Odd spark plug colour

[George Harris]

When I was having problems with the 5000CDTQ running rough, the colour 
of the plugs was rust/orange, except for #2 which had a bit of black. 
Changed the hitension wires to the plugs and the car runs smooth, pulls 
strong in any gear, idles properly, in other words is running well. 
Pulled one plug today to see if the colour has changed. No, it is still 
rust / orange.

Therefore this must be a normal colour under some conditions. I buy gas 
from an independent so I don't know the brand, sometimes put Lucas 
injector cleaner in with a tank, live in SW Ontario Ca. BTW my plugs are 
those Bosch with 4 (I think, at least 3 anyway) side electrodes. I don't 
know if that would make any difference.

Cheers
George

iain.atkinson at tesco.net wrote:
> 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.
> 
> 
> Iain 
> 
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