3.0 High Speed Miss

[djpeters]

I got a high speed miss. Pulled the spark plugs. This is #1...


#2 has a slight amount of the same.

#3 & #4 look normal.

Do I have a bad head gasket?

 

[Scott Danforth]

looks like oil fouling.

could be rings, could be head gasket, could be valve seals. time for a round of compression and leak down testing

 

[djpeters]

looks like oil fouling.

could be rings, could be head gasket, could be valve seals. time for a round of compression and leak down testing

I pulled the distributor cap off and the contacts have deposits on them and the rotor is dirty also. I had oil spewing all over the motor last week from a cracked oil filter and there's a film inside the cap. Going to run and get new plugs, cap and rotor. While I'm at it I want to check the timing. I know I need the shunt and have read the procedure. Where would I find the timing spec? Motor is an OMC Cobra 3.0 GS Model #302CPHUB, it's in a 1995 FourWinns Freedom 170. Thanks,