mike171085

hi guys i am new to this forum so bear with me i have a 1998 sti ra and for some reason it has started fouling the plug in number 2 and smoking alot me and a friend have just taken the plug out and it is fouled with oil,i was just wondering if anyone had any idea wat has gone on the car thx for ya help in advance guys

Slowboy Racing

Sounds like you could have oil getting up past the rings, ie worn or damaged piston, ring or bore.

rezaP1

have a read here Spark Plug Analysis

Oil fouled plug:
A spark plug shorted by excessive oil entering the combustion chamber is shown below. This is often caused by piston rings or cylinder walls that are badly worn. Oil may also be pulled into the chamber because of excessive clearance in the valve stem guides, or badly worn valve stem seals. If the PCV valve is plugged or inoperative, it can cause a buildup of crankcase pressure. This condition can force oil and oil vapors past the rings and valve guides into the combustion chamber.

scubbay

iTrader: (61)

Piston damage? compression test advised