I have a 99 civic coupe EX with a 99 Jdm GSR engine in it. I recently noticed that the car was running rich. The tail pipe was laced with black dust (inside).
So I suspected a bad O2 so I replaced it (the one on the header) and am thinking of getting the one on the catalytic converter done too.
But I have notice a significant drop in oil. From one day being full and 3-4 days later completely dry.
I just replaced the O2 2 days ago and the oil has not been dropping drastically so far during 2 days of both normal and aggressive driving.
I use Mobil 1 race oil. And premium gas either 91 or 94 octane. The gas mileage went down as well. Prob 300km-350km a tank.
Have been looking under the hood and under the car, no visible leaks at all. The engine does not overheat. The sparks plugs have a bit of white layered deposits with the ring laced with black carbon deposits but not on the grooves.
Can a bad O2 cause an engine to burn oil?
My catalytic converter is prob done should I replace it?
No blue smoke so far.
Thanks in advance.
Compression tests on all 4 cylinders were very close to 210 on all 4.
Monday, August 19th, 2019 AT 7:17 PM