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Discussion Starter #1
Hey all,

A buddy of mine brought his 2012 Elantra Touring to me today with an odd problem. He's got a rattle that he says has been going on for a few months now. The rattle occurs only in two situations: (1) when going over a bump in the road, and (2) when shifting from Park into Reverse. It's a quick little "click" type of rattle, and it's soft, but I can hear it too--it's not so obvious that you'd sit in the car and go "OMG what is that sound???", but it's obvious once you're listening for it.

We attached a camera to the underside with a Gorillapod tripod, and it definitely captures the noise. He took the car into the dealer, they thought it was a tie bar that needed replacing; they replaced it, but it's still making the rattle noise.

Any other ideas? The fact the same sound occurs when shifting from Park to Reverse and from Reverse to Park, but NOT from any other gear into any other gear, is bizarre!
 

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Discussion Starter #3 (Edited)
Thanks for the suggestion.

My buddy just uploaded a video we took today by placing his camera underneath the undercarriage at the rear of the car using a Gorillapod. The video was shot sideways, but still you should be able to get the gist...you can hear the rattle pretty clearly on every bump in the road. Especially at around 1:24 and 1:52. Odd, eh?

 

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I can't really hear it on your video over the background, but obviously if you hit a bump the suspension's going to be working a bit harder, so SOME mechanical noise wouldn't be unreasonable.

My old iX20's FNS suspension rattled badly at every bump/hole (and the car was eventually replaced by the dealer with an i30) but I still don't know that I could've captured it on camera.

If it's exactly the same sound when going from P to R, and it does it every time, that should be easier to localise. Smacks of the engine shifting on its mountings slightly, perhaps, as the suspension has no connection to the engine/gearbox. Maybe you have a soft rubber mounting and the whole lump's moving very slightly when you either hit a bump or put that slight twisting force on the lump when you go from P to R or back?

Try putting the front on ramps, handbrake on, get your mate to go from P to R and stick your head underneath. You'll probably have to remove the plastic undertray first but you should be able to see/hear the noise.

Your garage mechanics could of course do this, but (1) you'd never know whether they had, and (2) they're usually just 'poke & hope' merchants, incapable of logical fault diagnosis. Obviously I'm only guessing too, but I don't have the car!

If you can't do it yourself, I would say you either take it to a specialist and pay for a report, or hope it becomes so bad that Hyundai HAS to do something about it!

Cheers - Peter.
 

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Discussion Starter #5
Thanks very much Peter :)

I'm surprised you can't hear the rattle, although I admit the background noise is a little more than desired. If you listen closely at the 1:24 and 1:52 marks of the video for a squeaking/rattle sound, are you sure you can't discern it? When my friend brought the car over to my place, I had no idea what he was talking about, but once we started driving, even over the wind noise of my head sticking out the window, it seemed pretty obvious to me. I know some suspension noise would be normal, but this seems a bit beyond that.

Your theory about loose engine mounting sounds plausible; we'll have to give that a shot (or have the dealer give it a shot).
 

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Thanks for the suggestion.

My buddy just uploaded a video we took today by placing his camera underneath the undercarriage at the rear of the car using a Gorillapod. The video was shot sideways, but still you should be able to get the gist...you can hear the rattle pretty clearly on every bump in the road. Especially at around 1:24 and 1:52. Odd, eh?

MVI 1431 - YouTube
From what I can make out, sounds kinda like a light thin metal rattle. Is this the sound? If so, it almost sounds like the flex pipe, but I know that's much farther towards the front. But has the same sound if you smack the exhaust around. Do you have access to a lift?
 

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No, unfortunately :(


Yep, that's the sound indeed!
I'd check the exhaust for rocks in the heat shields and or broken wields. Can you get under it and smack the exhaust? Or maybe just smack the muffler around a lil bit? Might also be something in the rear brakes hitting the backing plate. Def has that thin metal sound, which both of those have. You've got yourself a good one there. Don't forget to update us.
 

