Annoying Rattling noise

Tiny
TMA2010
  • MEMBER
  • 2006 HYUNDAI ELANTRA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 30,000 MILES
I drive a 2006 hyundai elantra with around 30,000 miles on it and lately there has been a rattling noise coming from the engine bay. It happens around 2000 rpm and only in drive. I narrowed the noise down to the area around the waterpump and alternator. I also tried turning the AC on and off and I found that the noise was greater when the AC was turned on then when it was turned off. What could this be and how can I fix it?
Wednesday, December 8th, 2010 AT 8:41 PM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Check A/C idler bearing for noise, take off belt and feel for rough operation or noise when you free spin it.

Mark (mhpautos)
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Thursday, December 9th, 2010 AT 11:37 AM
Tiny
TMA2010
  • MEMBER
  • 2 POSTS
Checked that and it ran smooth without noise. I also went around and tightened every bolt I could reach. There is another problem, I dont know if its related but, now im getting a check engine code 2270 saying that sensor two is lean. This code pops up and goes away at seemingly random intervals. The noise also has developed into a sporadic sound. Sometimes it is there and other times its not. I took the car to a mechanic and replaced my A/C compressor but the noise and light still remain. What else could it be?
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Tuesday, January 18th, 2011 AT 5:35 PM

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