Hello all, I'm new to this forum as well as in the Z family. I apologize in advance for the long post, but I'm very frustrated so please bear with me.

P2135 Throttle Position Sensor
P1212 ABS/TCS Communication Line
U1000 CAN* Comm Circuit

2 weeks ago I got my 2004 350Z Track Level 2 (left dealer at September 2006). When I got it, I checked it at a Nissan dealer, hooked it up on Consult-II, and everything came out fine. It was driving perfectly fine up until 2 days ago. I did an oil change and after the oil change the car felt a bit slower than normal, as if it didn't have the same power throughout the band - it doesn't rev up or put down power the same way as before.

On top of that, 1 day after that, while i was slowly cruising in the city, suddenly it went into "limp mode", with SES, TCS and Anti-slip lights on. I parked somewhere, restarted the car and I could drive fine afterwards, except for the SES light that stayed there.

I took it to the same guy (service-shop) where I changed the oil (not a Nissan dealer, nor an authorized service but the guy was previously and for many years chief-engineer at a Nissan dealership and people get their GTRs to him and I was getting my previous car to him and I trust him more or less), and we hooked it up on Consult-II. It gave P2135, P1212, U1000. We cleared them, and he enabled all the re-learning procedures, I drove it for like an hour, no difference. I took it back and we were fighting with it for like 6 hours in order to understand what's wrong with it, and after running all kinds of tests through Consult and cleaning the throttle body, in the end he told me that it's my flywheel and that we can put a lightweight flywheel + a new clutch. I understand that the flywheel can cause acceleration issues, but I don't believe that my problem is there, because a flywheel won't give out can comm failure errors, or abs errors. He's basing this theory, on the noise that the flywheel does when the car is idling, and that the noise disappears when you press down the clutch. As far as I know, even with the stock dmf there's still some light flywheel noise at idle.

Since when we cleared the errors they haven't come up since, and the car hasn't gone in limp mode since, but it still feels underpowered. Ok, I know that this is a subjective thing but I'm not driving the car for years, I just had it for 2 weeks.

Apart from the above, If I change from 1st to 2nd at high revs, the 2nd gear will grind. That could be a synchro. Also the other day, when I was trying to measure some 0-60, when I started the car from 1st, the clutch would stick to the floor. It tried it twice, and it did the same thing. I'm not a race driver or anything but I've been driving stick my whole life, so I know how to launch a car decently. This could be a master or slave cylinder, no?

The thing is that I don't want to give 1000$ for a new flywheel and clutch and discover that the issue is still there, and it was caused by a grounding issue or something.

I am not confident that if I take to Nissan they will find out what it is.

I have thought of whatever I could, I even thought that they put more oil in it, and that oil went in the TB and spark plugs, and that's causing the performance issue.

Again sorry for the long post, if anybody has any ideas, I would be more than grateful.

 

Nissan will do the same thing and hook it up to consult. The grinding in second gear is a synchro issue and that would require a trans rebuild or replace.

Could be the clutch if the rpm will just shoot up and there is no acceleration then it's gone. You could get asecond opopinion just to make sure. I don't see why it would go into limp mode if the clutch and flywheel are bad. Your mechanic seems pretty smart though if he has worked on gtr and head mechanic at Nissan.

 

Thank you for your time.

No, that's the thing, the rpm are raising normally, just maybe slower than normal, I don't have an issue with the clutch, apart from maybe a bad master/slave cylinder.

Tomorrow I'll get my Z to the guy, we' ll clean the MAF sensor, and maybe replace clutch fluid and gearbox oil.

Because 0-60 depends on traction and driver, I think the best way to see if the car goes as it should, is to measure some 60-100 for example. Where can I get accurate results for that for my 287hp version?

Thanks again.

 

throttle position sensor code is most likely the key. Try another throttle body and relearn it.

But if you're not throwing any more codes it is probably running normally. The only thing I've seen that ffects performance without lighting up the SES light is knock sensor codes. But if there are no codes I doubt you have a problem.

 

Guys, thank you for the replies.

It hasn't given me an SES so far. I took her out today to check acceleration times and they seem pretty OK, 60-80mph is around 3-4 seconds (from 3rd gear - that was with a 2nd passenger in), what do you guys think?

The flywheel still sounds a bit fishy, so I'll probably go ahead and replace that with a lightweight one + clutch (exedy or JWT).

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P.S: I just took my old reliable Toyota Avensis 1.6 110ps mk1 for a spin and I felt I was in a tractor, after 2 weeks of driving the Z. Being now used in the short shifting of the Z, I felt I needed 2 arms to put 5th in...