Noise from engine/bay

1995 HYUNDAI ELANTRA
13,000 MILES
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RHINO3K
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Hi

I have a 1995 Hyundai Elantra (J1) and whenever I start the car up, a loud vibrating/rattling noise comes from somewhere in the engine bay. It doesn't sound as if anything is loose though. To narrow it down:

The noise is there only when the car has been standing for a while;
It only makes the noise between (roughly) 1500rpm and 3000rpm;
After the engine warms up, the noise disappears.

Any helpful suggestions/info would be highly appreciated!
Mar 8, 2012 at 5:46 PM
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RASMATAZ
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Could be a valve lifter leakdown problem if its coming from the upper part of the engine
Mar 8, 2012 at 5:54 PM
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RHINO3K
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It sounds as if its coming from where the pulleys are. The noise is now permanent.

Thanks a lot.
Apr 20, 2012 at 3:57 PM
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RASMATAZ
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Sounds like you need to open the front cover and investigate the T/Belt, Tensioner pulley, idler pulley,counter shafts
Apr 21, 2012 at 4:30 AM
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RHINO3K
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I have managed to remove some parts around the noise and discovered that when i push the tensioner pulley down, the loud knocking noise disappears. could it be that the auto tensioner pin knocking against the tensioner arm is causing this noise? i removed the tensioner pulley and noticed a gap between the auto tensioner pin and tensioner arm.

please help
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May 8, 2012 at 3:53 AM
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RASMATAZ
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Replace the auto tensioner and arm
May 8, 2012 at 5:01 AM