In my 98 EX I have a stock 2000 B16A. When I punch the gas at get high rpm's and when theVtec kicks in it will blow black greyish smoke. I am assuming it is running rich. Also the inside of the rear tail pipe is black.

I do have a check engine light on due to the secondary 02 sensor not functioning due to the wires before it getting fried for some reason.Can the secondary 02 sensor not functioning cause theengine to run rich? or may it just need a tune-up or injector cleaner?

 

ur running rich , i have the same issue u just need to get it tuned

 

tune the air fuel ratio and you're set

 

Thanks guys! How do I go about tuningthe air fuel ratio. The engine and fuel pressure reg is stock.

 

check your valves too. does it have mechanical or hydraulic lifters?

 

I have no idea. Its a 2000 B16A w/ 40,000 original miles. I am pretty sure it is just running rich.

 

if you change the rear o2 sensor that can have an impact on y ur running rich.

 

That did cross my mind, although I thoughtall the secondary o2 sensor does is measure the catalyst.