Buzz/rattle on low rpm deceleration?

tomrdy

Member
 Sydney, Australia
Hey guys I've been chasing rattles and noises lately - solved one today - and just found another! :D

At low rpm (usually 1st or 2nd) crawling around, as the car is decelerating and coming to a near stop - right before you would probably clutch-in to stop - I'm hearing a "buzz" sound. It stops immediately if I clutch-in or accelerate. I can only hear it with my windows down and I'm guessing pedestrians can hear it as well.

It sounds like when you were a kid and you put a playing card in the spokes of your bicycle wheels.

It is very consistent though seems to only happen once the car has been driven for a short while (couldn't notice anything driving cold). I also cannot replicate the sound free-reving at a stop.

- From digging online, the most reasonable suggestion I've read is a loose clutch plate spring - though my car had a new clutch done right before I took ownership (so I was told with receipts). This seems to make the most sense to me though.

- Another suggestion was "engine resonance" coming through - but it seems too buzzy for that.

My car does have a pretty clunky sounding clutch sometimes when I disengage it too fast at low speed but that's been like that for as long as I can remember - and general consensus I was able to gather here is ... it's sorta just like that (dual mass etc).

I have had a look at the heat shields underneath around the exhaust and from what I've seen they don't appear to be touching anything.

Anyone else have a similar buzz from their car?
 
Well had a chance to try and pin point this a little bit more today with the help of a friend.

Turns out I CAN replicate it free revving which rules out the clutch involvement.

It's only present coming down from ~2k and stops as soon as idled. My mate's first reaction was "that sounds a motor revving and then slowing back down to idle...".

After I heard it do it while stationary/free revving, I'm pretty sure I've heard this before even with my standard exhaust - perhaps it's more pronounced/louder now with the SS set up and I'm wired to listen to issues since I've been chasing rattles.

Youtubed some random cars revving and they too have this little flutter sound. I suppose it's the dregs of exhaust coming out before the car sits back on idle.

I guess its nothing!
 
Just a case of old fashioned paranoia then :D

Other sounds to listen out for:

- The sound of damp rubber being dragged across glass whenever you wipe the windscreen in wet weather.

- A loud thud every time you shut the car door.

- A droning noise that gets louder and higher in pitch as you press the right hand pedal in the driver's footwell.

:P
 
wonkydonkey said:
- A droning noise that gets louder and higher in pitch as you press the right hand pedal in the driver's footwell.

Gosh golly I've been noticing that a lot lately along with some *CRACKLECRACKLE* sounds every time I let off said pedal! Requires further investigation :P
 
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