[s-cars] 1995.5 s6 Avant -rattling noise from underneath

[bob.rossato at att.net]

Have you checked the heat shield around the Y pipe
leading to the cats?  The sheet metal tends to corrode
and becomes a source of rattles.  I just took some tin
snips and cut off whatever was remaining on mine when it
started to rattle.

Bob
> Under acceleration through certain RPM ranges in
> certain gears I hear a rattling noise from underneath
> the car.  It sounds like it might be directly below me
> - or slightly in front and below.  Noise is a metallic
> rattle- like shaking ball bearings really fast in a
> coffee can.  Not extremely loud but definately
> noticeable.  It appears to be associated w/ these
> conditions:
> 1st & 2nd- don't hear any noise
> 3rd- 2500-2600 rpm - rattle
> 4th - 2200-2400 rpm  - rattle
> 5th - somewhere around 1800 - about 2100 (basically
> "lugging the motor") - rattle(don't normally run it
> like this -but this was in the name of science)
>
> If I am out of these specific ranges - there is no
> rattle.  Also disappears when I let off the gas.
>
> If I start below the the range and accelerate through,
> the rattle appears in the specified range and
> disappears after.
>
> Any ideas? I've only had the car for 2.5 weeks, and
> I'm trying to make sure this is not a major problem.
>
> Also, thanks to everyone who replied to my earlier
> question about the Bose radio code.
>
> -Bill Perron
> Bristol CT
> '95.5 S6 Avant
> '85 4kq
>
>
>
>
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