Re: Any problems with new oxygenated gas?

[Nick Craft <ncc@scr.siemens.com>]

<O>
<O>> From quattro-owner@swiss.ans.net Tue Dec 13 10:50:21 1994
<O>> Date: Tue, 13 Dec 1994 10:08:44 -0500
<O>> From: Nick Craft <ncc@scr.siemens.com>
<O>> To: quattro@swiss.ans.net
<O>> Subject: Re: Any problems with new oxygenated gas?
<O>> Reply-To: quattro@swiss.ans.net
<O>> 
<O>> Makes my 87 5000S ping (pink for UK readers) like crazy.
<O>> Also lose about 10% gas mileage. Switching to premium gasoline
<O>> makes absolutely no difference.
<O>> 
<O>> Anybody care to speculate on whether retarding the ignition
<O>> timing during the winter would help stop the pinging?
<O>
<O>If the noise is in fact due to pre-detonation (pinging), retarding the
<O>timing will definitely stop it.  Pre-detonation is not usually a
<O>problem in the winter, so I wonder if that's what you're really
<O>hearing.  I would suspect the real problem is lifter noise.
<O>
<O>--------------------------------------------------------------------
<O>John Greenstreet, Senior Engineer           (jgreenst@motown.ge.com)

Nah - got lifter noise as well (all year round). I'm almost sure this is
pinging, and it starts promptly as soon as they start selling the junky
winter fuel. 
I'll experimentally retard the timing and see if it goes away.

Nick.