[Diy_efi] vortec engine piston noise?

[Tom Sharpe]

Does the ecu retard spark and hurt mileage??? maybe we should get the epa 
involved... (just kidding)
On Tue, 21 May 2002 13:46:57 -0500, steve ravet <sravet at arm.com> wrote :

> 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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