2006 Lean out issue
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
2006 Lean out issue
So I have a question. I got my car back together ls2 that is now a 404 6.6l. Stock injectors tune prior to the motor dying and rebuild. I have a p050 and p030 O2 code. And when I'm driving around my sub testing. Starts out fine. But seems after a few mins driving after warming up a lil it will lean out heavily. Like 18 on my aem gauge. Trying to diagnose it so looking for suggestions
another guy gave me some advice to try so i am going to do that. I just wanted to see what everyone else thought as well. I did try a vacuum leak test this morning and that passed. ( spraying water around everything intake area)
https://www.youtube.com/watch?v=VYUA...ature=youtu.be
idle
another guy gave me some advice to try so i am going to do that. I just wanted to see what everyone else thought as well. I did try a vacuum leak test this morning and that passed. ( spraying water around everything intake area)
https://www.youtube.com/watch?v=VYUA...ature=youtu.be
idle
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
Need a log with fuel trims first. A copy of the tune would be nice too.
My guess is basically fuel trims are probably pretty far positive which is keeping you around 14.7 at first. Once you get the O2 codes it goes into open loop, ignores O2 sensors, and then you have no correction and end up lean.
I'm not sure what's the most common reason for those codes though.
Are you running MAF only or SD or what? If you're running the 100% stock tune with a larger displacement engine, that probably isn't helping.
My guess is basically fuel trims are probably pretty far positive which is keeping you around 14.7 at first. Once you get the O2 codes it goes into open loop, ignores O2 sensors, and then you have no correction and end up lean.
I'm not sure what's the most common reason for those codes though.
Are you running MAF only or SD or what? If you're running the 100% stock tune with a larger displacement engine, that probably isn't helping.
Racer
Joined: Nov 2007
Posts: 260
Likes: 7
From: Aledo TX
With those codes I would start with looking at the O2 sensors. Those codes suggest that there is either an open or a short in the O2 heater circuit, either in the sensor itself or the heater circuit wiring. Unplug the sensors and check the resistance of the sensor's heater circuit. Also check the wiring in the car for any corrosion on the terminals or damaged wiring. Wires could have been damaged during engine removal or install.
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
the motor was originally tuned for headers, vengence vr5 cam and a intake.. now its a fully forged motor with a bigger crank and diff cam....
yea i wish i could get my hands on the tune no access....
I had a MaF
I did order new o2 extensions from texas speed gonna try those...
sucks the o2s were fine prior to removal and its both of the front ones..
how do i check resistance,. i did just buy a volt meter dont know hwo to use it much lol
yea i wish i could get my hands on the tune no access....
I had a MaF
I did order new o2 extensions from texas speed gonna try those...
sucks the o2s were fine prior to removal and its both of the front ones..
how do i check resistance,. i did just buy a volt meter dont know hwo to use it much lol
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Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
What are you using to get those screenshots in the first post?
Dash command is an app that can at least read fuel trims and O2 voltage readings. That would be good info to have in figuring out what's wrong. Not sure if it will work with whatever device you're using, but just throwing it out there
Dash command is an app that can at least read fuel trims and O2 voltage readings. That would be good info to have in figuring out what's wrong. Not sure if it will work with whatever device you're using, but just throwing it out there
Racer
Joined: Nov 2007
Posts: 260
Likes: 7
From: Aledo TX
The heater wire colors in the harness should be brown and black. Set the meter to ohms and test the corresponding pins on the sensor side. The polarity of your test leads does not matter. You should see somewhere in the neighborhood of 4-6 ohms. If the meter reads OL then there is an open in the sensor heater circuit. If the sensor checks out I would start looking at the vehicle harness wiring.
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
What are you using to get those screenshots in the first post?
Dash command is an app that can at least read fuel trims and O2 voltage readings. That would be good info to have in figuring out what's wrong. Not sure if it will work with whatever device you're using, but just throwing it out there
Dash command is an app that can at least read fuel trims and O2 voltage readings. That would be good info to have in figuring out what's wrong. Not sure if it will work with whatever device you're using, but just throwing it out there
is dash command a pc prog or a android app?
Thread Starter
Safety Car
Joined: Jun 2011
Posts: 4,352
Likes: 32
From: Canton Michigan
The heater wire colors in the harness should be brown and black. Set the meter to ohms and test the corresponding pins on the sensor side. The polarity of your test leads does not matter. You should see somewhere in the neighborhood of 4-6 ohms. If the meter reads OL then there is an open in the sensor heater circuit. If the sensor checks out I would start looking at the vehicle harness wiring.
