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Loud rattle noise at 3000 rpm?

37K views 28 replies 13 participants last post by  Longbow 
#1 · (Edited)
I jacked suspended my car today because I took all my wheels off. It was up for about a good 5 hours. Anyways, when i lowered it and put everything back on and started driving. I noticed a loud and nasty rattle noise coming from the engine at about 3000 rpm. Imagine a exhaust rattle, except it's coming straight from the engine...

I jacked up the car on the back from the rear diff.. did that mess anything up? What could cause that rattle sound?

Thanks a lot.


EDIT: I ran out and made a video:

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

you can hear it...

What's causing it?

Thanks
 
#4 ·
Straight from the engine, like right in front of you?

Could be the heat shield, could also be the heater core vibrating but that tends to happen while accelerating, check the grommets where the heater hoses go through the firewall. There's a simple fix if you think that's it, couple zip ties around the hoses pulled snug should quiet it up, not gorilla tight just snug.
 
#8 ·
I think I've located it the rattle. It's the heatshield from the pipe before the cat(toward the engine.) It looks rusty and wimpy. How would I make it not rattle? Using one of the metal O rings? But wouldnt that just make the gap bigger?

How much of a efffect it would have if I remove the heatsheild? I'm going to have to pry it off because it's all rusty anyways.. Will it damage the car? I commute with the car for 4 hours straight every 3 months or so for school.. if that matters.

Thanks!
 
#9 ·
i fixed it by soaking a sock in gasoline and then wrapping it around my heatshield.. it muffled the rattling.
 
#12 ·
lol ya i know my spelling is bad. Im working on it tho lol you should see me hand writing to realy see bad. And ok i know this is even more noob but ya im still a noob and im learning. Is it the heat Shield you see right over the header or is there another onesomewhere els idk about. And agin ya i know im a noob lol.
 
#18 ·
ya pretty much, you can take it off though, it shouldn't make TO much of a difference but nonetheless there will be some more heat coming off em'. If you put it back on then you can maybe use some thread-lock? Idk if that will melt or make stuff worse for some reason but i'd imagine it would help it not come loose again for a good while.
 
#25 ·
I've removed the Cat heatshield and clamped the Header heatshield. That didn't solve it.. I swear that noise is comming from the intake manifold.. I'm I crazy? How sure is everyone about not having a, oh I don't know a screw or anything, in the engine?

Any other suggestions?

Thanks
 
#28 ·
OH hell no. I always shift around 3000 rpm. ALWAYS. I slow down for potholes, and I usually tell my passenger to get out of my car when I go over speedbumps (I'm kidding). But I treat my car better than my girlfriend, so I KNOW it's not one of those oh-****-maybe-I-shouldn't-have-done-that things.

It randomly just did that one day
 
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