check out youtube for vids. i thought i had the same issue before, turned out headers were rubbing the body, at idle, and making full contact when moving, so it wasnt as noticeable... try youtube for an idea tho.

 

Could be a flexplate, they'll tend to clank or make a tapping type noise if cracked, but it could also just be loose tc bolts.

 

The first 15 second IDLE of this video sounds very similar to the noise I hear. However it doesnt get louder or sound near as loud as the one in this video.http://www.youtube.com/watch?v=wtK_IFA3OVw&feature=related
The whole car is stock and has the stock headers. But I'll check to make sure they arent rubbing or anything. I took it to a shop last week suspecting loose torque converter bolts. They sat me down and told me they thought it was a wrist pin! I have my doubts since it only has 93k and has had regular oil changes.

 

A wrist pin noise on a factory engine is pretty much unheard of, now if it had been rebuilt, then ok. If you pull off the inspection cover and unbolt the converter and push it to the trans you can put a light up there and you should be able to see any cracks on the flexplate.

 

Yeah they said they looked at the flexplate with a video stick and saw no cracks. But I think they might be trying to screw me. The car is a 2nd owner 93k mile car. All the oil change records and everything. Never been rebuilt.

 

It doesnt sound anything this http://www.youtube.com/watch?v=CY4wjII2jzQ

The noise is intermittent. I can start it up in the morning and not hear it. Its like I have to drive it to get it to start making the noise. Only hear it at idle.

 

Could also be a loose rocker arm chattering b/f it gets oil pressure or at idle, if they get loose enough they sound like a knocking noise.

 

I'll check that out too. Thanks!

 

can you get a vid up?

 

OK here are some videos I took today (sorry about the crappy quality)

This video is with the car warm and you can really hear the noise when the camera is under the car http://www.youtube.com/watch?v=gEkk7xrIgO8

This video shows the bad pulsing vibration that seems to be coming from under the console/ flexplate area when in D with the foot on the brake and raising the RPMS to 900 http://www.youtube.com/watch?v=BJf8j_JXTko

*The noise isnt as loud in these videos vs real life due to a shitty camera*

 

that interesting! doesnt really sound like a bearing to my ear, so thats good... can you get the car in the air and pull the inspection cover? its 4 8mm (or 10, cant remember) and it drops right down. from there you can see if all the bolts are tight and with a flashlite you should be able to see enough of the flexplate to see if there are any cracks

 

I think they're 4 13 or 14mm bolts, but yeah I'd still pull that off and give it a look.

It almost sounds like something is rubbing at that rpm and vibrating/resonating though.

 

I just replaced my flex plate recently. Car was making a ticking noise but not all the time. I put the car up on jack stands started the motor and crawled underneath. The ticking noise was coming from the torque converter area. Even with the torque converter unbolted and slide back it was very hard to see the crack. The crack was in between the crankshaft mounting bolt holes. After removing the flex plate and looking at it I still could hardly make out the crack but that ended up being the problem.

 

Did you notice any vibration or anything? Do you have to pull the transmission to replace the flexplate?

I'm looking at it tonight after school and work. Sometimes I get this bang/clunk noise when letting off the gas and then when I put my foot back on the gas. Its always light throttle never under heavy throttle.

 

Well it turns out the flexplate is fine. No cracks and all the bolts are tight. My mechanic says I need to put in regular oil no synthetic oil. He also says my motor mounts are shot and causing the engine to hit the frame plus lots of vibration.