Am new here so please dont hang me

[ReDsT@R DRiFt@R]

This is maybe been its own post but have been searching for an answer for the last two days online so here goes.................................................................... My 92 240sx fb with 259,xxx miles that i just bought #2 injector gained to much resistance n stopped working replaced it but forgot to put new o rings on it n drove to auto parts store to get injector cleaner(was running fine b4 i left) on the way started running like s*** n blowing white smoke. So i replaced o rings bottom o ring was destroyed put everything back together runs great but still smokes. Never overheated and has better power than b4. The color of smoke leans towards a blown head gasket compression is 150 145 145 145. Have read online of others cars with same problem: head gasket, FPR diaphram blown, run car for 30mins to see if smoke stops or my friend told me ect sending wrong info to ecu causing rich condition. He's a smog tech n the day b4 stuff went bad he 5 gas analyzed it over 250ppm HC's n hi NOX's others were good. Any help with this would b great and thank u in advance.

[nuinqua]

yeah, somehow coolant is getting into the combustion chamber.

[ReDsT@R DRiFt@R]

yah maybe intake manifold gasket but i don't see how was doing injector stuff. Maybe it was the intake gaskets time to go. Coolant level is always the same though. Am gonna try the few things I said and last will check the intake gasket i guess its all I can do. Thanks if u think it could be anything else post me.