I have a 91 civic hatch with a JDM b16a swap in it. Car was running great a view days ago and I replaced the valve cover gasket and clean the throttle body and after that it started idling funny. Replaced 1 o2 sensor cause it ws throwing a code for. New injectors, fuel regulator, fuel filter,idle air control valve and yet its still puffing black smoke and running rich. Any ideas Im stuck

 

Lean it out?

 

easier said then done Im not very mechanically smart more on the learning side about everything.

 

Are you throwing any other engine codes?

Sounds like you might've done something with the fuel map sensor (sits on the throttle body). It also shares the same plug as the TPS, you would get codes if you switches them by accident though. Perhaps you removed the Map sensor and didn't replace it correctly? If it's not receiving vacuum it'll make the car run rich and throw an 02 code.

 

Ill try that tomorrow and see if it helps any and get back to you

 

Replaced the map sensor as well as coil pack it was bad. Still didnt make a difference in the car.

 

Check you ECT sensor

 

Spray carb cleaner around the manifold and tb to see if it has a vacum leak.youll know where it's at if it changes idle speed. Even wd40