You do know it's a Diesel right?

 

it is not the diesel rumble, it is some kind of accessory noise

 

Is it is your dash some where?
It is the flapper or what not, working to keep the temps working constant for you

 

It is normal on the V10...

 

It's not a funny rumble at the light, it's a scary rumble in the night...

What did you think 750Nm was going to sound like...?

 

I assume it's normal. I didn't believe it either until I drove a couple other V10s. Same vibration at idle.

 

I own a 2007 V10 and formally owned a 2004 V10...I'm not sure what rumble you are speaking of as I don't/haven't noticed such. Can you be more specific when you hear this....windows open, air suspension on normal or high...the only noise I get is if the air suspension is adjusting back up and my foot is on the brake pedal - the suspension geometry changes and you will get a creak or two in the brakes as tension in the suspension is released at the new ride hight. Remember the V10 (all air suspension Touaregs) are continuously adjusting ride hight based on speed so when you come to a stop the vehicle is usually rising up a bit to the normal rest ride hight...

 

My V10 is at the local dealership right now, they said that they have no clue where this stop light rumble is coming from, because it is audible everywhere under the hood. So far I have to go back tomorrow to pickup my loaner car... I hope this is not another case of garage dwelling V10 I bought

 

I have the same stop light rumble Mish Mish, it goes away as soon as you take your foot off the brake. I got it checked from two different dealerships and both confirmed all was normal....let me know if you hear otherwise.

 

My new-to-me 2004 V10TDI does the same thing. It's a little disconcerting -- sounds like torque converter chatter or something. I hear it a bit and feel it in the floorboard a little bit. It goes away as soon as I'm off the brake or in neutral. I'm choosing not to worry about it, but please report back with your diagnosis.

Cheers, John

 

not sure if it is the same thing, but if it is a slightly more pronounced dieseling, it is normal and is caused by the torque of the engine, at idle, wanting to move forward but brake restrained and slightly lower when in gear. Almost like the RPMs are too low when in gear (but normal). If it is this, you should find it even more pronounced if you "slightly" depress the throttle while continuing to keep the brakes applied but prior to the RPMs raising too much. Once you raise the RPMs into the high end of idle or above the idle range, the dieseling goes away.

Do you how many RPMs you are turning when this happens?

 

Do you how many RPMs you are turning when this happens?

In my case and most others I have read about, it occurs at idle RPMs -- say 500-600. It's most noticeable at a stop-light, where you're in gear with your foot on the brake and stopped. If you let the car roll, or slip the transmission into neutral, the chatter/rumble/vibration stops.

Cheers, John

 

So, if I hear you correctly, this noise is detonation, that would go away if RPM is raised, or decreased. Therefore, I would suggest dropping idle RPM say by 50 RPM, which should get engine out of the noisy range. I also noticed that if I turn off climate control (A/C), while sitting at the light, this noise goes down as well.

 

interesting. sounds load related. raising the RPMs, again if it is the same thing that you are hearing. I believe that it is widely accepted that the V10 design requires a higher cetane level then what is normally available in the states, as do the other VW diesel engines. Adding powerservice or some other additive with a cetane increaser may resolve this issue.

 

Well, just spoke to the dealership and they said that she is still stuck there. They found heat damaged harness that goes into the valve body (again, this is from the words of their service adviser, do not quote me on this), so they are replacing that harness to see if this fixed this cold jerking issue and possibly the rumble in her tummy at the dead stop. If not, they are looking at a new transmission, since that rumble is coming from the bell housing area. One way, or the other, I will not argue with new transmission, while driving dreamy Toyota Yaris for another week. I was gonna enjoy driving my V10 this weekend, since it is the essence of my $32K investment, however it will only get sweeter, the more I drive 1.5L Yaris, AKA - the mighty pinnacle of Japanese engineering.

 

I've had the a rumble in my '06 V10 since new. I noticed if you release the brake pressure slightly the sound diminishes. THinking it is the vacuum brake booster. Knowing Diesels don't have the vacuum to support the power brakes, they normal have some kind of vacuum pump to provide the vacuum for the brake booster. Stopped at the light, you are at idle, and have the brake down hard, the pump needs to pump hard to support the vacuum required for the power brakes. It's my theory, but seems to match experience.

 

Well, if this "normal" that why are they holding my car Maybe I will get her back soon.

P.S. if only Yaris had power locks, I'd keep it for good!

 

Are the brakes in these things really vacuum-assist? I just assumed they'd be hydraulic/fluid-driven, something like the Ford hydroboost system. I freely admit I have no knowledge either way.

Cheers, John

 

I know that steering is electric powered, but brakes are probably air boosted.

 

Its the 750nm fighting to go! The rumble is from the transmission according to the Service Manager I spoke to, because as he said, the car has an engine bigger than a truck! I used to have the rumble, but then it disappeared after the last periodic service.

 

I don't know if it would help or not but my early 2004 came factory set with the transmission in "hill hold" mode which means at stop it basically shifts into 2nd gear which somehow locks the tranny and it will not roll backwards. In later years 2005+ VW decided this feature would be deactivated in US models so if you want it you need a Vag-Com and go to Transmission and recode to Other World from US. Perhaps if the tranny is shifting into 2nd the load is removed and thus the reason I have not had this rumble in either 2004 or 2007 V10...worth a shot for those that have Vag-com and the rumble.

 

Are you saying you turned on hill dissent/ascent option and rumble went away? Because I can ask my dealer to turn it on, I am sure they will be more than happy to do it for me and get this rumbling monkey off their back!?

 

How many v10s has your dealer serviced? Sound may be new to them, too (i.e., they may not know what normal is).

 

Exactly, they never heard this sound and were completely thrown off by the situation. They mentioned that it comes from everywhere and that they could not pinpoint exact source.
Do you also have this sound?
I noticed today that when I just start the car, especially when it is cold, there is not rumble, it only appears after some warm up, even a little.
I know that this is a bit scary rumble, plus some vibration, however since we have almost every V10 member here with it, since the day one, I am calming myself down.

Also, I see not brake booster under the hood, so maybe brake is hydraulic, causing this noise at a stop?
I also can not find starter and alternator on V10, where are they??? Are they inside the bellhousing, on flywheel, like with hybrid cars?

 

It's not the brake booster, because at least on mine, you can be at a stop and on the brakes with the shifter in neutral or park and not have the vibration.

I believe I've heard that the alternator -- and possibly all accessories? -- are on the back side of the V10 rather than hanging off the front like most other engines. I haven't bothered opening up all the plastic covering to look.

Cheers, John

 

I had a chatter on my 2.5TDI at idle, my local dealer noticed it and investigated the problem, it was a bearing in the alternater which they replaced (The whole alternater that is) under warantee Around £1100 pounds ($2200 dollars!) its now very quiet at idle.

 

I believe it is the TC as well.
Definitely not an issue either way!

 

If so, trans fluid change should make difference, since new fluid is always slightly (at least) different physically from the used one.

 

Hi there
I have the same problem with my V10 2006 and it is only if you put it in drive and step on the brakes. It sounds like it is a sound in the gearbox like a pump or Torque converter that is under pressure

 

I got another call from dealership, they are installing new harness today and still trying to figure out where this noise is coming from. I will post part number for harness as soon as I get my repair docs.