C5 LS1 engine rattle when revving
Pro
Joined: Aug 2009
Posts: 662
Likes: 0
From: Loxahatchee FL
Has nothing to do with the cam. Sound was there before. No it's absolutely not a normal sound. If it was then every person here would have it.
Do you hear your injectors inside cabin? No but under the hood you can easily hear and determine it. Do you hear the lifters inside? Not usually. I can because I know what I'm listening to and with headers it's amplified. People that are very in tune with there cars can hear things that some cant or are able to tell when something changes its quickly picked up on.
Anyway, trying to find it is very important to me as if its something small now it could be really big later
Do you hear your injectors inside cabin? No but under the hood you can easily hear and determine it. Do you hear the lifters inside? Not usually. I can because I know what I'm listening to and with headers it's amplified. People that are very in tune with there cars can hear things that some cant or are able to tell when something changes its quickly picked up on.
Anyway, trying to find it is very important to me as if its something small now it could be really big later
Pro
Joined: Aug 2009
Posts: 662
Likes: 0
From: Loxahatchee FL
My internals are very clean almost
Spotless. There's a lot of different opinions about running anything through intake. I did it but won't again. Nothing bad happened but at same time nothing happened at all. No difference in anything.
Spotless. There's a lot of different opinions about running anything through intake. I did it but won't again. Nothing bad happened but at same time nothing happened at all. No difference in anything.
Supporting Vendor
Joined: Jan 2013
Posts: 407
Likes: 11
From: Mooresville North Carolina
Too bad you aren't closer, we'd be glad to take a listen. I would check the flex plate. They are sneaky, when they crack they can easily incite panic making you think there's something wrong with the engine.
Here's one on a Trailblazer SS we did the other day. You can see the super fine crack in this photo off of our facebook -
Here's one on a Trailblazer SS we did the other day. You can see the super fine crack in this photo off of our facebook -
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Drifting
Joined: Apr 2009
Posts: 1,898
Likes: 9
From: Morrisville PA
Sweet seafoam makes a spray now, I didn't know that.
http://shop.advanceautoparts.com/web...=seafoam+spray
Enter P20 at checkout and choose pickup at store to save 20% too.
http://shop.advanceautoparts.com/web...=seafoam+spray
Enter P20 at checkout and choose pickup at store to save 20% too.
Drifting
Joined: Apr 2009
Posts: 1,898
Likes: 9
From: Morrisville PA
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Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
My guess would be the flex plate. Here's are pictures of the front flex plate assembly. The extra pieces bolted onto the standard looking flex plate are the adapter to clamp onto the input shaft of the torque tube. You can get some pretty bad noise if there's a crack in either of those plates.
http://www.ebay.com/itm/97-Corvette-...-/271101090467
I didn't see anything mentioned, so I'll ask if the noise changes with the car in gear vs out of gear?
http://www.ebay.com/itm/97-Corvette-...-/271101090467
I didn't see anything mentioned, so I'll ask if the noise changes with the car in gear vs out of gear?
Burning Brakes
Joined: Jul 2009
Posts: 976
Likes: 53
From: smyrna de
i had a very similar sound from my ls6.... swore it was a dead/bad lifter... ended up being the header gasket was shot causing a metalic/rattle sound on engine decell... fooled me cause it didnt sound like a exhaust leak at all!
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
I'll post up when I know what happened. Mine is an LS6, so it is a manual trans.
I had this car for years. It just started making this noise when I got off the freeway and was slowing I heard it. at idle it went quiet, so I figured it was not me. I went to go and heard it start back up. My heart stopped. I reved at the next light very lightly and the noise came back on. I was already driving for 45 mins at this point. If it is piston slap, it is the bad kind.
And the noise is not normal. Much louder then the sewing machine noise often mentioned on here.
I cleaned all the carbon off everything, and replaced every single gasket of anything I took off. Pistons ring lands were all in tact. Cylinder bores were fine as well.
Once it was back together, it fired right up, I let it idle to warm up, then reved to 1500 rpms and the noise came back on. I almost had a fit.
I decided to do a rebuild because I want more power, and I am not letting it be. I don't want my short block trashed if it does decide to let go.
I had this car for years. It just started making this noise when I got off the freeway and was slowing I heard it. at idle it went quiet, so I figured it was not me. I went to go and heard it start back up. My heart stopped. I reved at the next light very lightly and the noise came back on. I was already driving for 45 mins at this point. If it is piston slap, it is the bad kind.
And the noise is not normal. Much louder then the sewing machine noise often mentioned on here.
I cleaned all the carbon off everything, and replaced every single gasket of anything I took off. Pistons ring lands were all in tact. Cylinder bores were fine as well.
