Got the car not too long ago. Just started having or just noticed a noise from the rear side.

when in gear, slowing to near stop (just before disengaging to neutral or say first gear up to 2k rpm or so), there's a slight metal on metal noise. If one of following; windows up, music on, or rpm higher than 2k, can't hear it. clutch doesnt slip, car is stock, no burnt clutch smell. Correlated with clutch some how because when the clutch pedal is depressed, noise goes away. TIA

 

Is it a high pitch noise that goes away when you depress the clutch? is it only when the car is warm?

 

I guess you could call it high pitched, sounds like grinding of metal to me. sort of like rusty bearings.

When the car's in neutral, there's no noise, only when the car is in gear at low speed. I think that rules out the PS pump.

haven't heard it when the car's cold but wasn't exactly listening for it either, will try in the morning. Both times i've heard it the car was already working temps.

thanks

 

Could be the throwout bearing assembly, does it vibrate or feel wierd at all in the driveline?

 

Drivetrain doesn't vibrate. The clutch feels fine. Get some rolling marbles noises from the tranny at neutral and under hard throttle but gather that's normal.

warmed car up this morn for about 5mins, the noise is there between 900 and 2000 rpm. any higher than 2000 rpm and the engine noise gets louder than the described noise. This time, i noticed the noise will come on and off, (while clutch still engaged) when the rpm drops to 900 but scenerio is inconsistant. My guess is the correlation is with loading rather than rpm.

the noise is like taking a grinder to steel but at much lower decibels. or the noise when the brake pads wear thin and some pads have that warning function, rotating scraping sound, only much less audible.

 

Could it possibly be a belt tensioner bearing going up? I just had this happen. Check the pulley right below the PS pump.

Since you mentioned the brakes I am assuming you have checked for pad wear. Did you check for wheel bearing wear?

 

Check the Crank pulley also, make sure its not loose or the bolt's not loose and that its not coming off.

 

check this link

 

I noticed something similar on my TT. I noticed it at low speed when I was "lugging" it. To me it sound like gear noise from the trany under load. Mine doesn't sound high pitch but does sound like gear/bearing noise. It is very "on" or "off". It goes away instantly. My car has very low miles and has done this from day one. I have never had it checked. I probably should.

 

My 03 Turbo -- since I got it with 9500 miles on it this June and it has over 18Kmiles on it now -- does something similar.

When warmed up and slowing down for a stop or prior to making a turn -- city driving nothing hot and heavy -- with transmission (6-speed) in gear -- 3rd or 4th -- under engine braking I hear what sounds like a faint brake squeal (though not quite as high pitched). However, I'm not applying the brakes.

The noise goes away the second I depress the clutch.

I notice no other oddities and clutch feels fine and doesn't appear to in any distress. Car was pristine and not bused or misused so I don't think clutch is going bad.

Have not yet had time to have local Porsche mech. give a listen or even ask him about it.

No fluid leaks and no other symptoms or odd behavior. Well, I do notice when car fully up to temperature when I stop at light for instance and after I've shifted transmission into neutral and with the clutch pedal fully released and my foot of course resting on the carpet mat and not the pedal, there's a rattle from the rear of the car. This I know is the clutch disc rattling on the input shaft. I've heard this before with other cars. I can make this noise stop by the same action as I described above: depress fully the release the clutch pedal. Noise goes away and does not come back until the next time (maybe) I again roll up to a stop and slip tranny into neutral.

Car has 2 year (to 2011) and 100K mile CPO warranty so I'm not sweating it.

Sincerely,

Macster.

 

thanks for everyone's inputs

my car feels normal as well, bone stock, 16k miles, serviced at dealer, Im the second owner. If the windows were up, I wouldnt hear the noise. That's how quite it is.

checked the brake pads just in case, still 1/2 inch left. visually checked both the crank pully and tensioner, car on, no play, and checked the bolts, not loose.

Read through the PS link. my guess is it's not the PS, because the noise doesn't get louder with RPM as described in that link,. it's constant and can only be heard between 900-2000rpm. Unless this is only the begining...

Could it be the clutch bearing as Nero suggested?

 

Classic clutch/ power steering reservoir valve.... Chuck Jones can tell you how he wasn't worried since he too had a cpo: Unfortunately found out it was NOT covered.

Needs to be fixed- it can fail suddently and pentosin is flammable.

 

Thanks. I'll have tech take a look/listen Monday. Car came with "new" and "improved" CPO warranty which supposedly covers everything like factory warranty.

We'll see if this noise turns out to be something.

Sincerely,

Macster.

 

Unlikely to be clutch throwout or release bearing related if noise *not* present when clutch pedal *not* depressed.

Had the throwout bearing go out on another car (after 120K+ miles) and believe you me if your car's clutch release/throwout bearing bad or gone on your car you'd know it.

Did not read this in your posts -- may have overlooked it -- but if you can make noise go away or appear with depressing/releasing the clutch pedal though, then this does strongly suggest the clutch bearing or possibly input shaft bearing of transmission.

Sincerely,

Macster.

 

noise is *not* present when:
a) clutch pedal *IS* depressed & tranny is in gear/in neutral
b) when pedal is released & tranny is in neutral.
c) when RPM above 2000rpm and/or at higher speeds. I suspect noise is still there, yet unheard due to louder ambient noises.

The noise can not be replicated soley by releasing/depressing the clutch pedal. The car must be in gear and moving.

Noise is there at a constant pitch and volume regardless of cold/warm/hot car.

Drove back and forth on a quiet road tonight, right next to the concrete divider as to resonate and amplify the sound. Was able to replicate the noise in 1st though 3rd between idle rpm of 900 up through 2000rpm. Any gear, speed, or rpm over that, and engine/tire noise becomes louder than the noise.

If one were standing in an underground parking lot and I coasted past, in 1st/2nd gear under 2krpm, you'd hear it. If you were in your car, windows up, engine off, parked and I rolled past under same circumstances, you'd probably not notice it.

I'm fairly certain it's not normal and the start/sign of worse to come. The noise can best be described as a vacuum, hair dryer, power saw, squeeking brakes ... only at much lower decibels but clearly from the rear end of car.

Would a worn, near to the metal clutch plate make noise like this? Or is it the 2 clutch bearings suggested...

Thanks everyone, and macster, hope you get that sorted under the CPO.