I have a question. When I'm cruising around and i'm around 3-3.5k rpm, my turbo starts to studder. I was told that the turbo was "front loading" which i totally didnt understand. I'm a little concerned b/c sometimes when it happens my egt will go way down but my afr will go really lean >17.2 and to get it to stop i have to let off the throttle then come back on. Just out of cursoity, when it started doing it I pushed on the gas and i made like 10psi, but it started getting worse so i let off. i've read about the turbo surge and how the car will buck, but it doesnt buck. I think i read on here where it was happening to people and it was their bovs messing up. Anyways, any help or suggestions is greatly appreciated.

 

low egt and lean doesn't make sense.... though, that's only reading one cylinder (assuming it's in the manifold) Hmmm....

 

its not the utec switching map is it?

 

i know it doesnt make sense. my egts are normally around 1300-1450 and i had just come onto the highway and it started studdering again, but didnt realize it. next thing i knew my egts were like 400 and i thought that something was wrong with it. now that i have my ugeo afr installed, i can watch it when it happens and as soon as it starts studdering the light and numbers "- - - " bottom out on the lean side.
i've thought that it was possibly the bov since i know that if its a vta it would lean out the car. if this was so, if at that particular rpm and the bov started fluttering open then it might be it. still it doesnt make sense b/c it should happen more so at higher rpms and it doesnt.

 

its not switching maps either, i verified this when i hooked up my laptop to it to see what the engine was really doing and it wasnt even pulling timing.?