superpreditor

I purchased a 2004 350z approximately 5 weeks ago and I'm having trouble getting the motor to aggressively after 4000rpm in any gear. Car runs fine under 4000 rpm. I have no CEL codes. So far I have replaced the MAF, CAM sensors, Electronic Throttle Body and most recently I've replaced the factory ECU with a Haltech Platinum Pro.
The problem still persists, I believe the problem may be mechanical. Any Ideas?

VenomGT9

iTrader: (1)

Limp mode?
What exactly is it doing once it hits 4K, just gives out like hitting redline or...?

bith8791

Limp mode shouldn't allow it to reach 4k RPM.
I was going to be a smart *** and say it was VDC kicking in, when my tires slip in 2nd at 4k my z loses power too because VDC is doing it's job and keeping me in check, LOL.

travlee

iTrader: (8)

so you are just throwing random parts at it... with all that money, you could have taken it to nissan for a proper diagnosis

bith8791

What trav said seriously, one $90 visit would have led to an answer and money saved.

VenomGT9

iTrader: (1)

Post a video if you can or as mentioned above, go get it diagnosed.

Joe clan

The cat's might be going bad. You will have a great power loss with bad cat's.

superpreditor

Thanks for the replys gentlemen. I discovered the problem to be an exhaust blockage.

Joe clan

Was it in the cat? If so what do I win??? Lol man I am good! I have been working and rebuilding cars for far too long.

mrrocketfingers

where I. The exhaust I'm having the same issue