weird noises in 04 Z - squeak + rattle

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karlheinz - 20 Sep 2004 19:35 GMT

Hey,

I am experiencing 2 noises in my 04 Z (6 months old, stock touring,
~4500 miles, K&N filter), any suggestions where these might be coming
from would be extremely appreciated:

1) squeak/chip/whistle when accelerating
When I hit the gas harder (i.e. depress the pedal about 2 inches or
so), or when shifting up and hitting the gas at the same time, I hear
a squeak-like sound somewhere in the left front, possibly linked to
the gas pedal itself. I noticed this sound about 1-2 weeks ago. Sound
does not happen when speeding up gradually and/or shifting down.

2) rattle/marble/metallic sound in idle and first gear
I noticed this months ago. Trying to reproduce at the dealership of
course failed - sound didnt happen.

Car has to be warmed up (i.e driven for like 30-45 minutes).

Sound happens in first gear (e.g. going uphill - driveway, slanted
parking lot- as well as on level surface). Might sound like 'marbles',
metallic / rough metallic.

Also happens when car is in idle and running, hovering at around
750-1500-2000rpm. When I turn it off in idle, sounds like shatter/spin
down. This sound goes AWAY when I depress the clutch pedal.

2nd sound does NOT happen at all (neither 1st gear or idle) when car
is cold. I.e. this morning I didnt hear it at all.

Any ideas?

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Jon Smith - 21 Sep 2004 01:08 GMT

On the whistle sound you should check the intake to nake sur ethe intake
is properly sealing around the K&N filter. YOu can develop a noise
there if the filter is not seated properly.

On the other noise it is probably the dual mass flywheel. The dual mass
flywheel is to keep you from trashing the transmission and it does
rattle when at idle and at some unloaded speeds as the friction surface
of the flywheel is on a bearing that can rotate on the flywheel and
bounce against the rubber stops.

> Hey,
>
[quoted text clipped - 27 lines]
>
> Any ideas?

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karlheinz - 21 Sep 2004 15:51 GMT

> On the whistle sound you should check the intake to nake sur ethe intake
> is properly sealing around the K&N filter. YOu can develop a noise
> there if the filter is not seated properly.

Checked and reseated the air filter, made sure its all closed up.
Noise is still happening.

> On the other noise it is probably the dual mass flywheel. The dual mass
> flywheel is to keep you from trashing the transmission and it does
> rattle when at idle and at some unloaded speeds as the friction surface
> of the flywheel is on a bearing that can rotate on the flywheel and
> bounce against the rubber stops.

So I assume that this is normal and every 350Z owner is experiencing
the same noise in idle + 1st gear?

thanks!

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350guy - 01 Oct 2004 21:45 GMT

I am experiencing the same noise coming from the front left and my car is
stock under the hood, no mods. It seems to be heaviest in 1st and 2nd -
then simmers down a bit - I am also hearing the very loud rattel while
idling and have had the dealer look at it under warranty - they determined
the noise to be normal at this time and offered no other information or
explanation. I am now recently hearing a very loud clicking sound from the
real axle area when the clutch is depressed just as i am releasing it - as
the car goes into gear this sound is very loud and seems to be getting
worse almost - it is newly noticed and have not had it examined yet -
are you also experienceing a lerge amount of rattel in the cabin intereior
- i am in the rear view mirror, the dash - and now my door panel -

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Gary Coffman - 02 Oct 2004 06:18 GMT

>I am experiencing the same noise coming from the front left and my car is
>stock under the hood, no mods. It seems to be heaviest in 1st and 2nd -
[quoted text clipped - 7 lines]
>are you also experienceing a lerge amount of rattel in the cabin intereior
>- i am in the rear view mirror, the dash - and now my door panel -

So, you bought a car that was built on a Monday. :-)

Whistling under the hood is almost always an air leak.
Could be any of a number of places. Spraying suspected
areas with WD40 should cause a temporary change in
engine sound at idle when you find the right spot. Then
tighten, repair, or replace the offending item.

The drive train rattle at idle or under light acceleration or
deceleration is the dual mass flywheel, and is normal.

The rear end clicking is a problem with the rear axles
working loose. There's a TSB out on it. Take it to the
dealer and they'll tighten them up, or if the splines are
damaged, they'll replace the axles and/or yokes.

The mirror rattle is a common complaint. A dab of RTV
between the glass and the housing will stop it.

The passenger side dash noise is also a common complaint.
This noise often comes and goes with changing temperature.
A squirt of silicone spray at the base of the windshield usually
stops it (for a while anyway).

A door rattle is usually something loose in the window mechanism,
gotta open it up and fix that. It *could* be a broken or loose door
clip, though. Check all around the inner panel of the door and make
sure nothing is loose first before diving into the door.

Gary

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