[s-cars] update - was ping vs. rattle

[Calvin Craig]

Totally agree on the rod knock diagnosis.  I have had two cars in the past
with rod knock and this is definitely in family.  You might want to pull the
pan and take a look before you trash the crank beyond the point you can turn
it down.
--Calvin

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of John Cody Forbes
Sent: Wednesday, January 26, 2011 10:54 PM
To: james McCarthy
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] update - was ping vs. rattle


Sounds a bit like a rod knock except the part about getting louder on
warmup.

-Cody (mobile)

On Jan 26, 2011, at 10:47 PM, james McCarthy <jjssmccarthy at yahoo.com> wrote:

> Thanks to all those who chimed in so far.
>
> So here's what happening:
>
> It's evolving... began with rattle/clatter/ping noticeable at 2800-3200 -
didn't hear with WOT - I thought (perhaps) because I was just blasting
through it.
> It's growing in volume (and RPM range now at 18000) to a very audible and
and become more rhythmic tick - almost valve like but more regular and
stronger with the occasional valve clatter I've gotten when the oil got a
tad low (down a quart). Can also faintly also hear it with falling RPM (off
throttle) where as before you had to be on the gas.
>
> While standing with the hood up and modulating the throttle it really
sounds like it's coming from the head to me - released the serp belt (no
change). Still don't hear it at idle - but perhaps I will soon...
>
> It's definitely RPM related in frequency - no difference with clutch in or
when stationary.
>
> Several listers speculated headgasket failure - for a little background I
replaced the head gasket 1 year ago and put new lifters in at that time.
Compression is 130 in all 5 with no coolant loss and no washing machine
cleaning effect on any of the spark plugs - so HG seems less likely (no way
to check leak down at home).
>
> Doesn't seem like exhaust leak - stromung with no heat shields - as it
sounds higher up. All exhaust studs are in place (wagner RS2 unit).
>
> One last tidbit is it seems to get louder once the car is warmed up.
>
> So where to go from here? Tempted to tear off the valve cover but if
everything looks OK what next.
>
> Any thoughts you have would be greatly appreciated.
>
> Thanks
> -jamie
>
>
>
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