I had an oil and plugs change in my 2006 pathfinder and the car started "jerking". The mechanic thought the plugs were probably "fake" so I asked that the old ones be fixed back. This did not stop the jerking. The car would not raise(take fire) either. A computer readout gave a code indicating "multiple random misfire" problem. A lot of causes for this problem were readout including exhaust and air ways blockage. Ultimately the catalytic converter was found to have bursted and scattered in its port. Pieces were evacuated and port welded back by a local panel beater(body shop man). The system was clear, jerking gone and car raised (takes fire) superbly. Two days after, car started smoking and oil was short. Had another oil change. Car continue smoking and goes with oil in a jiffy. Engine sounds fine, compression superb and takes fire fine as expected. But smoking continues with oil disappearing into the bargain.
Are my rings gone? If so what possibly went wrong? If not, please what is my problem and what should I do. I live in Warri, Nigeria and the nearest Nissan place is 6 hours away in Lagos. Cant even try to dive there under this circumstances. Please help!