Strange Noise

[NISMO-61]

Hi all,

I have got a 2001 300GT v35، currentle at 90.000km . Quite recentle i recognized that when i go over 70km/h , some kind of noise is coming from the car. Its like driving on an unevensurface road. It keeps making that humming noise, no so loud but still annoying. When i drive, it feels like the noise is coming from the back of the car, i assume it might be the exhaust system related issue, but not sure. By the way as u know v35s have dual exhaust outlets at the end of thecar where the smoke comes out. When the car is in idle, it seems like only one of them is active. No smoke is coing out of the second one. Is it normal or do i have an issue. When u step on the accelerator, the second one is also becoming active in my case.

Thanks in advance

[reverseworm]

My 300GT has a single exhaust - I thought it was only the 350's that had dual exhaust?

Could your noise be a wheel bearing? Is it on one side of the car or both?

[t5iv]

+1 Rear wheel bearings are going.

[sonicii]

My 300GT has a single exhaust - I thought it was only the 350's that had dual exhaust?

Only the Coupe gets the dual exhaust (which is really just dual rear mufflers, not a full dual system)

[PN-Mad]

Derp is talking about the rear can has 2 outlets. It not brokken, it's how Nissan designed it. Low flow, one outlet, high flow, both flow higher flow. Like BMW, merc, and lots of other makers.

As for the noise, as has been mentioned before try servicing the flux capacitor. Or maybe try tyres and or bearings. Or could even be worn out diff with massive Kms.

[NISMO-61]

Thanks for your contributions guys. Highly appreciated.

I have just checked the rear wheels and it seems like there is nothing wrong with the bearings as when I spin the wheels there is no disturbing noise. and I reckon bearing would make a grinding noise as metals touch each other. However in my case its more of an exhaust sound. you know the custom exhaust systems that make 'vuuuuuuuuuuuuuu' kind of sound. Mine is similar. It's not too loud but still disturbing as I like quite rides.

The exhaust thing I was talking about; I think I was misunderstood. 300GT and 250GT has single exhaust outlet with double tips. So mine has double pipes on the left hand side under the fuel tank. The questions was when the car is in idle, smoke comes out of only one of the pipes. the one on the right hand side is pretty much dead. however if you step on the accelerator then the second one turn on . So it might be the way it should be or is there something wrong.

[iamhe77]

I know of no exhausts that sound like a vacuum cleaner (except on GT5). Perhaps get a sample of this sound and post it.

Derp is talking about the rear can has 2 outlets. It not brokken, it's how Nissan designed it. Low flow, one outlet, high flow, both flow higher flow. Like BMW, merc, and lots of other makers.

This fella has the answer

[sonicii]

It could still be a wheel bearing.. just because you can't hear it make any noise when turning by hand, doesn't mean it isn't bad, if you could hear it when turning it by hand, it would be 'screaming' at 60km/h. If it is an exhaust issue, I would expect the noise to change depending what you do with the throttle.

Still confused by your exhaust setup.. my 350 has a single pipe with a dual outlet final muffler.. keeping in mind the fuel tank is under the rear seats and therefore well before the final muffler, I am interested to see how yours is setup

[R6n350GT]

servicing the flux capacitor, LOL

Well to check wheel bearing you are doing it wrong

Jack rear up so wheel is of the ground

May be easier with wheel off but you need to grip the rotor (or wheel) either side and then push with one hand and pull the other, alternate this back and forth and see if you can feel any movement, should be 0.

Do the same thing but top and bottom ...

Check all rubber mounts along the exhaust, get someone to accelerate slowly while in park and see if you can hear the noise..

Get someone to drive the car and follow it and see if you can see anything

As for exhaust not being true dual in the coupe... well they sort of are as its a V6, two headers, two cats and then a Y pipe that then converges it to a single midpipe and then muffler with 2 tips that flow the same (AM anyway). If you get a dual cat back exhaust then its full dual.

[scotty nm35]

Good one Nate, those of us on the "dark side' black screen cant read a word of that. Perhaps you could change your font color?

The muffler has a flap inside to block flow to one tip unless you need it. (not much chance of that with the NA) Sometimes this can get blocked or seize, so you should get someone to check it by hanging out the window as you boot it up the freeway.

[t5iv]

Scott, think my flux capacitor is rooted. Can you check it? kthanxbye.

Also, is the OP asking two different qs? So confused right now...

[NISMO-61]

The noise is still there and it's getting louder as you go faster. We will check the rear bearings tomorrow.

I have recently discovered another issue which is bloody strange. I dont know the name of the part bu I have attached the picture. The arrows point the location where i get 'tik tik tik tik' kind of sound (as if something is broken inside) when u accelerate in idle. you just hear it when you get up to 1000rpm and then its gone. you don't hear it while driving. what the hell is wrong with that thing?

it shouldnt make that sound right?

What is that thing sitting on top of the engine?

[PN-Mad]

Recommend never going below 1000rpm.

Could again be your flux capacitor, but then again could be the woodpecker valve which emits a ticcy tippy noise. It's located somewhere in that location. You might find one on eGay.

This might not b srs...

[R6n350GT]

ticking noise is normal... if you worried get a long flat blade screw driver or something metal wit plastic end and put the metal end on each cylinder and you ear on the plastic end.

Listen for any cylinder that sounds different to the rest, if all the same then ticking is normal. Unless ur lifters are acting up, if so get some cleaner and run it though but honestly the best thing for it is to every now and again redline 2-4 gears few times once car is warm and you are driving.. if you drive like a grandpa, its actually worse for the engine believe it or not...

as for my font colour its just standard?

Edit: Oh the name of the part is a upper Plenum, and the part of the plenum your pointing to is the throttle body... FYI

Edited July 3, 2012 by R6n350GT

[iamhe77]

NISMO-61, where are you situated?

May I recommend catching up with another member that has a fair idea about V35's and learn from them/ask questions.

Even better would be to download the G35 workshop manual and start reading. The more you learn, the more you can do and dare I say, the more money you will save.

[PN-Mad]

Location melbourne. Know anyone round that way?

[hughezy_10]

If there is excessive heat coming from that area it might be the calipers. I have a similar problem with mine and I have just been told my calipers need overhauled.

[NISMO-61]

that ticking noise does affect the car and its performance at all, but if you have no idea about what it is, kind of annoying.

I have been fooling around melbourne to find someone who can tell me something about that bloody noise coming from the rear end of the car. It seems like 80% rear wheel bearings are playing up. If I need to change them, where can I find them?

350's or Maxima's rear wheel bearings would suit my 300Gt V35 Sedan or not?

Any idea?

Thanks in advance.

[iamhe77]

Are you interested in working on your car yourself or do you intend paying others to service/modify?

Two options I can think of in Melbourne are "Scotty NM35" although he is more along the lines of building/installing modifications or you could have a look at this thread: http://www.skylinesaustralia.com/forums/topic/403845-servicing-in-melbourne/

[NISMO-61]

If I can figure out the problem, I reckon I can do it, but it's hard to identify what the issue is. Therefore I need someone who can do it and tell me the exact issue.

Thanks for your help.

Just wanna repeat the question I asked earlier on, the rear wheel bearings of V35 compatible with 350s or Maximas? any idea?