a problem with something like the MAF sensor or if it is software. (car warms up fine and the ECU is reading the coolant temp just fine.) Often cars are tuned in open loop so the ECU doesn't change the mixture during tuning. How is closed loop disabled and could it be disabled in my car? Is it just by disconnecting the O2 or is it done in software? I am unable to find any info about my software from the previous owner.
Reply
Old Apr 22, 2008 | 04:08 PM
  #2  
ianbis's Avatar
AudiWorld Senior Member
 
Joined: Jul 2001
Posts: 1,274
Likes: 0
Default

have someone vag the car and check the O2 sensor activity
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
alpinab7
Audi Original "S" Cars
6
Apr 10, 2008 10:38 PM
alpinab7
Audi Original "S" Cars
4
Nov 7, 2006 12:30 PM
13377
TT (Mk1) Discussion
6
Nov 5, 2004 12:33 PM
Ofeelya
Audi 5000 / 200 / V8 Discussion
10
Jul 30, 2003 07:03 PM
LarryF_in_Ca
Audi 5000 / 200 / V8 Discussion
1
Jan 24, 2003 09:12 AM




All times are GMT -8. The time now is 04:11 PM.

story-0
The Highs & Lows of Every Audi C-Class Generation

Slideshow: The highs and lows of every Audi C-Class generation.

By Joe Kucinski | 2026-05-27 16:05:50


VIEW MORE
story-1
Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer

People were more than happy to shell out big bucks for these cars.

By Brett Foote | 2026-05-27 15:32:23


VIEW MORE
story-2
10 Audi Features & Options We Miss the Most!

Slideshow: 10 Audi features and options we miss the most.

By Joe Kucinski | 2026-05-12 19:33:47


VIEW MORE
story-3
Audi Recreates Crazy-Looking Speed Record Breaker From 1935

Slideshow: Audi has recreated one of the wildest machines of the pre-war speed-record era, reviving a streamlined V16 racer that originally exceeded 200 mph in 1935.

By Verdad Gallardo | 2026-05-11 09:49:34


VIEW MORE
story-4
Coachbuilder Recreates the 1995 Audi TTS Concept

Slideshow: A Dutch coachbuilder has reimagined the original Audi TT by finishing what the 1995 concept only hinted at.

By Verdad Gallardo | 2026-05-05 15:17:58


VIEW MORE
story-5
Every Audi V10 Car Ranked!

Slideshow: Ranking every Audi V10 road car

By Joe Kucinski | 2026-04-29 16:11:56


VIEW MORE
story-6
9 Audi Designs That Aged Like Fine Wine

Slideshow: A look back at the Audis that didn't just survive changing tastes, they quietly outgrew them.

By Verdad Gallardo | 2026-04-28 19:38:27


VIEW MORE
story-7
2026 Audi Q5 Buyer's Guide (Every Model Explained)

One year off a full redesign, the best-selling Q5 is getting a few more updates.

By Brett Foote | 2026-04-17 09:56:19


VIEW MORE
story-8
Ranking Every Current Audi 'S' Model From Worst to First!

Slideshow: Ranking every current Audi 'S' model on sale today from worst to best.

By Joe Kucinski | 2026-04-16 10:28:28


VIEW MORE
story-9
10 Best Audis That are FINALLY LEGAL to Import to the U.S.!

Slideshow: 10 best Audis that are finally legal to import to the U.S.

By Joe Kucinski | 2026-03-24 17:20:08


VIEW MORE