What's causing this??

[turbonut85]

I took my GN on it's longest trip thus far after getting it done. As I was cruising down the interstate, my o2's started out bouncing around the upper 500's to lower 600's. After dirving it for a couple of hours the o2's would gradually fall all the way down to where they were bouncing in the 200-300 range. The car was running ok form what I could tell, but as I was cruising, if I lightly let up on the throttle, it would seem to shutter slightly. I got home fine, but when I started the car this afternoon, this is what blew out of my tailpipes. Black, dusty soot. What would cause this?? BLM's are hanging around the 117-121 mark at idle. Any thoughts??

 

[BRAD_PADGETT]

Keith- Good to see you yesterday. The only advice I can give is check your fuel pressure. Should be 43 line off at idle. Brad

 

[charlief1]

X2 with Brad. Check your pressure and see where it's at

 

[turbonut85]

Would an exhaust leak after the turbo cause this?

 

[charlief1]

Your O2 sensor is after the turbo keith? That's the only way I could see that happening.