I've noticed this rattling noise recently coming from my engine bay. At WOT, or close to it, around 3000rpm (or lower but i never stomp on it that low) I hear this inconsistent rattling. Kind of like a "ping pang tick" noise. The noises are at a low fequency too, like "ping........tick.......pang...." It sounds like something is just bouncing around in my engine, or if you dropped a penny on the floor, but it only does this at lower rpm and a lot of throttle. Maybe it is just that I can't hear it a higher rpm or something or when the engine isn't quiet. Anyways, my car used to make this noise, but I just figured it was a heat shield somewhere. I had a header, cat, catback installed and it went away. Now it's creeping back and slowly becoming worse.

Any ideas?

 

The first thing everyone will tell you to check is your Heat Sheild... the one on the exhaust manifold or "header".

Goodluck and hope that helps.

 

If you already checked the heat shield, see if could be coming from a different source. Put car in neutral, locate the throttle cable and manually rev the engine from the front and listen. Try to locate the noise. It could be many small things. Hopefully it's something stupid that can just be tightened. Good luck

 

a bunch of heatshields located underneath the car. jack it up and see whats up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jerbear! &raquo;</TD></TR><TR><TD CLASS="quote">a bunch of heatshields located underneath the car. jack it up and see whats up</TD></TR></TABLE>

When I saw the title of the thread, I immediately thought heatsheild. I have the same problem, it started about a month after my cat-back install. Something just loosened up after heat cycling all the time, so I just have to find which one it is and tighten it.

 

yep check your heatshields

 

I've had this problem before with a heat shield. The one on my exhaust manifold is gone cus i have headers, and my cat is less than a month old so its not that one...I don't hear this noise when i'm not moving. It's only when my car is under high load and low rpm.