Rattling at Exactly 2500 rpm

[kerv]

Hi.. i don't know if this is related to any other problems anyone else has been having with heatshields, but this is my problem.  When I rev to 2500rpm, i hear some sort of rattling sound.  I can't tell where it is coming from.  It goes away at 2600rpm.. and I will not hear it again until i decelerate past 2500rpm again.

I had my exhaust manifold shield and timing replaced about 1 month ago and I have been hearing this rattle ever since.  I wasn't sure if it was rattling before these repairs since I had tons of other stuff rattling at the same time (timing and manifold shield)

Any ideas?

Thanks

[MY Garage]

all i can think of is a shot exhaust manifold gasket.

[Alias]

Same here. I think its the cat heat shield.

[DrDubbleB]

Open up the hood and have someone rev it for you. &nbsp;Try to locate the problem that way, then come back and ask again. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'>

[tzonni]

my brother has a problem similar to this, &nbsp;he has a 99 civic si, and his thermal R&D exhaust is broken inside, and it rattles at low RPMs.

[S13Grl]

If you do what DrBubbleB told you (great advice), and you don't hear the rattle under the hood or see it present on the exh. manifold shield, then it's your piping/cat shields.

[dephrag]

I have the EXACT same problem..except mine rattles EXACTLY at 2,000 Rpm. &nbsp;I for the longest time thought It was the timing chain, because it sounds like a chain rattle for sure... maybe its not so bad after all.. &nbsp;I just don't want to take it to a garage, and get ripped off, end up having to pay them out my ass. &nbsp;If you figure this out, PLEASE let me know..I'm taking mine in next weekend to replace some belts so, i'll have this checked too!

James