Hey, I just recently purchased my 350z used and inherited several problems. I've taken it to multiple mechanics who all recited the same code - a crankshaft position sensor malfunction. The symptoms started when I was driving and the RPMs dropped to 0 momentarily and then returned; I came back to the car after having parked it for an hour or so and it wouldn't start. I had the crank sensor replaced twice (the first considered to be a faulty part) and it starts, and drives but there are still issues. The car red-lines at about 4500 RPMs now, there is a clearly audible scratching noise when hitting about 3000 RPMs, the car jerks several times after releasing the gas pedal, and yet the only code popping up is still the crankshaft O_o... If someone could help out that'd be GREATLY appreciated, I know very little about cars!

 

possible bad plugs/coils maybe? sounds like its in limp mode too, but 4.5k is weird

 

have you done any trial/error to figure out what's up?

 

Not necessarily, I've had some friends look specifically at the clutch, with fiber optics, and concentrated test drives by transmission experts; the only problem (although pretty significant) was that the pressure plate was missing small pieces on the outside, but I don't understand how that would cause it to red-line early?

Also: Whenever it hits the 4500 RPM mark the VDC and SLIP warning lights flash and stay on til I turn off and restart the car.

 

ok... the car is still in limp mode. limited at like 5k or whatever but the check engine light isnt on anymore. my friend and i are very new to 350z's, where is a good wright on trouble shooting this type of problem? and if anyone can shed some light on this situation please let me know. thanks

 

i got the the codes checked and it was p0011 and p0021 and p0335. one of the things that i found for the IVT codes was most commonly caused by low oil. i checked it and it had like a quart of oil in it. i dont know how the shop that did the crank sensor swap missed that but whatever. so i did and oil change and disconected my batery and the codes are now gone but it still hits the rev limiter at 4.5k i must say it runs real nice up until that point but idk? another thing i found was people with this sort of issue all had recently replaced their clutches and mine was replaced (poorly) before i got it. i checked the connections on the sensors on the trans and MAF. any ideas?

 

What year is your Z and how many miles?

 

04 and it has 79k