[Diy_efi] vortec engine piston noise?

[Matt]

This is not the first case of improper piston fit that GM has had.  FWIW, I
remember quite a number of early 2.2Ls having to have pistons fitted due to
excessive slap.


----- Original Message -----
From: "Paul Messinger" <paulm at tenforward.com>
To: <Diy_efi at diy-efi.org>
Sent: Tuesday, May 21, 2002 2:45 PM
Subject: RE: [Diy_efi] vortec engine piston noise?


> 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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> >
>
>
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