As longtime readers of this website might be aware, my main car is a 2021 Suzuki Swift Sport (ZC33S/3rd generation Swift Sport).
I’ve owned the car from new, and it is my daily driver alongside my 2006 Volkswagen Touareg that I use for taking the dog out, doing tip runs, transporting items, or when the weather is bad and the crappy NZ roads develop even more potholes than usual.
However, since purchasing the Swift Sport I have had a recurring, annoying issue that I haven’t been able to solve – and it also seems to be plaguing some other owners.
I’ve just had someone else comment on my Suzuki Swift Sport review article complaining of this exact issue, so figured I’d start a standalone post to discuss it further and see if we can attract any more complainants, for lack of a better term.
The issue is a distinct “buzzing” noise on throttle at lower RPM in the rev range – most prominently around 2000-3000 RPM. The buzzing noise is particularly noticeable when the engine is cold.
It is NOT a direct injection ticking noise (that is common to DI engines). It is more of a mechanical vibration/buzzing sound that rises and falls with the engine RPM.
It tends to disappear when the engine warms, although can almost always be heard if you listen hard enough.
When I purchased the car, the noise was not present on the demonstrator I drove (and in fact I had previously driven an automatic demonstrator that I was considering for my wife’s car, which did not have the noise). I’m a fairly fussy car owner, and there is no way I would have purchased a new Swift Sport had I encountered the same noise on the demonstrator.
It also wasn’t present when I very first collected the car with delivery KMs, but developed after about 1000kms.
I’m not the only one with this problem, as I’ve participated on a couple of Suzuki forums where others have reported the same issue.
The car has been back to the dealer a few times, who has repeatedly said it isn’t an issue and is just a normal, “to-be-expected” sound for this particular engine.
My suspicion is the Suzuki Swift sport buzzing noise is caused by one of the two items:
- The thin metal heat shield that sits at the front of the engine – discussing on forums with other owners, this seems to be the most likely culprit. My theory is that the vibration of the engine effectively resonates through the heat shield and amplifies it. I’m guessing that as everything heats up and expands, there is less “wiggle room” and therefore the noise reduces in prominence. On the forum threads I’ve participated in, some other commenters have indicated their independent mechanics believe the heat shield to be the culprit.
- Some aspect of the throttle body, as the noise is only there when the throttle is applied (not at the same RPM range on deceleration, if that makes sense?)
Part of the problem with the Swift is that it doesn’t really make much in the way of exhaust noise to mask the problem, nor is there much in the way of sound deadening. I’m sure you wouldn’t hear the same on something like a Fiat 595 Competizione which has a nice burbling and crackling exhaust.
With that in mind, I’m really writing this to see if anybody else is having the same buzzing noise issue on their 3rd generation Suzuki Swift sport.
If so, please leave a comment below describing your experience and whether or not you’ve had any luck fixing the issue.