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[Solved] Polo 1.4 TDI 2005 AMF 75HP vibration and hum 1400-2000rpm, clutch damper issue?

rowerek0987 12816 16
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What can cause strong vibration and humming in a 2005 VW Polo 1.4 TDI AMF between 1400 and 2000 rpm in all gears, and could the clutch plate damper be responsible?

The thread suggests checking the exhaust flex braid, engine-mount installation, and especially the balance-shaft chain/tensioner, because wear there can throw the balancer shaft out of phase and create strong vibrations in this rpm band [#17328256][#17329981][#17335997][#17336269] One user said the braided exhaust section had a break and replacing it reduced the noise, though the vibration remained [#17335508] Another noted that when replacing the mounts they should be fitted loose first, then the engine rocked slightly forward/backward with half clutch before tightening them [#17335997] A more technical answer pointed out that on these diesels the balance-shaft chain and tensioner are often worn out after about 150–200k km, and replacing them noticeably reduced vibration in a Polo; the suggested repair is usually done together with timing service and can include the shaft seal, oil pan, and oil strainer inspection [#17336269][#17336441] It was also mentioned that the air filter housing/bracket can hit the brake pump and make the bulkhead rattle, so that interference should be checked too [#17336269] The clutch plate damper was not confirmed as the main cause in the thread.
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  • #1 17328153
    rowerek0987
    Level 10  
    Posts: 18
    Help: 1
    Rate: 5
    Hello everyone! This is my first post, so please bear with us. Namely, I have a wv polo 1.4 TDI 2005 before the lifting AMF 75HP engine. The problem is vibration / humming from 1,400 revolutions to 2,000,000 and this happens in every gear. Driving at 90 km / h in fifth gear it is unbearable, this phenomenon occurs both during acceleration and when braking the engine. I replaced all 3 cushions with new ones, absolutely no improvement, new driveshaft, no improvement, oil, filters. There was a lot of play on the differential, so I replaced the gearboxes without any changes. This engine does not have a dual mass flywheel. What do you think it can be because I already lack ideas. Could this be due to the torsional vibration damper on the clutch plate? At idle, in this RPM range, you can also feel trembling, but much weaker with the clutch engaged and disengaged. Please help.
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  • #2 17328256
    berthold61
    Level 28  
    Posts: 1090
    Help: 81
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    I would take a closer look at the braided line from the exhaust manifold, but it's just out of curiosity, connect a kkl interface, it costs PLN 20 and check the condition of the unit injectors that have plus or minus.
  • #3 17328295
    rowerek0987
    Level 10  
    Posts: 18
    Help: 1
    Rate: 5
    Thank you. Diagnostics was carried out at the Bosch workshop and according to them, everything is within the standards. I just checked the braid it looks like it has a break in the middle but is it possible that it vibrates so much? Your 1.4 TDI drives normally at 90 km / h in 5th gear?
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  • #4 17329765
    rowerek0987
    Level 10  
    Posts: 18
    Help: 1
    Rate: 5
    Can anyone help?? These vibrations and humming cannot be heard and cannot be seen outside when driving three at 1600 revolutions, so it vibrates that nothing can be seen on the radio and the steering wheel trembles so scary ? what is it? I will clean the EGR today and check the intake tightness, what do you say?
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    #5 17329809
    coperfild
    Level 35  
    Posts: 2745
    Help: 291
    Rate: 1686
    Did you buy a car with such a defect or something was done on the engine? Make a video with the engine running in this RPM range.
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  • #6 17329971
    rowerek0987
    Level 10  
    Posts: 18
    Help: 1
    Rate: 5
    I tried to make a video but the microphone is not recording this sound. I bought the car with this fault. When shifting into gear, you can hear a "clank" and a jerk of the engine.
  • #7 17329981
    T5
    Admin of Cars group  
    Posts: 12856
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    Replace the braid.
  • #8 17330061
    rowerek0987
    Level 10  
    Posts: 18
    Help: 1
    Rate: 5
    I will replace the braid and let you know if there is any improvement

    Added after 4 [hours] 37 [minutes]:

    https://m.youtube.com/watch?v=Hu2VPgus8VM
    I recorded a video, I better not be able to do it because the phone does not register such bass ?

