tgrich
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Joined: Mon Oct 04, 2010 12:13 pm
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Leaf Number: 1777
Location: Torrance, CA

clunking noise when accelerating from coasting

Thu Apr 12, 2012 3:22 pm

I have a ? that’s been in the back of my mind. I think it’s related to “gear lash”, which I don’t know really what that means but I think I could be experiencing it. Sometimes when coasting, if I hit the accelerator, I hear a kind of “knock”noise. Kind of like gears (or something else) are engaging audibly. Is this normal? I don't remember it when I first got the car a year ago, but have had it for at least a while now.

Thanks,
Tim

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TonyWilliams
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Re: clunking noise when accelerating from coasting

Thu Apr 12, 2012 3:54 pm

tgrich wrote:I have a ? that’s been in the back of my mind. I think it’s related to “gear lash”, which I don’t know really what that means but I think I could be experiencing it. Sometimes when coasting, if I hit the accelerator, I hear a kind of “knock”noise. Kind of like gears (or something else) are engaging audibly. Is this normal? I don't remember it when I first got the car a year ago, but have had it for at least a while now.

Thanks,
Tim


Tim, I don't know what you're hearing, but the gears are "constant mesh", and never disengage. The only changes are which direction they turn and how fast.
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tgrich
Posts: 38
Joined: Mon Oct 04, 2010 12:13 pm
Delivery Date: 28 Apr 2011
Leaf Number: 1777
Location: Torrance, CA

Re: clunking noise when accelerating from coasting

Thu Apr 12, 2012 4:47 pm

Its not gears per se, but it does sounds like something is engaging when I accelerate from coasting. I can also hear it occasionally when I'm the accelerator is pressed and I let off quickly.

palmermd
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Re: clunking noise when accelerating from coasting

Thu Apr 12, 2012 4:50 pm

check the center console. I have a lug nut in mine and it rolls around in there and "clunks" every time I accel or decel.
Michael

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arnolddeleon
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Re: clunking noise when accelerating from coasting

Thu Apr 12, 2012 4:51 pm

Could it be ABS self check noise?

http://www.autocarepronews.com/Article/ ... noise.aspx

arnold

tgrich
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Joined: Mon Oct 04, 2010 12:13 pm
Delivery Date: 28 Apr 2011
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Location: Torrance, CA

Re: clunking noise when accelerating from coasting

Thu Apr 12, 2012 5:01 pm

It's def not from inside the cabin, its from the front near the wheels or under the hood.
It's not the ABS self check as this happens repeatedly and at different speeds.

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aqn
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Re: clunking noise when accelerating from coasting

Thu Apr 12, 2012 8:17 pm

tgrich wrote:It's def not from inside the cabin, its from the front near the wheels or under the hood.
It's not the ABS self check as this happens repeatedly and at different speeds.
It can be lots of things: loose suspension piece, loose/broken engine mount(s), loose component (e.g. the horn coming loose, dangling by its connector) knocking about, etc.

If it's easily reproducible, I would propose taking it to the dealer. I prefer to save my ESP power for figuring out why some people are bent out of shape by one extra button push.
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ttweed
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Re: clunking noise when accelerating from coasting

Fri Apr 13, 2012 8:14 am

aqn wrote:If it's easily reproducible, I would propose taking it to the dealer.

+1
There are many things that could cause this symptom, mostly centering around looseness, wear, misalignment, etc. of front suspension or driveshaft assemblies.
Image

Have the dealer inspect it. The only clunks I have heard in our car under those conditions have been from the cans of soup rolling around in the glovebox, backseat, or trunk that my wife gives away to the homeless panhandlers at street corners. :roll:

TT
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Re: clunking noise when accelerating from coasting

Sun Aug 05, 2012 9:40 am

I have a somewhat similar problem: In slow stop and go drinving conditions (city) I can hear a light clunck noise when I accelerate and then another one (a bit louder) when I break and the car is about to stop (less than 5mph).

The slowing down clunck occurs when I think the mechanical brakes would take over regen. It doesn't happen immediately when I press the brake pedal. So I suspect one of the brake pads is not properly seated in its caliper and is moves. Hence the noise. It's not bad enough and so far I've been too busy to take a look at it myself. Most likely I'll have it checked out by the dealer during my next scheduled maintenance.
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DaveinOlyWA
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Re: clunking noise when accelerating from coasting

Sun Aug 05, 2012 9:59 am

i hadnt noticed it before because i usually have the radio on, but i hear a pretty good clunk when shifting from forward to reverse and so on
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