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TDI Engine Noise

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  • TDI Engine Noise

    I've clocked up just over 1100km in my new MkV 2.0TDI and have noticed that the diesel chatter seems to be louder. It's not that there is any specific noise that has me concerned, it's just the general engine noise. To me it's noticeably louder (not so much that I have to turn the radio up or anything), however I'm sure to anyone else it wouldn't be any different. When I picked it up the dealer said that the noise will get louder and then quieten down as the engine beads. I did take this with a grain of salt.

    So my question is, has anyone else experienced this? Is it normal, or is it just my mind think playing tricks, or has it just been a long week and I'm in desperate need of the long weekend!

  • #2
    I have heard of TDIs getting slightly louder as they get run in (and freer revving), but usually around 10,000Km or more. Some people say they also seem smoother too.

    Is it more noticeable at idle, or when you are near a wall or another vehicle ? My 2.5 TDI (18,000Km) is distinctly louder when someone pulls up next to me at the lights, obviously the noise reflects off their vehicle back to me.
    2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).

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    • #3
      TDI clatter

      I found that the clatter did increase slightly after initial running (can't remember the kms) but it seemed to quieten after about 12,000km. You have to remember that PD motors are noisier than CRI motors so don't compare it with say a Peugeot or Citroen. You'll also notice that after you slow down when entering a low speed limit zone and have a slightly open throttle the clatter seems louder. This is normal with PD motors. Really, you have nothing to worry about.

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      • #4
        Man I thought it was just me! I'm at 800km's, and I was just thinking the other day that the rattle sounded a bit louder overall. I kinda like it, for I didn't buy a diesel for the sonorous engine note, so you might as well make it obvious!
        2014 Skoda Yeti TDI Outdoor 4x4 | Audi Q3 CFGC repower | Darkside tune and Race Cams | Darkside dump pDPF | Wagner Comp IC | Snow Water Meth | Bilstein B6 H&R springs | Rays Homura 2x7 18 x 8" 255 Potenza Sports | Golf R subframe | Superpro sways and bushings | 034 engine mounts | MK6 GTI brakes |

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        • #5
          Originally posted by cetane View Post
          I found that the clatter did increase slightly after initial running (can't remember the kms) but it seemed to quieten after about 12,000km. You have to remember that PD motors are noisier than CRI motors so don't compare it with say a Peugeot or Citroen. You'll also notice that after you slow down when entering a low speed limit zone and have a slightly open throttle the clatter seems louder. This is normal with PD motors. Really, you have nothing to worry about.
          for those who dont know, cr = common rail = more otto like characteristics
          PD = Pump duse = direct injection = more truck like characteristics

          ***hey mate.... common rail injected TDi's are still direct injection.

          TDi = Turbocharged Direct injection.... just FYI - mod***
          Last edited by gldgti; 07-03-2008, 09:22 PM. Reason: furthering education....
          2x Caddy, 1x Ducato

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          • #6
            As I've been reading, the noise relates to diesel combustion. It can be reduced by pilot injection, EGR, and higher cetane fuels (eg biodiesel).

            See:

            which also has a broken link to a fascinating engineering lecture:


            I presume common rail permits decoupling of fuel pressure from engine position but that is is still possible engineers will get rid of the noise from unit injector systems in time as they can achieve higher pressure.
            Last edited by bluey; 01-10-2008, 06:45 AM. Reason: clarification
            2015 Polo Comfortline 6M + Driving Comfort Package
            2011/11 Yeti 103 TDI 6M + Columbus media centre/satnav
            (2008 MY09 Polo 9N3 TDI retired hurt hail damage)

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            • #7
              According to VW, in the Polo brochure, TDI = Turbo Diesel Injection.
              2008 Volkswagen Polo 1.9 TDI

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              • #8
                Interesting that higher cetane fuels should be quieter. Australian diesel fuel legislation specifies minimum cetane 46. Polo glossy brochure says Diesel 49CN. Golf glossy says Diesel 51CZ (which I presume should be CN).

                This Premium diesel is B20. http://www.farmersfuel.com.au/Archiv...m%20Diesel.htm

                BP Ultimate diesel is the only diesel BP makes with a minimum cetane rating of 50 and you can only get it in Perth!

                How do you get slightly higher cetane diesel here to meet VW requirements?
                2015 Polo Comfortline 6M + Driving Comfort Package
                2011/11 Yeti 103 TDI 6M + Columbus media centre/satnav
                (2008 MY09 Polo 9N3 TDI retired hurt hail damage)

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                • #9
                  [deleted duplicate]
                  Last edited by bluey; 19-10-2008, 06:31 AM. Reason: delete duplicate
                  2015 Polo Comfortline 6M + Driving Comfort Package
                  2011/11 Yeti 103 TDI 6M + Columbus media centre/satnav
                  (2008 MY09 Polo 9N3 TDI retired hurt hail damage)

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                  • #10
                    Buy a jerry & fill with B100. add 2l+ to tank everytime you fill with dino diesel ... ??
                    MY08 2.0L TDI DSG

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                    • #11
                      bugger it, when is Vic going to get premium diesel
                      VW: it aint just a car, its a way of life
                      There are few things more satisfying in life than finding a solution to a problem and implementing it
                      My Blog: tinkererstales.blogspot.com.au

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                      • #12
                        Victorians can get ecofuels, which should have higher cetane since biodiesel has a higher cetane - see:
                        Hey there fellow wanderers, Can anyone point me in the direction of Biodielsel in Melbourne. I have just moved from WA where it is available virtually on every corner. Want to keep doing my bit to keep the polar bears....


                        On my second tank of diesel wondering if random variability in cetane rating is the cause for variability of diesel clatter. Polo seemed quieter at cruising speeds and the computer thinks it's using less fuel at idle (0.8L/hr vs 0.9L/hr previously). or maybe its my imagination.....
                        2015 Polo Comfortline 6M + Driving Comfort Package
                        2011/11 Yeti 103 TDI 6M + Columbus media centre/satnav
                        (2008 MY09 Polo 9N3 TDI retired hurt hail damage)

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