This is 1 spark plug of 3 and this is the middle one, which has carbon and other 2 are all okayCan anybody tell me what is the problem with it? any suggestions?See the spark plug condition in attached pictures
Car: CuoreModel: 2007Spark Plug made: NGK
there could be three reason behind it1)2 cylinder is losing compression2)or spark is weak in second cylinder3)spark plug itself is bad
So what to do now?
The residue on plug looks oily to me. U have a cylinder oiling up problem.
check valve seals of this particular cylinder are dying @syncview - 1st check for engine compression, and replace valve seals of all 3 cylinder if 1 cylinder [ the bad spark plug ] differ on compression reading.