ill let the video do the talking.

most recent mods are gsc s2s and e85


tuner also replaced throttle body shaft seal

 

I had the same issue, front 02 sensor was going bad

 

mine is kinda doing that now.. im going to mess with it and see what gives..

you can put your idle on open loop and adjust the fuel via the fuel map and its pretty solid with this method, but of course it might mess up cold start and such until the car is fully warmed up..

 

oxygen sensor is a year old, think it went that quick?

 

deleting egr this weekend and checking for a boost leak too

 

did yours throw a code?

 

Yes the code would come and go until I replaced it. It could be a number of things though. The latencies could be off or you could have a voltage issue. Looks like the AFR's start swinging when fan kicks on.

 

yeah i don't have evoscan or anything to look into the parameters. voltage issues sound scary.

 

Try to get someone to log it on evoscan

 

Any updates on this?.....Did the oscillation begin when you the made switch to E85?

 

No updates. When you look at the maf when logging it just jumps from 35 to as high as 61 hz for no reason. Was doing it before e85 but not as bad

 

is your PCV valve still on or was that deleted?

 

Any updates?