strange noise on throttle lift off

[Chan_P1_TDi_FR]

firstly, I have a TDi FR.
just want to check with people it this is normal as i have just noticed.

After the car has been started for a minute. dab the throttle then lift off. rev to about 1500-2000 rpm. as the rev's drop i hear a whirring noise. it's not the same noise as the turbo whine. it's a slight deeper whirl noise.

not sure what it is. initially thought it was clutch and pray to god it's not the clutch, but i can't see it being a clutch problem as i don't need to touch clutch pedal for noise to be heard.

if other people have the same noise then, it sould be normal. considering taking it to the garage to get it checked out. but wanted to check here first

 

[mds1256]

i have some thing similar but my car never used to do it, basically when im driving in 2nd and the revs are about 1700-2000 i can hear like an air noise, its very similar to a grating noise and i am woried about it also, it has been in to dealers for it but they cannot hear it

 

[seremotors]

glad its not my imagination lol I get a 'growling' noise from my FR from time to time but there are so many odd engine noises Im not that worried. Fingers crossed anyway . . .

 

[Billy_123]

Not sure if its any help.

On my TDI FR in 2nd or 3rd at low revs when i then press the accelerator it sounds as though the turbo is gargling / grating sometimes. It doesn’t make any difference if I accelerate slowly or hard. On the plus side it doesn’t seem effect performance.

The problem is I know it going to be really hard to reproduce as it only happens once about every 2 weeks, but it will do it for the whole journey when it does do it. The reset of the time it’s normal.

I am going to mention it on my first service, which is going to be very soon and will see what they say.

 

[seremotors]

any chance all this is linked somehow to the DPF regenerating itself

 

[mds1256]

mine is like a grating noise on the turbo also... and yes it seems to get slightly more noticable when its regenerating

the easiest way i can get it to replicate the noise it to lift the bonnet, rev to about 2,500 rpm and quickley switch the engine off and its the noise of the turbo spinning down, that sounds very similar.

mine has had a new turbo on tho and it only seems to have been noticable since that has been fitted. new turbo was fitted as it was throwing a fault up saying it was over boosting, was wrong tho as eventually a new temp sensor fixed my problem so i got a new turbo out of it and now it makes the noise described above

 

[seremotors]

hmmm is that a good idea shutting the turbo down so quickly after a high rev? what with the DPF, plastic manifolds etc I havent really let noises bother me that much.

 

[mds1256]

2500 isnt high, just so it is in slightly

 

[ostafimihai]

Hello everybody,

I also have a Leon FR TDI with 1500 Km and for 3 days I started to hear the same noise when lifting the foot of the gas and pressing the clutch. Revs are between 1000 and 2000.
Could it be the flywheel?

Is it normal? I drove before a Ford Focus TDCi and the engine did not make such noises.

I'll keep you updated if anything new comes

 

[pg_allen]

My car does exactly the same thing, seems to be doing it more with age. I think its cos its finally worn in properly.
Does any of urs do it more when you press hard on the accelerator in low revs and lift off about 2000 - 2500?
It seems to be less when im light on the accelerator. I think its just a sudden shut down of the turbo and release of pressure after heavy throttle.

 

[DIESEL & DUST]

Hi, I have the same issue, however I agree with Seremotors, I think it has something to do with the DPF regeneration. I also find you will have less of that if you use proper Diesel with a higher cetane rating such as Shell V-power, BP Ultimate or Total Excelium diesel.

 

[ostafimihai]

In the begining it was only on full throttle then lift off around 2000 rpm, but now i'm hearing the same noise without lift off the gas or pressing the clutch. Next week on thuesday the whole transmision will be inspected. I suspect thrust bearing and or throw out bearing but I've requested also a change of gearbox oil.
Now I have 4000 km and I don't think is the turbo or DPF because it's a rotational whirring sound. I've also noticed that whan engine is on and in neutral if I press and depress the clutch it makes a loud clank sound and there's no need to press or depress it full.

Next week more news.

 

[cheungy]

This happened to me aswell, the worst experience when it stalled...but was freezing that night but other than it does happen now and again but nothng am too conserned not stalled anymore other than that still running well my tsi

 

[Dawg Primo]

My first 170 TDi Fr made exactly the same noise that you are all describing, over 18mths we managed to clock up 30,000 miles togther without a single hickup or problem.
Honestly belive it is nothing to worry about it is normal.
So much so that I have just collected my new FR TDi and it makes the exactly the same noise !!

 

[ostafimihai]

Does your clutches click if you press and depress them with engine on and in neutral. The click sound comes from the engine so for sure is not the pedal mechanism.

Thanks

 

[JD_SCN]

it's not the front mounted cooling fan is it? I know our 2.0litre renault espace used to make a similar noise to the one described. Kind of like a faint supercharger whine though?...
As said earlier in the post could be anything, all those parts under your bonnet, doing their thing!

 

[laffalot]

My car suffered from the same problem in low revs, circa 1500. It was the N75 valve that was faulty, just had mine replaced for the second time under warranty and the growling noise has dissapeared.

 

[JB]

I have noticed a similar noise when taking foot off the accelerator pedal at low revs or in traffic. I thought i was the exhaust but perhaps not and another "characteristic" of the car!!! I still have very very annoying vibration noises coming from either the parcel shelf or the rear seats grrrrr!!!

 

[ChrisGTL]

My MK1 makes this noise.....I thought it was just when changing gear but it does it when releasing a lot of boost.

Mines defo not DPF as it doesn't have one.....

 

[ostafimihai]

Check this out:

"I have noticed a strange vibration on the clutch pedal when pushed in. Was getting worse when the temperature increased. Also developed some slight grinding noise when shift, especially from start and then from 1st-2nd, 2nd-3rd gears and slight vibratrion on the shifting leverage at around 2k rpm when heavily accelerate. Went to the dealer and was preparing to convince them that there was something wrong with the clutch. I test drove the car just like mine before at the same dealership and it felt much smoother. The mechanic got into the car with me and test drove a few miles. I was expecting to hear 'it was normal', but he said there is probably a problem with the flywheel, or the spring, or the throwout bearing, or maybe the combination of all of them. At the beggining they said it may not be covered because I have 14K mi on my car, but later said it is under powertrain warranty adn they would replace the whole clutch (flywheel, throwout bearing and the spring) and only the clutch disc is not covered, but mine was OK. no need to replace it. It's been 2 weeks since I was at the dealer, the car has not been fixed yet because all parts are in but the flywheel. They can not locate the flywheel anywhere because it seems to be on the national backorder, and there is no flywheels in the US as of right now ( this is what Ive been told). The dealer let me drive the car because it is drivable. I have contacted VW customer service with the request to expedite it because this is a warranty issue and it has already spoiled all my vacation plans. I requested to overnight the wheel from the Germany if they can not locate the part in the US. They opened the case and should call me today.
I suspect this is a very common problem with the MKV cars and VW is well aware of this. The way the dealer agreed to fix everything with no convincing effort from my side and also the fact that there is no flywheels in the US make me believe this is one of the VW "silent recalls". "

I had to delay to put the car in dealer's service to next week. But for sure they will check the clutch components.

Till next week.