Please help, today when i have removed plates on may exhaust mainfold i discovered that there isn,t O2 sensor or AUX port actuator as well. It is 86 NA 2nd gen and as far as i know there should be O2 sensor on my exhaust mainfold and port actuators on each side but there is none of this things (WIERD). previus owner has put in new engine on Mazda racing Austria in 1993 and it has only 20k miles on it since than. Runs great but MPG is 10-12 MPG if you drivet it easy.

Please check pictures and advise where are port actuators and O2 sensor and if maybe there is S5 engine insatlled or what realy i,m confused.

 

Could this be an engine from a 1st gen SE?

 

maybe but my car in papers has 110kw -146hp and it is EFI engine but yes production year is first of 2nd generation so i realy don,t know which engine is this

Help i,m confused!!!

 

doesnt look like a 2nd gen motor....odd