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Re: Occasional "Tic"

Subject: Re: Occasional "Tic"
by DrDyno on 2014/9/24 22:13:23

Quote:

Matatk wrote:
Do you have a mechanic's stethoscope? If not, you can buy one cheap at HF or the parts store.

Are you sure it's from under the hood? Sometimes noises can be hard to trace.

Possible causes already listed were injectors and rockers. If you do indeed find it is lifters, the LS7 lifters are a direct replacement and cost effective.

Thanks for the tip on the LS7 lifters. I do have a mechanic's stethoscope and, there is no doubt the noise is coming from under the hood. It follows engine RPM and has occurred while moving (others heard it) as well as while standing still. It's rare (it's only happened twice that I'm aware of) and of short duration when it occurs.

I've only heard it once, in neutral, waiting for my garage door to open. I revved the engine a little to see if it followed RPM. It did. The second time, it was heard by a member of our local Corvette club as I drove past him into a parking lot, revving the engine to make a little noise through my chambered muffler eliminators. I wasn't looking at the tach but I doubt I revved it past 3500 RPM, and just for a second.

TH400