3500 RPM limit issue

FPenvy

well think of it this way it went into that mode because something was wrong and would have blown your transmission and cost you about $4k. i'll go with pulling over and restarting my car.

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324whp/258wtq AAM Tuned |F.I. NonRes CF CBE/NonRes TestPipes #373|UpRev Tuner|Akuma Motorsports Intakes|Z1 34 Row Oil Cooler

TedB370z

....AANNYYYWWWaaayyyyyyyy..... hah

I'm wondering if it is the crankshaft position sensor, since it was that catalytic converter on that side that failed, and also was red hot... for 40 bucks I'll just replace the sensor...

FPenvy

could be it. like i said when this happened to me it was just the AT sensor feeling something was wrong and hit limp mode.

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324whp/258wtq AAM Tuned |F.I. NonRes CF CBE/NonRes TestPipes #373|UpRev Tuner|Akuma Motorsports Intakes|Z1 34 Row Oil Cooler

TedB370z

The manual says no, most dealer says no, but other owners on this forum have posted they've had theirs flushed, even a few who said the dealer said it was necessary..

FPenvy

what i gathered from everything i read that changing the fluid in the 7AT is a bad thing. would i like to based on what i know about cars and wear, yes i would. am i going to? probably not. if something goes wrong then maybe i will. but 30k miles and not one issue aside from previously mentioned hiccup with a sensor tripping.

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324whp/258wtq AAM Tuned |F.I. NonRes CF CBE/NonRes TestPipes #373|UpRev Tuner|Akuma Motorsports Intakes|Z1 34 Row Oil Cooler

sandthepilot

I've been dealing with this issue for 3 years. Every time the nissan specialist would come out he couldn't re-create the issue. I sent him this link and videos i've taken myself. Luckily every "fix" they made was covered by nissan. Yesterday though he flew up again to see if he can duplicate this issue and finally it happened to him! He hooked up his data recorder to the car and got loads of data to take back to the engineers. If it ends up being a AT problem i'll be pissed because i just replaced my transmission back at 60,000 miles. I'm just glad he got the data that they were looking for in order to find a solution. my350z forum under 370z section, others have suggested MAF sensor, but we'll see and once i do get results i'll post them.

TedB370z

Yeah same here, even my 350z I had it flushed at 65,000 miles... but i'm hesitant, the one dealer basically said to me the transmission would fail/need replaced before the fluid would ever need changed.

FPenvy

same thing i've read many times.

supposedly it's good for over 100k miles.

the way i drive.....maybe 50k.

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JWillis72

I wouldn't let a dealership do it, it's a pain to do so I would only let someone I truly trust do it. I did it at only 12K miles but the car was 4 1/2 years old, I figured since the car has a lot more power I didn't want to trust old fluids to keep it safe.

Fountainhead

I've driven a lot of cars, MT and AT and never changed the transmission fluid in any of them, and they all lasted way over 100K. Just saying.

IDZRVIT

Me too. But some people do have a legitimate reason. Most don't but they read it on the internet that they need to. Same goes for oil changes at 3750 mile intervals. That's ok if you use your Z as a taxi in hot, humid climates. I'll stick with once a year or 7500 miles intervals. Also, never had an issue on any vehicles I've owned.

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juld0zer

how is your oil level?

TedB370z

I haven't had any issues since my last post in April. I just changed the oil again last week, and it wasn't low. I did talk to another 370z owner, who had the 3500 RPM limit issue and it was actually related to the seat belt tensioner... which, mine sometimes needs pulled on a few times after I get out to get it to retract, and he said his didn't throw a code, but his seatbelt wouldn't retract at all anymore... so I'm wondering if its related? but.. like I said, so far so good.

juld0zer

seatbelt pretensioner? man that would've taken forever to figure out! i do have an aftermarket amp for my woofer so i'm also considering the possibility of something weird on the brake light circuit. when i get my car back i will disconnect the amp and see what happens.

the seatbelt pretensioner is the pyrotechnic device which tensions the seatbelt in a crash. it's a bit different to the normal ratcheting mechanism which locks when you tug it (no electronics involved).

so for you, the crank sensor solved the problem? do you still have the old one? i need to gather some data on these sensors because the test in the FSM doesnt give me conclusive results

TedB370z

It only happened again that same day after I replaced the sensor, and hasn't happened since. Nah I threw it away... but I'll update if it does ever happen again and what steps I take next.