17 replies to this topic

[daenesh]

guys i took my spark plug out to check on the mixture and i noticed that spark plug no 3 had a weird yellow color on the tip but the rest of the plugs were grey.. here a picture.. what does this mean?

 

 

 

 

Plug no 1, 2 and 4 are all grey..

 

[maccers]

I'd say they both look normal, maybe if anything the yellow is normal and grey is not?

[Rosslin Racing]

have a look at this site  may help you. http://totalruckus.c...hp?f=44&t=83867

[daenesh]

well its just that one plug being different from the others thats bugging me.. 

[Tamworthbay]

well its just that one plug being different from the others thats bugging me..

Swap it over after cleaning and have a look in a week or so, that way you can make sure its not down to a dodgy plug.

[daenesh]

thats a good idea will do it tomorrow.. but as far as it looks.. seems okay right.. not a major problem right?

[Tamworthbay]

thats a good idea will do it tomorrow.. but as far as it looks.. seems okay right.. not a major problem right?

I wouldn't think so, but it is an odd colour!

[daenesh]

hahaha yeah thought so too so thats why i shared it for all to see..

[daenesh]

heres an update.. i took the plugs out and cleaned them and re-gapped them and put them back and took it for a drive and now all the plugs have turned to the yellowish color in the picture above.. good or bad sign?

[Dusky]

Has something to do with leaded petrol orso I think

[daenesh]

There's no leaded fuel in Malaysia.. only unleaded.. I use unleaded RON95..

[Dusky]

'Shiny or Glazed Porcelain: This occurs for two reasons, excessive idling or rich idle condition leaving heavy soot deposits. These deposits will burn and create excessive porcelain temps causing the glass to melt usually resulting in a down track popping through the exhaust..

You will usually see splotchy deposits on the plugs after the run, either green or yellow in color and of course the tell tale shiny glaze. 

This glazing of the porcelain actually becomes a conductor and the spark will jump from the electrode to the porcelain resulting is a very weak small if any spark. 

The porcelain should always have a chalky or dull finish.

'

[KernowCooper]

Yellow indicates lead fouling usually, which eventually causes a misfire.

[Tamworthbay]

Yellow indicates lead fouling usually, which eventually causes a misfire.

But it's only been run on unleaded, its a weird one!

[jaydee]

Wierd colours as shown above are due mainly to the use of fuel additives, including the manifacturer additive package.