[Diy_efi] vortec engine piston noise?

[Andrew Theurer]

Wow, and I thought I had it bad with a slight driveline vibration on my n=
ew=20
Toyota Tundra.  Makes me very happy I have a healthy V8 (so far, knock on=
=20
wood).  These types of stories have always scared me away from buying a G=
M=20
product.  This time it was down to the Tundra V8 and the 2500 HD.

-Andrew


On Tuesday 21 May 2002 10:25, Ruffruff8888 at aol.com wrote:
> I do.
>
> I purchased a 2001 silverrado 6.0 liter. It starting rattleing at 3000
> miles. I thought it would quit at about 12K. It got worse.
>
> I contacted a service manager I was good friends with and he indicated =
the
> problem was a loose bore in the engine and the pistons are rocking in t=
he
> sleeves. (piston slap). GM dyno'ed the engines until death and decided =
that
> 150K was the life of the motor and these noisy motors would make it the=
re.
>
> GM has a Techincal service bulletin on the issue and it plan and simple
> saids "DO NOT REPLACE MOTOR" .
>
> The service manager told me a couple of farmers in his area would not t=
ake
> no for the answer and drained the oil, blew the motor, put the oil back=
 in
> and brought the truck in for warrantty on a new motor. The factory uses
> different motors than what goes down the mass assembley line so, you ge=
t a
> better motor under warrantty.
>
> I traded my 2001 for a 2002 after only 30K of miles. Mine rattled ALL t=
he
> time. I could not stand it. Sounded like a deasil.
>
> Heres another bit of info. The corvettes had the same problem. Loose bo=
res.
> GM replaced the pistons only on those motors under warranty. Well, I do=
nt
> have a corvette, but this what the dealer told me when I was getting my=
 new
> 2002.
>
> GM seems to have resolved the problem for the 2002 6.0. I have 12K on m=
ine
> and it seems to have only normal noises.
>
> I have owned the 99 (first year for 6.0 in 2500) and 2001, and 2002 tru=
cks.
> The 99's were the best year. I could run with a North* cad with that tr=
uck.
> However, it was a 3/4 ton light and weight was lower with the 6.0 engin=
e.
>
> Loyde
>
> > If anyone has some concrete information on the piston noise problems
> > with the new Chevy vortec truck engines, like what causes it, how it'=
s
> > diagnosed, what it sounds like, etc., can you get back to me directly=
?
> >
> > thanks,
> > --steve
> >
> > --
> > Steve Ravet
> > steve.ravet at arm.com
> > ARM,Inc.
> > www.arm.com


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