Need advice for engine knock/ping

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Apr 6, 2010 | 07:19 PM

bullmarket

Thread Starter

POSSE SENIOR RIDER

Joined: May 2003

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From: Suffield, CT

Need advice for engine knock/ping

Last year I put in a new air intake, GHL's and had professionally tuned.
The Vette runs great, but at around 2300 rpm's I get the pinging sound. At no other time does it do this. There are no codes appearing.
Should I sea foam for carbon build-up, change the knock sensor or ???
Any valid ideas or suggestions are welcome.
Thanks

Apr 6, 2010 | 07:35 PM

Roostertail

Melting Slicks

Joined: Oct 2004

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St. Jude Donor '06

Who tuned it? I would go back to the tuner first.

Sounds like too much timing or too lean.

Nick

Apr 6, 2010 | 07:43 PM

Chicago1

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From: Rio Rancho NM

Could be a million things best bet is take it back to the tuner and have him log it and see what the log looks like. Post up a run file if you can

Apr 6, 2010 | 08:28 PM

killain

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From: SE Pennsylvania

St. Jude Donor '03 thru '26

Oldtimer

Quote:

Originally Posted by Chicago1

Could be a million things best bet is take it back to the tuner and have him log it and see what the log looks like. Post up a run file if you can

It not a piston slap, I'd be sure to stop by the tuner. Sounds like it's a little too lean. Does it run hot, or hotter than it did before the tune?

Apr 7, 2010 | 12:00 PM

bullmarket

Thread Starter

POSSE SENIOR RIDER

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From: Suffield, CT

Thanks, I'll have the tuner check it.

Apr 7, 2010 | 12:45 PM

bucwheat

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From: 4th on the list of top 100 in USA Ga.

You are using premium gas right?

Apr 7, 2010 | 12:57 PM

bullmarket

Thread Starter

POSSE SENIOR RIDER

Joined: May 2003

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From: Suffield, CT

Yes. Nothing but premium gas, but I am running tank empty and filling with a different brand to try that.

Apr 7, 2010 | 02:14 PM

DeltaBravo

Instructor

Joined: Apr 2008

Posts: 239

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From: Georgetown TX

I get some pinging when I haven't driven it hard for a while. I usually just put my foot in it once or twice and "blow it out" - goes away until next time. If I remember to goose it every time I head out, it stays away. So, you could try a couple WOT passes to see if this helps. If not, then Seafoam/Techron combo in the fuel tank might do it; it worked for me when I had the dreaded fuel sender issue and it helped clean up the combustion chambers quite well. Having said all that, a trip back to the tuner would surely fix it, I hope.