Weird noise at boost

[Lino M. Valadas]

Sure sounds like pinging to me.  Your boost gauge could be wrong so you
actually doing more boost than what it indicates.  Your wastegate FV may not
be working.  The knock sensor may be bad.  For the time being ease off on
the gas pedal you are damaging your engine  (if it is pinging that is)

Lino


----- Original Message -----
From: "Eyvind Spangen" <eyvind.spangen at c2i.net>
To: <quattro at audifans.com>
Sent: Monday, September 15, 2003 7:11 PM
Subject: Weird noise at boost


> I just changed the WG spring in my '87 5kT. One strange thing occurs.
> When the boost goes past 1.5 (0.5) on the gauge, I get this weird
> noise, almost like a heat shield rattling. It occurs all the time, not
> rpm dependent, only boost dependent. I'm thinking about ignition
> pinging, but I guess the knock sensor should take care of that and
> give me the check engine-lamp at the same time? I've never heard
> pinging before, so I don't know what it sounds like.. This noise is
> like a heat shield rattling, or a tin with peas.. Anyway, on premium
> fuel and 0.5 bar boost pressure, a MC-1 should *not* ping.. Fault
> codes = 4444... Any tips? If it's just a rattling, I'll fix it next
> time I'm under the car, but if it is pinging, then..
>
> --
> MVH
> Eyvind Spangen
> - 4 ringer, 5 sylindre, 10 ventiler, men dessverre bare 2 drivaksler..