    Added after 4 [hours] 3 [minutes]:

    https://m.youtube.com/watch?v=gPYcp2_VslY
    Forum members suspect that this is a problem only what is damaged? Could this be a problem with the clutch plate? Maybe the rivet is broken? some miracles happen with this car, I noticed that the engine in neutral turns better when the clutch pedal is pressed, it is more sensitive. And one thing, when I throw a one the first time, it comes in hard and you can hear a knock the second time it's ok, and when I want to stop for the first time, knock a three into it ...

    Added after 12 [hours] 28 [minutes]:

    Anyone suggest something? Please.
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  • #9 17335508
    rowerek0987
    Level 10  
    Posts: 18
    Help: 1
    Rate: 5
    Braid replaced. It is quieter because there was a leak, but the vibrations are still there. I have a question about the pillows, they need to be set up somehow because I put them on, how to say it (full) ? and the right driveshaft has a special task, this tubular because I do not know what to call it correctly, something is inside it or just like that looks like
  • Helpful post
    #10 17335997
    berthold61
    Level 28  
    Posts: 1090
    Help: 81
    Rate: 301
    This thickening is to dampen vibrations, and when you replace the cushions, you leave them loose, you start the engine slightly forward, slightly backward, half clutch and tighten
  • #11 17336017
    invisibleman
    Level 20  
    Posts: 259
    Help: 40
    Rate: 153
    Engine balance shaft positioned?
  • #12 17336031
    rowerek0987
    Level 10  
    Posts: 18
    Help: 1
    Rate: 5
    How is this roller positioned? And where is he located? because it already sounds serious?
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  • #13 17336236
    invisibleman
    Level 20  
    Posts: 259
    Help: 40
    Rate: 153
    You have to dismantle the engine
    Polo 1.4 TDI 2005 AMF 75HP vibration and hum 1400-2000rpm, clutch damper issue?
  • #14 17336269
    sigwa18
    Level 43  
    Posts: 11671
    Help: 1166
    Rate: 3260
    The chain and tensioner (from the post above) after a mileage of about 150-200 thousand km is suitable for scrap. The stretched chain plus the machined tensioner shoes give the effect of an offset balancer shaft, which leads to vibrations. In polo, the exchange was at 170,000 km and after the exchange the vibration decreased significantly. On a 9n polo with a diesel engine, the air housing sometimes hits the brake pump. This is because the filter housing bracket is bent. Especially when reassembling the filter can, it is easy to push the can down and bend the bracket. Then the whole bulkhead wall rumbles until you feel vibration on the pedals.
  • #15 17336288
    rowerek0987
    Level 10  
    Posts: 18
    Help: 1
    Rate: 5
    I have driven 140,000 km, sure as in a bank. And with this brake pump and filter housing I agree 100 percent because it happened. I will give it to the workshop and if it pays off, I will keep it and if some price from space I sell this wonderful vw polo ? I used to have a golf 2 1.6 TD not destructible and what they do now is a shame. I also have a honde accord 7 2.2 I-ctdi recommendable machine ? also let me know what and how with this polo what the mechanic will say thank you guys
  • #16 17336441
    sigwa18
    Level 43  
    Posts: 11671
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    Rate: 3260
    Unfortunately, the cost is around PLN 800-1000. The chain and wheel tensioner set itself is about PLN 400-450. It is worth replacing the chain with the tensioner when replacing the timing (it is removed anyway to have access), plus replacement of the seal in the cover on the shaft and revision of the oil pan and oil strainer.
  • #17 17362438
    rowerek0987
    Level 10  
    Posts: 18
    Help: 1
    Rate: 5
    Unfortunately, I did not solve the problem. the balancing shaft was checked ok, the car was sold. Thanks to everyone for your help
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Topic summary

✨ The discussion revolves around a 2005 VW Polo 1.4 TDI experiencing significant vibrations and humming noises between 1,400 and 2,000 RPM across all gears. The owner has replaced engine mounts, driveshafts, and performed diagnostics without resolving the issue. Suggestions from forum members include checking the braided line from the exhaust manifold, inspecting the clutch plate for a torsional vibration damper issue, and ensuring proper installation of engine mounts. The owner noted a "clank" sound when shifting gears and mentioned that the engine runs smoother when the clutch is pressed. Further insights point to potential problems with the balance shaft, which may require dismantling the engine for inspection. The owner ultimately decided to sell the vehicle after failing to resolve the vibrations.
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FAQ

TL;DR: Many Polo 1.4 TDI AMF vibrations trace to balance‑shaft chain wear (150–200k km). "Stretched chain offsets the balancer and causes vibrations." One owner reported less vibration after replacing the set at 170,000 km. [Elektroda, sigwa18, post #17336269]

Why it matters: This helps Polo 9N AMF owners quickly diagnose 1400–2000 rpm hum and avoid unnecessary parts swaps.

