LFZ

I've heard this noise recently and am pretty sure its coming from the right side of the engine below the fuel rail cover. In the video, try to ignore the classic LS7 sewing machine tick, and listen to what sounds like a squeaking - cricket like sound that gets faster as you give it gas. Almost sounds like a busted wheel on a bad shopping cart you get at the grocery store.


Car is a 2008 C6Z06 with 18k miles. Bone stock LS7 with only a Halltech intake and catback exhaust.

AgainstTheWind

I’d pull the serpentine belt and check the pulleys, tensioner and balancer and also inspect the belt

Apocolipse

Sounds like a failed camshaft lobe / lifter to me

Pull the belt off, run the car, if noise is still there … time for winder mods.

LFZ

Oh man...don't tell me that..... I will definitely pull the belt and see what happens.

LFZ

BTW...car idles fine, has normal power, and nothing unusual as far as driving. At first I thought it was the drysump as there is a recall for that of something coming loose, but the sound is very distinct towards the fuel rail cover.

Apocolipse

Im still voting on a failed lifter. Take the belt off will know. Also it’s not the drysump at all.

subfloor@centurytrans

+1 on a failed lifter.

You might get lucky once you pull off the serpentine belt and have the noise go away, but I'm intimately familiar with that sound and it's never good.

I'm also intimately familiar with how a lifter can get stuck in the lifter bore so I'd definitely recommend not running it anymore than you absolutely have to.

Last 1

The dreaded tweet bird sound (lifter)

racerx3317

I vote lifter too. You lucked out. Could have been far worse

Apocolipse

As mentioned - highly suggest not running the engine anymore or driving it anywhere as you are just spreading metal through the motor

torquetube

I agree with the lifter diagnosis. Also notice that the noise is repeating at cam RPM, not crank RPM.

chevyjeff

in with lifter diagnosis and a pic of how mine looked making that sound

LFZ

Damn....

Thanks guys for the help. Now as to what to do................

furious427

Did you pull the belt and see?

LFZ

I haven't yet...Will try and do that this weekend. At this point thought, you think its worth it still?

Pb82 Ronin

Bummer brother. Sorry to hear. No way to really get to it without the head coming off.

LFZ

I know man.....last thing I want to go through right now.

MTBSully

pull the belt and see. You'll know immediately. If belt is off and its still squeeking, you know what has to be done. if it isn't start checking pulleys.

KS_Vette

Yes, pull the belt. It takes like 5 mins, if you are somewhat familiar under there, to do this test.

Then you will at least know more and maybe no longer be burdened with hideous uncertainty.

LFZ

Will pull the belt and see. Will let you all know…..