[Diy_efi] vortec engine piston noise?

[Paul Messinger]

The local machine shops are reboring GM V8 Engines because "the factory
bored them a little oversized (too loose piston clearance) and thus they are
being bored to the next standard oversize and proper fitting pistons
installed. This from independent shop doing the work for the local GM
dealer. Perhaps this is the same problem?

Paul

> -----Original Message-----
> From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org]On
> Behalf Of steve ravet
> Sent: Tuesday, May 21, 2002 11:47 AM
> To: Diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] vortec engine piston noise?
>
>
> mike katz wrote:
> > I think you guys worry too much.
>
> That may be the case.  What I hear sounds just like detonation.  It
> happens when the engine is warm, like detonation, and under load, like
> detonation.  I don't hear it at cruise, but if I give it a little gas to
> change lanes there it is.  It's not a regular tap or clank like a
> bearing.  The only thing the service manager is capable of telling me is
> "GM hasn't determined a fix yet".  They tell me it's piston noise, but
> they did go ahead and replace the knock sensors, telling me that they
> don't what it is or how to fix it.  My spark plug guy (thanks Bruce)
> says there's no sign of detonation on the plugs which makes me feel
> better about it but I still want to know exactly what's going on.
>
> thanks for the replies so far,
>
> --steve
>
> --
> Steve Ravet
> steve.ravet at arm.com
> ARM,Inc.
> www.arm.com
>
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