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Discussion Starter #9
I'd check the exhaust for rocks in the heat shields and or broken wields. Can you get under it and smack the exhaust? Or maybe just smack the muffler around a lil bit? Might also be something in the rear brakes hitting the backing plate. Def has that thin metal sound, which both of those have. You've got yourself a good one there. Don't forget to update us.
Thanks for the suggestions. I definitely will return to update this thread for posterity, if we ever get it figured out. WHEN we get it figured out ;)
 

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Yes, Canadave, agreed there is a noise (on the video) but perhaps my ears aren't as attuned! If it's the light metallic rattle you confirm to Carmine, yes, I hear something like that.

Agree with Carmine re the exhaust/fittings. That's another component which will have a slight force put on it by going from P to R.

Can't see it being the back brakes if you're saying it definitely comes from the front?

For me, it all depends on whether you're right that exactly the same noise occurs when driving as when stationary and moving the shift. The latter - if it happens every time - should be a lot easier to diagnose because the car can be examined on the ramp.

I wish you luck with it! Cheers - Peter.
 

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Discussion Starter #11
No, the sound seems more like it's coming from towards the back, not the front...although not from THE back.

Here's a video my buddy made yesterday where he put the camera on the ground facing upwards, drove forwards a couple of feet so that the camera was looking up at the undercarriage, and then shifted back and forth from Park to Reverse and back again (starting at around 1:04 of the video). Then he drove forward another foot or two and did it again. You can hear the same kind of click/rattle sound when he shifts, although I'm not sure if the video shows anything illuminative.

 

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Discussion Starter #12
Commentary from my buddy on this latest video:

"That sound comes from the transmission which is near the front of the car, and the other sound is coming from the rear of the car. Yesterday I was slowly driving down the gravel road to the beach and I opened my door and stuck my head out, and I know that sound is coming from the back end. It turns out my girlfriend has one of those Gorillapod tripods, and I was able to attach it to the FRONT end of the car, and I couldn't hear the sound at all in the video, even though I was driving down a bumpy road. I heard the sound from my driver's seat when driving the road, so I know for sure it was there. So when comparing that to the videos we took from the rear where the sound is very prevalent, I'd say it's definitely coming from the back end."
 

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Discussion Starter #13
My buddy also deleted and re-added his videos, and asked me to re-post. Here they are:

Passenger side rear wheel:

Drivers side rear wheel:

Underneath:
 

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Discussion Starter #14
Well, we have a definitive answer.

My buddy went in to the Hyundai dealership for his arranged drive with a Hyundai mechanic. They got down the road a short ways, and the mechanic says "Turn around. I know exactly what it is."

They get back to the dealership, and they go look at the car on the hoist. The mechanic points out the problem, which is as follows:

The brake pads were not worn down much at all. However, the pads themselves sit in a sort of holder, or were attached at the back of the pads (not sure which, precisely--I'm getting this info third hand), and the back of the pads had started to come loose, and were rattling around. That's what the sound was.

Now apparently the mechanic knew exactly what this was as soon as he heard it, which leads me to believe this is some kind of known problem...?

Anyway, problem solved.
 

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Good, but how is the noise from P to R caused by 'rattly pads' - a fault I've never seen anyway unless the anti-rattle shims or other parts have been left out (or have broken)? When moving from P to R or back, you're going to be on the brake pedal, surely, which would 'jam' the pads?

Were they the back or front pads?

Whatever, if it's cured. that's great, but I'd love a bit more detail!

Cheers - Peter.
 

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Discussion Starter #16
It was the rear pads loose.

As for your other question, it's a good one. I can only imagine that when shifting, the car sort of shifts (physically moves slightly) as the transmission/engine engages, and the slight movement slightly rattles the pads. A hazy guess there, and specious at best. I'll run that question by my buddy and get back to you if there's a satisfactory answer.
 
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