[s-cars] Re: detination

[Paul Gailus]

It's also possible that a smaller amount of carbon could
be causing preignition problems if a piece of it starts
incandescing like a glow plug.

Paul


----- Original Message -----
From: William Noland <wenoland at pacbell.net>
To: <william.healy at snet.net>
Cc: <s-car-list at audifans.com>
Sent: Thursday, October 10, 2002 10:52 PM
Subject: [s-cars] Re: detination


> Bill -
> One possibility would be carbon build up in the cylinder head. With 94
> octane fuel (beats 91 octane California swill), you shouldn't be getting
> much detonation. Doesn't take much of a build up to increase the
> compression ratio to the point where the knock sensors just can't retard
> timing sufficiently. At your mileage, this is a distinct possibility.
> You could dose the motor with Techron and pray, or, even better, find a
> mechanic who can run a decarbonizer through the motor.
>
> Bill Noland
>
>
> >I'm new to the list, I don't know what took me so long.
> >I have a '93 S4, stage 1+ with RS2 Manifold, K&N and Stebro exhaust. I've
> >upgraded the bypass valve to a hoppin sport unit.
> >I've been experiencing what feels like a boost leak between 4 and 5 lbs,
as
> >well as
> >some detonation under hard acceleration. I'm using 94 octane fuel, and
I'm
> >not getting a check engine light. I'm waiting to upgrade my hoses, clamps
> >and vaccum lines soon.
> >
> >the car has 185K with original injectors and cats.
> >
> >Any help would be appreciated.
> >
> >
>
>
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