I live in Canada, have a 1997 Nissan Stagea Rs4 with a s2 Rb25det in it that was imported from Japan couple years ago. I've recently had a major misfire problem that I am lost as to what is causing it. It is very random, comes and goes as it wants it seems, have recently changed coilpacks, spark plugs, coil pack harness. Also has new 02 sensor, fuel filter, air filter, etc. I had the car in at a local shop that deals with import vehicles. They looked it over and came to the conclusion it was the plug on the coilpack harness for cylinder 4 that was not making contact as they could wiggle the plug while it was misfiring and it would smooth out.
They told me 100% that it was the harness. So i bought an oem full harness. Installed it and the car ran fine for about 20 minutes. Then it started happening again. They also smoke tested it and it came out fine, no leaks. At this point im leaning towards injectors, but im looking for any other tips or if anyone else has had a similar problem, as I dont want to have to buy injectors if I dont have to.