Once it was back together, it fired right up, I let it idle to warm up, then reved to 1500 rpms and the noise came back on. I almost had a fit.
I decided to do a rebuild because I want more power, and I am not letting it be. I don't want my short block trashed if it does decide to let go.
Drifting
Joined: Feb 2010
Posts: 1,720
Likes: 38
From: Colorado
I'll post up when I know what happened. Mine is an LS6, so it is a manual trans.
I had this car for years. It just started making this noise when I got off the freeway and was slowing I heard it. at idle it went quiet, so I figured it was not me. I went to go and heard it start back up. My heart stopped. I reved at the next light very lightly and the noise came back on. I was already driving for 45 mins at this point. If it is piston slap, it is the bad kind.
And the noise is not normal. Much louder then the sewing machine noise often mentioned on here.
I cleaned all the carbon off everything, and replaced every single gasket of anything I took off. Pistons ring lands were all in tact. Cylinder bores were fine as well.
Once it was back together, it fired right up, I let it idle to warm up, then reved to 1500 rpms and the noise came back on. I almost had a fit.
I decided to do a rebuild because I want more power, and I am not letting it be. I don't want my short block trashed if it does decide to let go.
I had this car for years. It just started making this noise when I got off the freeway and was slowing I heard it. at idle it went quiet, so I figured it was not me. I went to go and heard it start back up. My heart stopped. I reved at the next light very lightly and the noise came back on. I was already driving for 45 mins at this point. If it is piston slap, it is the bad kind.
And the noise is not normal. Much louder then the sewing machine noise often mentioned on here.
I cleaned all the carbon off everything, and replaced every single gasket of anything I took off. Pistons ring lands were all in tact. Cylinder bores were fine as well.
Once it was back together, it fired right up, I let it idle to warm up, then reved to 1500 rpms and the noise came back on. I almost had a fit.
I decided to do a rebuild because I want more power, and I am not letting it be. I don't want my short block trashed if it does decide to let go.
Intermediate
Joined: May 2008
Posts: 30
Likes: 0
From: turnersville nj
heres audio of my 2000 vert
this sound is from the same area as yours had it for about 5000 miles now. still dont know what it is.
Last edited by tvwbug; Feb 7, 2013 at 03:04 PM. Reason: added vtext
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
Drifting
Joined: Apr 2009
Posts: 1,898
Likes: 9
From: Morrisville PA
http://www.youtube.com/my_videos_edi...id=Fw7iZ7GbTz8
this sound is from the same area as yours had it for about 5000 miles now. still dont know what it is.
this sound is from the same area as yours had it for about 5000 miles now. still dont know what it is.
Trust me, if it is something serious, you will know. A lifter going bad does not really tick. It TAPS and it is LOUD. Same with bottom end noise. It is a hollow tap, not a tick.
Thread Starter
Cruising
Joined: Feb 2013
Posts: 14
Likes: 0
Sean b. Im about 2 hours from Hunstville, over near Tupelo, Ms.
Just made another video of my noise, its pronounced at 2000 rpm and up exactly! I may just end up carrying it to the stealership for a look but I am hoping someone else has experienced this before and can chime in!
www.youtube.com/watch?v=Jqv9ZLM-MIU
Just made another video of my noise, its pronounced at 2000 rpm and up exactly! I may just end up carrying it to the stealership for a look but I am hoping someone else has experienced this before and can chime in!
www.youtube.com/watch?v=Jqv9ZLM-MIU
Drifting
Joined: Apr 2009
Posts: 1,898
Likes: 9
From: Morrisville PA
Now that video sounds exactly like an exhaust leak.
It does not sound like an internal metallic noise. It has that exhaust leak slight flutter noise for sure.
Run that seafoam through and see if you can see smoke. Or have someone plug your exhaust pipe while you do your test and see if it gets louder.
It does not sound like an internal metallic noise. It has that exhaust leak slight flutter noise for sure.
Run that seafoam through and see if you can see smoke. Or have someone plug your exhaust pipe while you do your test and see if it gets louder.
Thread Starter
Cruising
Joined: Feb 2013
Posts: 14
Likes: 0
Thanks mchicia1. I think youre right. Makes sense. No loss of power, no metallic flakes in oil when changed yesterday, no engine lights, only audible when above certain rpm and hotter the louder. I appreciate the advice Im going to give it a try!
Drifting
Joined: Apr 2009
Posts: 1,898
Likes: 9
From: Morrisville PA
I have had lifter failure, it showed up BAD at idle. A really bad metallic tap. I have blown #7. That sounded like marbled in a can at idle.
Generally speaking, bad engine issues will show at all rpms, not just at a certain one.
Good luck, hope you find a leak.