Odd spark plug colour

[iain.atkinson at tesco.net]

No glazing at all just an orange deposit (sooty orange)


Iain
> 
> From: Edward McCarthy <ed.mccarthy at agile.cc>
> Date: 2004/01/27 Tue PM 03:51:30 GMT
> To: quattro at audifans.com
> Subject: RE: Odd spark plug colour
> 
> The Haynes spark plug page notes a "yellow-ish, glazed appearance" resulting
> from high speed glazing, i.e., a sudden rise in temperature in the
> combustion chamber due to hard acceleration (way to go!)....
> 
> -----Original Message-----
> From: Phil Payne [mailto:quattro at isham-research.com] 
> Sent: Tuesday, January 27, 2004 10:06 AM
> To: quattro at audifans.com
> Subject: Re: Odd spark plug colour
> 
> 
> > Pulled the plugs on the 90 20v today (7a eng code) just to have a look 
> > at the condition been
> in now for 20k miles. The colour was an orange colour almost like rust,
> never seen this before just wondered if anyone out there has any kind of
> explanation. I do use an ocatane booster in the fuel but can't believe it's
> that. Car runs fine.
> 
> There's a handy colour chart in the back of most Haynes' manuals.
> 
> --
>   Phil Payne
>   http://www.isham-research.com
>   +44 7785 302 803
> 
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