O2 sensors tuned off
Thread Starter
Staging Lane
iTrader: (3)
Joined: Dec 2010
Posts: 99
Likes: 0
From: Collinsville ,Illinois
O2 sensors tuned off I was wondering if a turner turns off the 02 sensors is that bad? And if why and will a car pick up more or lose horse power ? Just curious because my car they are turned off but the car runs awesome..
You wont have any fuel adjustments on the fly, it is not necessarily bad but on a dd, I would encourage to re-enable them.
Depends on why he did it and how good his tune is... if your exhaust leaks like crazy, then it would be better to run it in open loop with a good tune - because the exhaust leaks would make the feedback from the O2s look like it is running lean and cause unneeded fuel to be added... The down side is you may be loosing some fuel efficiency if his tune is not good.
O2 sensor feedback doesn't effect wide open throttle unless the car is lean (or false lean due to exhaust leaks) and in that case, the posative fuel trims would add onto the WOT fueling - this can cause the car to be overly rich under WOT and that can cause the car to be a dog and down on power...
O2 sensor feedback doesn't effect wide open throttle unless the car is lean (or false lean due to exhaust leaks) and in that case, the posative fuel trims would add onto the WOT fueling - this can cause the car to be overly rich under WOT and that can cause the car to be a dog and down on power...
Thread Starter
Staging Lane
iTrader: (3)
Joined: Dec 2010
Posts: 99
Likes: 0
From: Collinsville ,Illinois
The installer said that the 02 where giving him a fit so I guess that's the reason he turned them off... I notice when we where tuning it the other day he turn them on and the car started bucking and then cut off.... So I doesn't get good gas mileage but it runs good and with the wide band on it it runs around 13-14+ at cruising and light acceleration. Under wot it's good around 12.5 or so!!! It has a small surge at idle now which isn't bad but I will get him to maybe work that out later.i just want to make sure that they won't hurt the motor not being on... Thanks for your advise !!!!!!
Last edited by bigboy2; Dec 4, 2011 at 06:35 PM.
Trending Topics
On The Tree
Joined: Apr 2011
Posts: 181
Likes: 1
Have him provide you with a copy of the tune to post here for review...Though there are reasons a tuner could leave the car in "open loop" (02's not active), it is rare. I'll review the tune and tell you if he if he's even on the right track or as I suspect not doing anything right and full 'O ****.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Staging Lane
iTrader: (3)
Joined: Dec 2010
Posts: 99
Likes: 0
From: Collinsville ,Illinois
I can ask him but I know it's going to be tough because he doesn't return calls or texts unless my engine installer gets a hold of him and he lives around the corner form me!!!! I give it a shot..
Thread Starter
Staging Lane
iTrader: (3)
Joined: Dec 2010
Posts: 99
Likes: 0
From: Collinsville ,Illinois
Just had my car on the dyno this past week and made good power but now the car surges and doesnt want to idle. I tried to stall it up on the converter and it acts like it did when my o2 sensors when out.. somehting just doesnt seem right.... no smoke it also developed a cold start problem where you have to give it gas for about 1 min or so then it would idle on its own.... does this sound like a tuning issue or something else? It is closed loop set up....
