Recently pulled out spark plugs and noticed two colored spark plugs. Dont know what can i understand from these. One portion is coca brown and other is blakish. Looking at chart provided i cant figure out what should i consider them.

Please share what ever do you think in this regard.

 

Those plugs are pretty well worn. As far as the colour goes, a tan brown is usually what you want to see on the insulator. Where you have it all over the place it kind of looks like you might have been burning some dirty gas or gas with some additive in it.

Have you been using any sort of fuel additive lately?

My suggestion would be to put in a new set. Then take the car for a good spirited drive and check them again.

 

No i dont have any fuel additives. I suppose its dirty gas then. Unfortunately I have tank full of it . I have brand new set lying around. Will change and them and upload again

 

That looks like long term deposits.... Not sure that it would be from just one tank of gas.

The new plugs will help you out for sure. Hopefully they will clear up that fouling as well.



Post up pics when you get a run on the new spark plugs.

 

It's a normal color. They just look old like Ghost said. Remember to regap the new ones.

 

Are those iridium plugs? If so, how long have you had them in there?

 

Yes they are. I do not know how much time they were in i bought this ride 4 months ago. Before I changed the car ECU car was way too much advance so that i could hear pinging. It may have damaged them

 

They got pretty hot. Which was that pinging sound(lean) you heard which could be a bad tune or spark and fuel issue. The electrodes on them look bad. New ones typically have a even Hershey Kisses shape on them. If you car is basically stock meaning you don't have crazy internals and the car isn't making more than 400whp or running E85 all you need is NGK V-Powers 2 bucks a plug or a Platinum NGK for less spark plug changes at about 12 bucks a plug. The other thing to remember that most people don't know is that some regions of the US during the winter get gas from the manufactures that have higher Ethanol content to keep the gas from freezing when its stored underground which is great but for the consumer can cause lean condition situation as it burns much hotter than typical warm weather gas. Hope this helps.