hi, i have a problem in cyinder number 2 of my car. the spark plug is charcoal black, while other spark plugs are fine, what could be causing the spark plug to go black?

the car is also knocking on idle, i dont know whats causing the issue?

i need all of yours help, thanks.

 

Injector problem or ring/valve seal damage and oil burning. Could also be the plug isn't firing. Check for bad wires.

 

Good time for a leak down test.

 

What he said. Check the injectors and plug wires. With one cyl burning rich the other three would be lean so the probe would have a stoich reading.

 

thankyou for your reply, yes i will check all of these today and report back.

 

yes i will do that, thanks.