Incorrect AFR at WOT Help!!

[FoMoCoSHO]

I think its called the status monitor.....

When you press and hold for the add gauge function, scroll through all your options and I think it's in there....

 

[kskrew4life]

i found two widgets one says "Drive cycle status since DTC clear" and "Current Drive cycle status" thanks for pointing this out

 

[kskrew4life]

i captured a WOT session with the stock tune... the afr numbers look really off.. can someone confirm if i need to replace both o2 sensors based on this log? i still dont feel anything unusual with the car im at a lost whyt eh readings are so off,

 

[SHOdded]

You mean the lambda numbers?  Those are afr as a percentage of stoich for your fuel.  For example 14.7 for gasoline.  So lambda of 1 would be equivalent to afr of 14.7.

Havent looked at the two most recent logs yet.  In the midst of an emerrgency system rebuild.

 

[kskrew4life]

You mean the lambda numbers?  Those are afr as a percentage of stoich for your fuel.  For example 14.7 for gasoline.  So lambda of 1 would be equivalent to afr of 14.7.

Havent looked at the two most recent logs yet.  In the midst of an emergency system rebuild.

Yes i was looking up a lambda conversion chart but there was no entry above 1.405 lambda which translate to 20.66 afr... the last log is showing max at 2.00 !! with an average of 1.2.. those are really high values yet  there is no check light, no knock, nothing out of the ordinary as for as driving.

 

[FoMoCoSHO]

Kscrew, that is where you lifted and the car went into decel fuel cutoff which is normal.

 

[FoMoCoSHO]

You will also see high numbers as you transition in and out of that mode as well......

 

[FoMoCoSHO]

What are you logging with?

 

[kskrew4life]

Im using the SCT x4 device with the liveLink Gen-II. Torrie said both sensors in the log were not responding correctly, I have no idea what is going on

 

[kskrew4life]

Kscrew, that is where you lifted and the car went into decel fuel cutoff which is normal.

Thats a relief, i was kinda worried about that. thanks for explaining that

 

[FoMoCoSHO]

Im using the SCT x4 device with the liveLink Gen-II. Torrie said both sensors in the log were not responding correctly, I have no idea what is going on

Please post the log in native csv format and I ill look at it in Livelink

 

[kskrew4life]

Should I be saving it as datalog or as datalog view? Also I've tried to upload a log file save as datalog the size is 13mb so for some reason I can't upload it directly to this forum so I have to zip it.

 

[curry67]

as long as all the info is in view on the screen its ok to do that. if you want to have complete thing its all.

 

[kskrew4life]

Should I be saving it as datalog or as datalog view? Also I've tried to upload a log file save as datalog the size is 13mb so for some reason I can't upload it directly to this forum so I have to zip it.

attached zip file of last log

 

[SHOdded]

Does look the rear O2 sensor on bank 2 is lazy/slow to respond during WOT (based on measured AFR differences btwn banks).  Could also be a split pipe (near the clamp) or a loose clamp on the turbo piping.

 

[kskrew4life]

Does look the rear O2 sensor on bank 2 is lazy/slow to respond during WOT (based on measured AFR differences btwn banks).  Could also be a split pipe (near the clamp) or a loose clamp on the turbo piping.

Where would i find that split pipe / turbo piping? im assuming it would be under the engine cover

 

[SHOdded]

Taking the engine cover off makes it easier to see everything.  Follow the hoses coming out of/going into the intercooler for starters.  There are good pics in BiGMaC's writeup re:  hard hotpipes installation, found here:
http://www.ecoboostperformanceforum.com/index.php/topic,2248.msg32460.html#msg32460

 

[SHOnUup]

Does look the rear O2 sensor on bank 2 is lazy/slow to respond during WOT (based on measured AFR differences btwn banks).  Could also be a split pipe (near the clamp) or a loose clamp on the turbo piping.

Where would i find that split pipe / turbo piping? im assuming it would be under the engine cover

2 most likely spots...where they connect to the turbos

Rich

 

[ZSHO]

I would also mention a slow 02 sensor could be impacted by excessive purge vapors,probably also need to check anything afiliated in that department as well.  Z

 

[kskrew4life]

Thanks Guys for all the responses, i have attached another log i captured today. I was looking at the data in live link program ..i notice every time WOT is initiated the AFR lambda readings react up until a certain point.. then both will stop at random values after the rpm gets high.. its as if the system switches to open loop and the o2 sensors are ignored. then both will reset to 2.00 and start reading normally again with regular driving... has Anyone else noticed this in their logs?