Ok fella's,
Let me pick your brain. I bought a 2015 SHO built by Auto-Motion in Louisville, KY. Mods include a single turbo upgrade, and meth kit. Other than that it is stock. It does have the 3 bar map sensor, and LMS exhaust, and custom tuned.
After buying the car for a really good price, I called the builder and got some back history on the car. The original owner wanted a 500hp daily driver fun car. It made that. The builder told me it 502 on the dyno. not bad.
So since I have owned the car I have been chasing a misfire and other codes. So let me describe the build and whats going on. There are custom uppipes to a T4 flange, The 70mm Turbo is now where the battery was, the battery was relocated to the trunk. The down pipe is custom and connects to the LMS exhaust. Both upstream O2 sensors are located in the DP just beyond the the turbo. Each uppipe has its own waste gate and there is a blow off valve in there as well. There is an alky kit installed, with the controller in the glove box.
Now my problems are I constantly get a list of codes.
0020 Camshaft Position Sensor
0300 Random Misfire
0304
0305
0306
0131 O2 sensor
0152 O2 Sensor High Voltage Bank 2
2198 O2 sensor Bank 2 stuck rich
The weird thing is I can clear codes and drive it with no problems, other times it will misfire for miles upon miles. Even with the CEL on, I can start it take off no problems and then poof random misfires. I never know when it will occur. Take for instance I jumped in it Sat morning drove it 40 miles, never misfired or anything. Stopped for about 20 minutes, restarted the car and took off and blam, misfired for 10 miles, then just stopped and acted normal again. Drove it home no problems again.
Could this be caused by the both O2 sensors being in the Downpipe right next to each other? I changed plugs, oil and even moved CP around with the plug change and still have no luck. Any ideas would be great. I am thinking of dropping in a wideband O2 just to look at whats happening.
jay
