Thinking outside the box
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 951
Likes: 0
From: La Plata MD
Thinking outside the box
I have a buddy who has a 2003 Cobra that he has completely customized with a upgraded forged motor and helion turbo kit he hit a little over 800 @ the wheels last summer but he has run into a funky issue. He is a nice guy he respects the vetts so please don't say he needs to buy a vett 
I've already done that He has the passenger side O2 sensor is going haywire its reading all kinds of wierd readings in the data log. I was wondering if anyone here has ever run into this kind of issue with the LS1 running boost and having an O2 go crazy. We have replaced the O2 sensor, the complete main wire harness and the ECU still has a crazy O2 readings in the data log. Oh we also flow tested the injectors they are perfect. The data log is saying the short trim fuel table low but the car is currently running pig rich so if we add fuel the drivers side reads supper rich and the passenger side doesn't change is still says short trim fuel readings low.
Before you say it I know he needs to buy a vette.
It's a ford thing
Mustangs
and so on and so on
I'm hoping we can offer a fellow car guy some helpful advice to keep a nice guy from beating his head against the wall.
I've already done that He has the passenger side O2 sensor is going haywire its reading all kinds of wierd readings in the data log. I was wondering if anyone here has ever run into this kind of issue with the LS1 running boost and having an O2 go crazy. We have replaced the O2 sensor, the complete main wire harness and the ECU still has a crazy O2 readings in the data log. Oh we also flow tested the injectors they are perfect. The data log is saying the short trim fuel table low but the car is currently running pig rich so if we add fuel the drivers side reads supper rich and the passenger side doesn't change is still says short trim fuel readings low.Before you say it I know he needs to buy a vette.
It's a ford thing
Mustangs
and so on and so on
I'm hoping we can offer a fellow car guy some helpful advice to keep a nice guy from beating his head against the wall.
Last edited by LYCON; May 22, 2007 at 08:37 AM.
Le Mans Master
Joined: Dec 2000
Posts: 9,913
Likes: 1,867
From: Hot Springs AR
First thing that comes to mind:
He's got an exhaust leak. An exhaust leak upstream of the O2 sensor will pull outside air into the system, the O2 sensor reads the extra oxygen, the computer interprets this as lean, and adds fuel to that side.
HTH, and have a good one,
Mike
He's got an exhaust leak. An exhaust leak upstream of the O2 sensor will pull outside air into the system, the O2 sensor reads the extra oxygen, the computer interprets this as lean, and adds fuel to that side.
HTH, and have a good one,
Mike
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 951
Likes: 0
From: La Plata MD
Thank you VetteDRMR we will look into that
Does anyone else have any ideas so I may have a trouble shooting list to work from.
Does anyone else have any ideas so I may have a trouble shooting list to work from.
Last edited by LYCON; May 22, 2007 at 02:48 PM. Reason: misspelling
Instructor
Joined: Aug 2005
Posts: 177
Likes: 0
From: Little Elm, TX
Thinking Outsite the box
I am leaning towards an exhaust leak as well. It has to be sucking in extra air from somewhere or not getting a full load of fuel into the chamber to begin with. Good luck!
