Annoying Rattling noise

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?

2 Replies

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

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?