Sonata I45 (YF - 2011+) :: Hammering Sound Getting Louder With Speed


Nov 10, 2013

This is my 2011 2.4L Hyundai Sonata with around 78,000 miles(no warranty). For the past two days car wasn't accelerating as it used to and all of a sudden today it started to produce hammering sound. Sounds gets loud with speed. Gears are switching like normal. There is a warning signal also that is attached in the picture below.

[URL] ....

I want to know where is the sound coming from? Should i fill any oil? If so what brand and where is the nozzle located.

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So I put the car up and in gear and around 25/30 mph, the sound shows up and gets worse as the speed increases. It does not get worse in turns. And it is very consistent- not clunking or clicking, just a steady sounds almost like strong wind over an object. I replaced the wheel bearings in both front wheel assemblies about a year and a half ago.

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I then pulled the car over, it seemed to go dead, then the car did crank back up, the engine sounded much louder, like a loud rev/hum, not quiet like usual.

I next drove a mile to a c-store, transmission seemed OK, no leaks, did see a check engine light briefly, but it disappeared. Car cranked OK, headed home, same sound right at cranking and at moderate speed.

Finally, I jacked the car up on the front left, from research appears that the plastic engine shields got smacked good along the front and near the right tire and bent back quite a bit on the left side. There seems to be no other structural damage that my untrained eye could see, just one indention you'll see in a couple of the photos that I think is part of the car design at that spot.

Again, no leaks, no smoke, no caution lights of any kind now.

Photos are attached...

My Hyundai's engine now sounds like a Mustang! Hoping it's just the engine noise from these plastic covers now being bent/destroyed in some spots, exposing the engine and the typical noise you'd hear without them...

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The squealing sound can be heard here: [URL] ....

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