Car knocks when I start it
 

Yesterday my car shut off on me coming off the freeway onto the on ramp I restarted it, it turned on then it started knocking really loud and it slowly wanted to die i pulled over to a gas station let it sit for 30 mins start it again it knocked but not as loud then the knocking went away and the motor sound normal after that no leaks no check engine light or anything i got it towed didnt wanna risk driving it im lost on trying to figure out whats wrong with it oh yea I have a 2004 350z

sounds like cam sensors acting up. more times than not they won't throw a code until they completely fail, but will cause RPM stutters, misfires/knocking while accelerating and the car wanting to die at idle. Comes and goes like the wind, replace them with OEM, don't do aftermarket unless you want to get good at replacing them.

Thanks for the info
 

Thanks for the info I really don't know much about these cars it's my first 350z

I agree with comments from OldManZFL. The camshaft and crankshaft position sensors are very suspect in your problem report.

You certainly are experiencing a total failure so I would expect that you can get a code that reveals the problem component..

If you decide to replace the cam sensors, i have a NEW pair of OEM ones still in the package, purchased from the dealer - $160 shipped. PM me if interested ($220 new from Nissan)

How many miles on your Z? If after replacing with OEM genuine sensors and issue still exist, do the engine compression test on all 6 cylinders, be prepared emotionally and mentally for the outcome.