It sounds like something is loose, rather than rhythmically vibrating at engine revs. Of course it’s impossible to say from the video, but I would look at the heat shield first.

 

I would suspect the exhaust that no longer has the shock absorbers and somewhere the trepidation is transmitted to the body. But, as our colleague says, the diagnosis cannot be conclusive just by watching a video.

 

I would bet on that being a loose exhaust heat shield.

 

Cylinder ignition failure - diagnosis - you'll get lots of advice.

Diagnosis and maintenance are better.

 

Ausfall der Zündung eines Zylinders – Diagnose – du bekommst jede Menge Ratschläge.



Besser ist eine Diagnose und eine Wartung.

In English JardaB, you've been here long enough to know English is the required language.

 

Sorry, I contribute to the three Suzuki forums, Czech, German and English and the error slips in.

For me personally there is no problem to translate a foreign language on the website.

 

LOL….’contribute’ to 3 Suzuki forums, and advise the poster here that this rattle might be ‘cylinder ignition failure’. Seriously???

 

Why not? One cylinder does not ignite a temporarily lean mixture when you step on the gas. I can hear the engine misfiring (tarot card game) on three cylinders. There could be 10 other causes, as others have suggested.
** Just as - what about the dual-mass flywheel clutch (If fitted)?
** ?? rattling of metal sheets and exhaust ?? ... why not ? That's the same advice ...
** There's no need to be surprised... Mr. Smart. Can you diagnose the exact cause and bet on it?

 

Something that is not dependent on the rotation of the engine.

 

I'm with Bex on this, I thought the suggestion of "cylinder ignition failure" to be quite peculiar - I'll stick with my loose heat shield diagnosis, especially since all it will take to confirm is to put the vehicle on a hoist or jack stands and do a visual examination.

 

First of all, thanks a lot for the helpful responses!

I checked the heat shields but couldn’t get a proper view from above, and I haven’t had the chance to lift the car yet. However, I did record underneath the car and tried pressing on the pipe shown in the video — and interestingly, the sound reduced a bit when I applied pressure to it.

Now that I look at the video again, doesn’t it seem like there’s a heat shield on that pipe that might be loose? Could that be the cause?

Here are two more video clips for reference:

 

I'm curious about the result — if I lose, I won't have an evening beer from my refrigerator.