I just bought this z and after driving it for a while I realized something was up. The previous owner said this has never happened to him and even sent me a video of it with full power just days before i bought it. But my full throttle seems to feel like half throttle and I will get a little blip of full power around 3500 rpm but that’s only for second. Both vdc and slip lights are on as well and my front right brake sometime pulsates when turning like the abs is going off and I can even be sent into a limp mode, but not always. The previous owner before me cut and put in a switch that taps into the yaw sensor to fully disable the traction control and abs, so I thought that must be the issue but even after removing the switch and requiring it back to stock this is still happening. I dont know if maybe from me trailering the car an hour and a half home it jolted something in the car that is making it do this but I can’t seem to find the fix for it.

 

Of course the previous owner is going to deny any problems, he's got his $$$$.
Obviously the yaw sensor is designed to measure 2 dimensional G forces. This data combined with the steering wheel angle is used to determine whether the vehicle is exceeding it's design limits and a crash is eminent.

I highly doubt the trailer ride caused new problems. Your best bet is to find the wiring schematic for the associated components of this system and check each wire or switch for tampering. Courtesyparts.com will have diagrams for free. If it were mine I'd unplug the ( - ) battery cable overnight and check all the fuse boxes. It might be as simple as a missing fuse. Gl!

 

I appreciate the help very much! Ill make sure to check the diagram. Do you think the power loss could be from a completely different problem as well? I keep thinking clutch, throttle body, exhaust may be clogged, fuel system, electrical system or accelerator pedal as well. However, the clutch engages just fine and the issue seems to be not exact, but pretty consistent which I believe these other possibilities would be a little more inconsistent and not in a certain rpm range like this. I dont know if I am getting too hung up on this yaw sensor for no reason or not. To me it seems like the car is freaking out due to this sensor and it’s now not acting right. I attached a video of what the issue is. This is second gear, full throttle, and as you can see it slowly accelerates. At about 3500 I get a quick blip of full power (you can hear it in the exhaust as well) and that’s it. From there it seems to hang out around 4000, I had to slow down, but usually it will then very slowly reach 5000 rpm. It is very hard to get even close to red line. Third gear is a little better, I’ll see if I can get a better video uploaded today of that, but it’s similar to this. Around this same range of rpm’s I’ll get about 3 blips of full power, then full power for a hood pull, and then I’ll hit around 4500 rpm and it’ll shut down again.

These are also my codes
tcs c/u performance function (p1211)
Ascd switch voltage signal out of range (p1564)
02 signal high bank 2 sensor 2 (p0158)
H02s2 (b2) heater control circuit low (p0057)
Do you think those 02 sensor codes could be playing a role? I tried replacing them but those codes are still there.

 

No one on this site has a "Crystal Ball" to diagnose the multiple problems the car is presenting. Perhaps you can take it to an affordable independent shop to get it running correctly.
GL!