rattling noise during 1st gear
 

I been noticing rattling noise during 1st gear when I take off on low rpm.. noise go away when I press down on the gas pedal and pick up speed. Its only happen in 1st gear. Anyone experience this? My car have 16K miles and its a manual transmission.

I think that's normal if just gently taking off without giving much gas. Try increasing revs as you launch and see if it goes away.

Yep its normal.

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I still don't think it's normal since the rattling noise only occurs on the 1st gear. I can understand when we "accidently" launch on 2nd or 3rd gear then the rattle is normal.

I hear the noise too, and not just in first gear. Its usually when the RPMS are low and there is load on the trans ie driving around a parking lot while in 2nd gear.

Transmissions in these cars are loud. I think better gear oil should help. I'm gonna do my grear oil change when I upgrade clutch&flywheel.

Nothing surprises me about our manual transmission anymore. I just wish it could pop popcorn when I'm driving.

I changed the clutch and trans oil with Redline. Still rattling :shakes head:

Well, kinda glad I'm not the only one hearing this in their car.

Its probably the dual mass flywheel rattling around.

The sound reminds me of some trucks actually

Yup. Same sound that will happen when you turn the car off with the clutch engaged.

It's this exactly.

It could be the power-wheel steering fluid.

turn up your music. problem solved.... or just get used to it. everyones stock tranny will be loud

what can we do to fix?

UPDATE: I notice that I don't hear any rattling noise in the morning when the car is cool. any thoughts?

Do you feel it in the pedal?

I used to feel it in the pedal when it was hot, not when it was cold.

Then my clutch master cylinder went out after the fluid boiled... replaced that, flushed with RBF600, no more rattle or pulsating pedal.

Take a pic of your clutch master cylinder with a camera, good light but not flash, so we can see the color/quality of the fluid.

http://www.the370z.com/attachment.ph...1&d=1363369660

what do u guys think?

how do i do a Fluid Flush? It don't look right. do u guys think i need to replace the clutch master cylinder? How many bottles of RBF600 do I need? What the best thing to do so this won't happen again? How much to flush if take to Nissan?

That definitely needs to be flushed.

No idea how much it will cost at dealer.

One pint should be sufficient.

thanks!!! what do you think cause the issues and how to keep it from happening again?

You could always do what the vette guys do and use a turkey-baster type device to suck the crap out the reservoir and pour new stuff in. As you drive, it'll cycle and dilute. Keep checking periodically and do the same thing until it's clean.

Just a suggestion if you don't want to pay for a flush or get under the vehicle.

It will Gravity bleed just about on it's own. Crack the bleeder and maintain the fluid level until u see fresh fluid coming out the bottom. Very simple!

wish you guys told me this sooner. Just paid $180 to get it done. Update: The rattling noise went away and notices my temp don't pass 200. Before my temp was around 230 on DD.

If I crack the bleeder how long will it take till I start seeing clean fluid coming out? Also will that damage the clutch if fluid is low? Any pics on where the bleed screw for the clutch is?

how long does it take for the Fluid to start getting brown again? Mine is starting to get dirty again. Its a light brown color right now and I just got it flushed about a week ago.

Up date: I made a video of the "rattling noise" you can hear it at 0:16 - 0:17 ....thats the sound I've been hearing.

370z rattling noise - YouTube

That noise is normal. It's just the clutch/throwout bearing being a little rattly. The 350 is the same way.

Keep the clutch depressed when you turn the car off and you won't hear it. You'll get it every now and then when shifting in a low gear depending on your technique.

:tiphat::tiphat: Thanks!

Bump, I'm interested in learning how to flush this easily since I'm pretty sure the tranny fluid in my 370z is brown as well

Use a syringe to suck out the resevoir then fill with fresh fluid.... pump clutch with car off about 20 times and repeat until fluid remains clean. Do this once a week for a few times then twice a month.


Clutch rattle is actually the flywheel and is normal. Do NOT get a aftermarket lightweight flywheel if that noise annoys you.

Thanks man!

What is a good recommended fluid to do this with? Sounds like I'll be busy this weekend


EDIT: Yeah, I don't plan on changing the flywheel, I was scared of the clunk at first but I actually like it, makes me feel like I'm in a real car :ugh2:

Looked at the video that's normal like others have said. Had it for 4 years now there was a long long thread back in the day about the same thing result was just acceptance that it's normal.

Dot 4 brake fluid

everything in the 370z was designed to rattle, on purpose, engineered to. So basically, yeah it is normal.

Its the wear out bearing on ur csc thats rattling, absolutely normal except if its making that sound on 2nd n 3rd gear that means its life is almost diminished.

:roflpuke2::roflpuke2::roflpuke2:

this will let me sleep at night

I 2nd that.

rattling noise when taking off in 1st, almost sounds like exhaust rattle
 

2009 370 z M6

Dont listen to anyone if they tell you that this noise is normal...if youre anything like me when it comes to my toys im exceptionally "OCD" shall we say about anything that feels or sounds like it could be a problem. That being said, ive looked into this noise because my car just recently started making it, but ive heard other cars throughout my life make the same noise, so it wouldnt be a manufacturer spec. problem. Then i YouTubed any videos i could find to see if i could hear a replication of the noise. After a few hours and some research, along with my auto tech history and knowledge i came to my own conclusion, which is....

Because the sound is only at low RPMs
always taking off from a slow or dead stop
goes away when the car is up to speed and rpms are up
and seems to only happen when the clutch is engaged (pedal NOT pressed)
i believe that the problem comes from and input shaft bearing or a pilot bearing, when these wear and there is play it will cause the clutch to engage with the pressure plate not quite exactly dead center this makes a harmonic vibration or a chatter noise that is amplified by the bell houseing of the transmission. When the Rpms rise the clutch disc spins faster causing centrifugal force to align the clutch and pressure plate and balance the shaft. Thus no more vibration, and no more noise. All that said the bearing isnt really going to cause any mechanical problems, at least initially however, if the wear becomes too excessive i suppose it could cause alignment issues in the transmission... but personally i cant stand the rattle so for peace of mind i just think ill replace all bearings, may as well they are cheap and if it needs to be taken apart for one might as well get ahead on preventative maint... ill follow up after the service to confirm or feel stupid and apologize..

NOT to be confused with a throwout bearing.....pilot/input bearing.

I could be wrong but from what ive seen, read, and experienced this is my theory.
https://youtu.be/nWWi74xKt8A