Quick Facts

What causes my Polo 1.4 TDI to hum and vibrate at 1400–2000 rpm?

Worn balancer‑shaft chain and tensioner can misalign the shaft. The stretched chain and worn shoes offset the balancer and induce vibration. One member replaced the set at 170,000 km and felt a clear reduction. "Offset balancer shaft, which leads to vibrations." Start here if you’re near 150–200k km. [Elektroda, sigwa18, post #17336269]

Can the clutch disc torsional damper be the culprit of this humming?

Yes, owners raised the clutch disc damper when shifts clanked and the engine felt different with the pedal pressed. First‑gear engagement felt hard with a knock initially, then normal on the second try. Consider the damper if these shift symptoms accompany the 1,400–2,000 rpm hum. [Elektroda, rowerek0987, post #17330061]

Should I replace a cracked or leaking exhaust flex‑pipe (“braid”)?

Yes. A leaking braid increased noise here. After replacement, the car became quieter, yet the core vibration persisted. Fix the leak to cut noise, then continue diagnosing vibration sources. [Elektroda, rowerek0987, post #17335508]

How do I correctly set the engine mounts to reduce vibration?

Seat the mounts under load before tightening. How‑To:
  1. Leave mount fasteners loose.
  2. Start engine, nudge slightly forward/back, hold half‑clutch.
  3. Tighten all mount fasteners. This aligns mounts and can reduce transferred vibration. [Elektroda, berthold61, post #17335997]

What is the thickened section on the right driveshaft?

That tubular thickening is a vibration damper. It reduces driveline vibrations transmitted to the body. [Elektroda, berthold61, post #17335997]

How can I cheaply check injector balance on the 1.4 TDI?

Use a low‑cost KKL interface to read unit‑injector corrections. It costs about PLN 20 and shows plus/minus deviations. This quick check helps rule in or out fueling imbalance. [Elektroda, berthold61, post #17328256]

Could the air‑filter housing cause pedal vibration?

Yes. A bent filter‑housing bracket can let the canister hit the brake pump, making the bulkhead rumble and pedals vibrate. "The air housing sometimes hits the brake pump." Inspect and re‑seat the bracket before deeper engine work. [Elektroda, sigwa18, post #17336269]

How much does a balancer chain+tensioner service cost, and what else should be done?

Expect roughly PLN 800–1000 for the job. The chain and tensioner set runs about PLN 400–450. Replace the cover’s front seal and inspect the oil pan and strainer during the service. [Elektroda, sigwa18, post #17336441]

Where is the balance shaft, and how hard is inspection on the AMF?

Inspection requires significant disassembly. You must dismantle the engine to access the balancer chain and related hardware. Plan workshop time and tools for this job. [Elektroda, invisibleman, post #17336236]

When did a chain replacement reduce vibrations in this case?

One report noted the replacement at 170,000 km. After the chain and tensioner were replaced, vibration decreased significantly. [Elektroda, sigwa18, post #17336269]

Is 90 km/h in 5th supposed to be smooth on a healthy 1.4 TDI?

If you have this issue, some report it as unbearable at 90 km/h in fifth. In this thread, the owner also found a broken flex‑pipe braid. [Elektroda, rowerek0987, post #17328295]

What if I ignore chain/tensioner wear and misalignment?

The balancer remains offset, which directly sustains the vibration. You will continue feeling the hum within the problematic rpm range. [Elektroda, sigwa18, post #17336269]

Was the vibration problem ultimately solved in this thread?

No. The balancing shaft was checked and reported OK, but the car was sold with the issue unresolved here. [Elektroda, rowerek0987, post #17362438]
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