After the "full air treatment" I noticed that my td6 developed a higher induction noise. Actually, a MUCH higher induction noise, especially when cold and under full throttle.
Suspecting that the performance filter was the culprit, I installed a "normal" Bosch one and that improved things, at least in the lower frequencies.

Unfortunately the noise is still there: it's like a constant hum (reminds me of a cow), which is worse when cold, when under full throttle and under 2000rpm. When on full throttle, at any rpm, it seems that the engine is inside the cabin!

This noise comes with a high frequency vibration that can be felt through the steering wheel and cabin floor.

All of the above happen with transmission in D. When in neutral nothing of the above happen, even when revving the engine with full throttle like an idiot.

I know that a td6 is very tractor-like, but mine didn't sound like that when I bought it in October. Roberto
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2002 L322 TD6 HSE in Ipanema Sand with "suicide charcoal" interior.
Other current cars: 1990 MB R129 300SL-24, BMW 118d E87.
Previous cars: '87 Mitsubishi Pajero, '96 Lancia Dedra SW, '91 Lancia Delta Integrale EVO, '01 MB CLK 200k EVO, '03 MB R230 SL 500, '99 Range Rover P38 4,6 HSE.

A noise like that is usually caused by something in the wrong place, the engine is isolated from the body of the car to prevent vibration, if some part of the engine is touching the body then it could cause your problems...

Could also be a failed engine or gearbox mounting, I'd also get the drive shafts and prop shafts checked for worn joints as these can cause vibration if worn....

There are lots of things that that could cause it but they are the easy ones to rule out.... Pete

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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I think that the engine mountings are out of the equation: if they were failed, I should experience noises and vibrations even in neutral, right? As I stated, when in N the engine is noticeably quieter and no vibrations are transmitted through steering wheel or cabin floor.

Therefore, there must be something going on in the transmission compartment.

Car's going to the specialist indie tomorrow for the Italian equivalent of MOT, let's see what they find. Roberto
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2002 L322 TD6 HSE in Ipanema Sand with "suicide charcoal" interior.
Other current cars: 1990 MB R129 300SL-24, BMW 118d E87.
Previous cars: '87 Mitsubishi Pajero, '96 Lancia Dedra SW, '91 Lancia Delta Integrale EVO, '01 MB CLK 200k EVO, '03 MB R230 SL 500, '99 Range Rover P38 4,6 HSE.

When put in drive there is a torque effect on the engine and box, if the mounts have failed there is the chance that the small movement in the engine could make it touch somewhere and create the noise...

Hopefully the garage can give it the once over and find the problem...

Good luck with it.. Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Hmmm... interesting...

After lunch I opened the bonnet in order to check oil level, and noticed that the sound deadening panel fitted under the windscreen (over the engine) has fallen: more precisely, the inner part of it is loose, while the outer one is still properly fixed with its two screws. Also, the inner part touches the end of the engine and shows clear signs of abrasion.

I'll figure out a way to fix it and see what happens before giving the car to the garage. Roberto
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2002 L322 TD6 HSE in Ipanema Sand with "suicide charcoal" interior.
Other current cars: 1990 MB R129 300SL-24, BMW 118d E87.
Previous cars: '87 Mitsubishi Pajero, '96 Lancia Dedra SW, '91 Lancia Delta Integrale EVO, '01 MB CLK 200k EVO, '03 MB R230 SL 500, '99 Range Rover P38 4,6 HSE.

Alright, I spent some time under the bonnet. Put the insulating panel back in plae and checked that nothing is out of place. Still, I get mid-high frequency vibrations through steering wheels, pedal and transmission.

Before I send the car to the shop (I want them to check the vacuum pipes that operate the engine mounts) does anyone have the part numbers of engine hydraulic mounts and transmission mounts? Roberto
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2002 L322 TD6 HSE in Ipanema Sand with "suicide charcoal" interior.
Other current cars: 1990 MB R129 300SL-24, BMW 118d E87.
Previous cars: '87 Mitsubishi Pajero, '96 Lancia Dedra SW, '91 Lancia Delta Integrale EVO, '01 MB CLK 200k EVO, '03 MB R230 SL 500, '99 Range Rover P38 4,6 HSE.

you can get the part numbers from the russian online microcat, http://lrparts.ru/engl/ ... - .- -.




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Thanks Stan

Didn' think it was still working... based on my experience with MB, all of the russian catalogs get cloed on a daily basis...

I just want to get the OE manufacturer of those components... it's quite easy to get them at a very cheaper price here. Roberto
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2002 L322 TD6 HSE in Ipanema Sand with "suicide charcoal" interior.
Other current cars: 1990 MB R129 300SL-24, BMW 118d E87.
Previous cars: '87 Mitsubishi Pajero, '96 Lancia Dedra SW, '91 Lancia Delta Integrale EVO, '01 MB CLK 200k EVO, '03 MB R230 SL 500, '99 Range Rover P38 4,6 HSE.