i have noise problem help!
 

anyway it happens whenever i stop and trying to take off.
i push gas pedal and it makes strange noise like (i dont know how to explain this) and feel little vibration also,,, it seems its coming from engine,, i took it to the dealership couple times n they said everything is fine,, all they said was it could be bad gasoline?? that doesnt make any sence cause i use shell v power so confuse right now
any help would appreciate,,
here is link to video
start listen from 42 sec plz!!
http://m.youtube.com/watch?v=9474gBsO0ik

Ok...... So what is the problem exactly?

sorry ,, im trying upload video tha i have,,

edited,, video is up!! any help appreciated!!

I clicked on the link & then I clicked on the actually video & it said video can not be displayed. So then I decided to click on the words that say WATCH VIDEO & it is taking forever & a day to load up.

I don't think it's bad gasoline because the engine doesn't sound like it's pinging??
I would only hope that if your oil is where it supposed to be? That maybe it's a noisy throwout bearing.
Its kinda hard to diagnose with a short video and not physically being there to get a good feel of were exactly the noise is coming from.

yea,, this is really annoying,,i just hope someone gives me a solution for this
im just gonna have to go back to dealership again:shakes head:

I couldn't really tell listeningto the video from my iPhone. Will try my computer.

Thx!! yea u ll need earphone to hear better on ur phone,,
computer will let u hear more clearly!

are you talking about the noise similar to what a semi truck would make from their stop-go situation??

says video not found when i try to open it...i wonder if it is the same noise i am getting, the best way i can explain it is like a metal ball that you drop and it bounces lower and lower and lower, i haven't had any time to look at it and see what it is or where it is exactly coming from. someone hit me a few months ago i figured it was from that but not entirely sure until i have time to diagnose. weird thing is it doesn't happen all the time for me just here and there and only when i take off and when i am stopping.

sounds like you have a diesel powered Z. um... low oil?

Have you checked to see what you oil level is at? FYI.......... If you are going to fill up & you see a tanker truck there putting gas in the tanks do not get gas. The reason is that all the crap from the bottom of the tanks will float up to the top.

i dont know y video is not working for some people :shakes head:
anyway it sound like knocking very fast on thick metal piece,, it doesnt happen all the time for me too,,

i changed oil abt month ago,,i still have abt half

Vtc solenoids

Video is not working for some people because you posted the mobile link which is rtsp and not normal youtube. This should work for people:



Link:
370z noise - YouTube

loose heat shield? It may also be not loose but just too close to exhaust. The heat shield above the back crossmember will rattle if too close to the vibrating exhaust. It's hard to tell in the video. Does it also make the noise in park or nuetral?

try a differnet dealership

thank u for fixing it

not in park or nuetral ,, only when car is stop n accelerate,,but it happen radomly

It is something, but bad gas is not my first inclination.

Found this thread while searching the forums for this particular issue so please forgive me for bumping such an old topic. I have a 09 Z with a little over 85,000 miles now making the exact same noise in the video maro posted. Sounds like a truck when it takes off. It only happens randomly so it's hard to mimic but I noticed it only happens in gear at low rpms. Has anyone else ever had this issue and figured out what was the cause?

I am in agreeable state with you sir! The cross member must be bent up a bit and needs to be bent down OR the exhaust is pushed to far down and under low load or downshifting is causing the Y pipe to vibrate more then usually hitting the cross member. When I switched to downpipes this same issue happened with me, had to press the cross brace down a bit to give more clearance, otherwise overtime I accelerated or downshifted it rattled bad.

Hope this helps!

Everything seems fine under the car. Nothing bent or anything. I have a stock exhaust too so nothing was ever changed either. Was thinking maybe something with the engine or transmission maybe? Only hear it randomly so it's hard to pinpoint.

It definitely doesn't sound right to me. Almost sounds like it could be a leak at the exhaust or intake manifold, or maybe in the EGR valve system.