went out to log today everything was running perfect and then it pegged out 10.0 again im about ready to crash this mother ****** into a wall and just get another car.

Recap on what iv done so far.
I have no cels when this happens
cleaned maf and map sensors.
changed spark plugs to copper type.
James said may be a faulty upstream o2 sensor so im install this new one I have today but I always thought faulty o2 sensor throw cels.

 

Force the car into open loop for a day and see if it dose it.

 

Is the car going rich during Wot?

Also run the car with only speed density only then try MAF only.
I wonder if u have something out of wack there..

 

ok i just looked into my logs and iv got a pic of my car doing a 2nd gear pull when its running normal and when its pegged rich ill post them and tell me what ya think.

update- uploading now.

 

2nd gear normal pull afr of 11.0


2nd gear pull pegged rich 10.0 afr

 

Something is happening in the airflow that causes it to jump from 8.77 to 41.00 and that causes my injectors to pump out more fuel from 65% to 86% does this help explain what is broke? lol

 

Well on the first pic ur car isn't at operating temp. 140*

The second one it is..there could be somethin there.

 

Put the car in speed density and see wat happends..
Wonder wat ur commanded afr is also

 

First pic cold motor? Also how can u be at 32psi and only flow 8 lb/min?

 

I hope hes not at 32 psi or that is one spun M62 lol

 

my car is not at 32 psi that is the airflow people lol. the car being only 140 does not effect the 8.77 ill post a pic of 3rd gear pull that is the same way.

 

11.0 is what my afr is when its not ******* up and what is speed density and how to i put my car in it?

 

Bad 02 sensor

 

You have to subtract barometric air pressure.

 

17.3?

 

Had a derp moment. Also thought he was Turbo swapped so 32 psi and 41 lb/min kinda lined up in my head lol.

Ok carry on haha.

 

this is a 3rd gear pull at running temps with a 8.91 ve airflow and 67 injector duty

 

upstream sensor? i have no code but im guessing that could be it lol

 

He's flowing 33.86 lbs/min (MAF)....

Sounds like a bad O2 sensor to me as well.

 

well im replace the o2 sensor today, do yall think that is whats causing the ve airflow(red one) to spike from 8-9 to 41 and making me dump fuel?

 

Yes. What did the old sensor look like when you pulled it?

 

 

never pulled it yet iv got to get the tools after lunch.

 

Ok.... Sounds good.

Post up your findings when you get to it.

 

Could be a slow sensor. Happened on a couple of cars I've looked at. I would replace it and report back.