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Maintenance & Repair 350Z up keep and diagnosing/fixing problems

Mystery Problem

Old 10-14-2011 | 05:14 PM
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Default Mystery Problem

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!
Old 10-14-2011 | 05:19 PM
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possible bad plugs/coils maybe? sounds like its in limp mode too, but 4.5k is weird
Old 10-14-2011 | 06:04 PM
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have you done any trial/error to figure out what's up?
Old 10-14-2011 | 07:06 PM
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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.
Old 11-01-2011 | 03:04 PM
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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
Old 11-01-2011 | 06:10 PM
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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?
Old 11-01-2011 | 06:25 PM
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What year is your Z and how many miles?
Old 11-01-2011 | 06:32 PM
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04 and it has 79k
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