I have a 2003 350z with a Vortech supercharger. During WOT it is missing above 4k rpm's. Can it be associated with dtc I'm getting for both bank 1 O2 sensors? I installed all 4 O2 sensors with new ones about 2 weeks ago but still get the codes for both bank 1 sensors. Please help!

 

don't know what you are doing.... suggest you pay someone who does

 

Thanks for your help! I come to this forum for some direction and help troubleshooting. Is everyone as generous with knowledge on this forum as you?

 

No one knows your build. No one is there to diagnose it. How can we even come close to point you in the right direction?

 

oh, i am sorry. let me gaze into my internet mechanics crystal ball.......

 

what DTC are you getting? what do you mean its missing? what else is done to the car?

cant really make even a guess at what the problem is with out having more facts to work with, but you may want to look at your fuel system (fuel pump, lines, injectors) and maybe check coil packs.... but that just a wild *** guess...

 

I am limited in what help i can offer but ill try. Could be alot of things. Old/fouled spark plugs, dirty mass airflow sensor, you could of went up a pulley and your fuel compensation in your tune isnt calibrated for the extra airflow/boost, etc. What did you do last to the car besides the O2s?

 

I bought the car with this issue. I have cleaned the MAF and new plugs. I'm am getting a p0031 and p0037 dtc for 02 sensors front and back bank 1. Even after changing all 4 sensors I still get that code after 2 key cycles. Installed a fuel pressure guage. I'm getting just under 50 psi during idle and normal driving and at 5 lbs of boost I'm pegging out my 100 psi guage. I have not checked the coils but I'm getting no misfire codes.

 

If your fueling is fine, which seems so, im guessing your tune needs tweeking to richen up your powerband at 5psi and up. Try troubleshooting and increase your fuel compensation on your tune. Also alot of times, test pipes or HFC get exhaust leaks thru cracks in welds around the post cat O2s giving false lean condition readings, gaskets failing where the header and test pipe meet also can cause this. Just my .02 in what i would look at next. Good luck.

 

I'm no expert here, but I'm curious because I run a boost referenced fuel return setup on my vortech Z...

How/Why are you hitting 100 PSI of fuel pressure? I set my base pressure at 40 PSI and see about 51-52 PSI at redline.

 

That also seemed really wrong to me. I also have a boost ref return, and the fuel pressure goes up by the boost. That's the point.

Does the car have a return fuel system? Or are you measuring oil pressure by mistake (numbers seem about right)?

 

It is fuel pressure, vortech tech seem to think it was a little high. He said I should not be seeing over 100 psi at only 5 lbs of boost.