Hi everyone, great site.

Have a 97 Cobra, 33k miles, once the engine warms up it starts making a rattling sound. It doesn't sound like a heavy thumping noise, more like a light tapping. It only does it intermittently for a few seconds then stops and will do it again moments later. Does the pausing indicate whether or not its the motor or an accessory? Heres a better video with sound...you can hear it the very first few seconds and then again around the 20 sec mark. Thanks

http://www.youtube.com/watch?v=O8Xjbw316_4

 

for me the sound file is messed up. I can hear good for like 3 secs at the start then nothing till the end and its all messed up. Could just be my computer though as i tend not to update things when they pop up.

 

yea i cant here the whole video either

 

sorry guys, check the newer video, I replaced the older one. Thanks

 

Im no engine guy but ussually what i see them ask is: Does the sound/speed increase with rpm increase? Like i said im no engine guy at all, you may have better luck asking this on a more engine based part of this forum, or even in the svt section of corral.net

 

That's pretty much how my engine sounded. Hopefully you don't have the same damage. I had a little ticking sound. Gradually it got louder and louder. When I hit the accelerator I could actually hear somEthing rattling inside of the engine. Took it to the dealership and I had threw a rod. The mechanic showed me the oil that they had drained from the engine and it was full of metal shavings. The car is fixed now and I should be getting it back this week

 

i cant tell at all from the vid...but like redneck said if its motor it usually changes with rpm...from your description it sounds like a valve tick or a rocker or something in the top end

 

That does sound like a rod knock

 

Ok I just took off the serpentine belt and the noise stopped. Any ideas? it sounds like its around the a/c, tensioner, idle pulley area

I dont understand though because it is a pattern. It will tap a few secs (5-8sec) then stop for about 10-15 secs then repeats and it doesnt change with rpms either way.

 

im wondering if your ac is trying to kick on or something but it doesnt.. like the condenser or soemthing