Weird car vibration at 1700-1800 RPM

Hi everyone!

So my girlfriend bought a used car, a Hyundai i20 2011. 1.4l 55kW diesel motor. She bought it with a guy who is a mechanic, so I was expecting the car to be OK. Once I got to try the car out, I was unpleasantly suprised. So this issue is pretty hard to explain, but I’ll try my best to do that.

So while the car is in neutral, 1st gear or 2nd gear, everything is fine. Also while switching gears at high RPM (above 2000) everything is fine in the 3rd and 4th and 5th gear as well. The strange behavior is hard to explain, but here it goes:

For example, let’s say I’m in the second gear, switch to the 3rd gear, and the RPM is now at 1400-1500. Now when I press the gas and accelerate there is no vibration, but as the RPM goes up, I’ll get a 1-2 second aggressive vibration (can feel even the dashboard vibrating) when I’m at 1700-1800 RPM. As I continue pressing the gas and RPM keeps going above 1800-1900 the vibration is not there anymore. The same thing applies to switching from 3rd to 4th and from 4th to 5th.

Basically it happens every time at 1700-1800 RPM when I try to accelerate somewhat fast.

However this issue is NOT there when I accelerate slowly.

What I think it’s not:

  1. I know that cars with manual gear shifting vibrate while accelerating at low RPM (1100-1400). But this is not the issue. This car also vibrates mildly while accelerating at low RPM, but that is not the same kind of vibration that I’m talking about. The vibration that this post is about is more aggressive and shorter.

  2. I don’t think it’s unbalanced tires or something similar, because, as I mentioned, the car does not vibrate if I switch gears at high RPM. This leads me to think that this might be something related to the engine or something like that.

One mechanic said it might be the engine air filters, so he changed them, but the issue didn’t go away.

I’m now thinking of taking the car to a more qualified car repair shop, but I want to be able to give them any extra info and possible hints, because I really want this fixed.

What could cause a problem like this?

Find out if the vehicle is equipped with a dual mass flywheel.

If it is, that might be where the vibration is coming from.

https://www.phoenixfriction.com/t-symptoms-of-dual-mass-flywheel-failure.aspx

Tester

1 Like

All you want to do is say what you are experiencing while driving. It is up to the mechanic tp determine the problem . If you suggest something that does not work they do not have to stand behind the work.

2 Likes

+1
If you say, " I think that you should replace the xxxxxxxx", and that suggestion is unsuccessful, you will pay for that unsuccessful repair attempt. On the other hand, if you go to a competent and honest mechanic (obviously, NOT a chain-run operation or a tire shop) and describe the symptoms, the shop will diagnose the problem, and they will be on the hook for any unsuccessful repair attempts.

1 Like

Yeah, well, this issue is hard to explain and can be misunderstood at many points. That’s why I want to give them an association with something which could help them not misunderstand the issue that I’m experiencing.

They will drive the vehicle and that is how they will narrow down where to look . That is their job. Also , this is not your vehicle so the owner is the one who should decide how bad they want to pursue a repair.

I can guarantee that if you suggested that someone on the internet says it is the clutch or Flux Capacitor you will annoy the mechanic.

Sounds to me like you’re shifting to soon.

Yes, it is very possible that the OP is lugging the engine.

Nope the car actually shows when to shift. Even shifting after that still causes the aggressive vibration. The vibration you’re talking about is the one that occurs at 1100-1400 RPM which is normal.

Some vehicles have quirks like noticeable vibrations.

The vehicle is 8 years old, replacing the engine mounts may resolve the disturbance/discomfort of this engine vibration.

1700 RPMs is considered mid range for a diesel engine.

Hey Mate, did you ever find out what the issue was here. I have the exact same issue on my Hyundai Tuscon. Everything you said on your post is the exact same as what I am experiencing.