Hi guys.
i own an Automatic 350z 2003 (vq35de).
When I floor the throttle and the car reaches high rpm and shifts to next gear, it goes into limp mode. Engine, TCS, Slip light comes on and the car won’t throttle over 2k rpm.

once I shut the engine off and on it’s fine again.
I’ve changed crank and cam sensors. All ignition coils are fine.

any help or suggestion is appreciated.

 

You need to pull codes rather than fire the parts canon anymore. Limp mode is designed to alert you of sensor readings that indicate potential safety or powertrain failures. If you continue to hit limp mode, you haven't addressed the actual problem. A good code reader should narrow the possibilities and there's a list of codes in the maintenance section to provide a description. The FSM can provide more detailed info if needed.

 

When you replaced the Crank and Cam sensors, did you buy OEM or some aftermarket stuff? For these cars, you really NEED to use OEM sensors, the aftermarket ones cause more problems than they solve.
-Icer

 

Both of these suggestions. ^^^ dkmura hits it right on the head regarding pulling codes. Stop shooting in the dark. Scan, interpret, action. You'll save a lot of time and headaches; not to mention money.

Just to tag on.... OE cam/crank sensors should be used or...the Hitachi OE equivalents. OEs are made by Hitachi. Everything else are pretty much cheap imitations (for some reason that I can't figure out. I mean, how bad can they be? But they are.) Some of the replacements are fine but why take chances? The originals/Hitachis may be a tad bit more expensive but ones gotta think long term... you wanna do it all over again?

Also, any recent changes in tires/wheels/sizes? And/or, the wheel speed sensors (AKA "ABS sensors") can be awry (or triggering the ECM due to a swap to new/improper size tires.)

 

It's a longshot, but could also be the alternator or even a blown fuse if none of the previously suggested ideas work for you.
I say this because I had a car once go into limp mode whenever I revved past 3k rpm as well, and my voltage regulator was the culprit, it was throwing 19v which was making the ECU go haywire.
It would shut down almost immediatly after throwing the limp mode light, though, and it wasn't a 350z or even a Nissan so I'm just throwing another suggestion in the basket, could be something else entirely