I wondering if anyone has any suggestions on how to fix a code 73. I have a 99 Civic Si and it turbo'd. It just recently happened about 2 weeks ago. I checked the rest of the post on random misfires and have check everything that people have said to check.

Plugs
plug wires
cap and rotor
injectors

Can anyone shead some light on my situation?

 

Did you check them or replace them? Things like cap, rotor, plugs, and/or wires can look ok but be malfunctioning. Have you reset the code to see if it comes back?

 

I replaced the plugs, plug wires, and upgraded the injectors from 310's to 440's. The only thing that wasn't replaced was the cap and rotor which was checked by the guys that did the work to my car. I have disconnected the battery but the code come back.