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57 Posts
Well, I've done my fair share of searching, though it seems everyone's misfire issue is all different. First off, my car is a 1993 Miata. I'm going to guess that the misfire has nothing to do with any of the modifications I've done, but about a month ago I did a DDMworks Elk intake, and a TopSpeed exhaust with test pipe.
I noticed it when I went inside of the store on tuesday, came out, and it started on 3, but quickly went back to 4. At work I checked the plugs, noticing that 3 and 4 were coated in oil, which i cleaned off. After work that night, mid way driving home it randomly started misfiring again. Today I start it, and it runs on all 4 for about 2 minutes, and once it starts warming up it starts misfiring again. So far I've replaced my plugs, my wires, and my valve cover gasket, which fixed the oily plug issue. My compression is good across all 4 cylinders, all of which read about 145-150psi. I've noticed when its misfiring that if I remove the wiring from injector for cylinder 3, nothing changes. Which in that case leads me to believe that the injector is plugged, although when I start it, it runs close to normal. All the injectors pass the noid light test, as well all of them click when I do the screwdriver test.
Any words of advice?
I noticed it when I went inside of the store on tuesday, came out, and it started on 3, but quickly went back to 4. At work I checked the plugs, noticing that 3 and 4 were coated in oil, which i cleaned off. After work that night, mid way driving home it randomly started misfiring again. Today I start it, and it runs on all 4 for about 2 minutes, and once it starts warming up it starts misfiring again. So far I've replaced my plugs, my wires, and my valve cover gasket, which fixed the oily plug issue. My compression is good across all 4 cylinders, all of which read about 145-150psi. I've noticed when its misfiring that if I remove the wiring from injector for cylinder 3, nothing changes. Which in that case leads me to believe that the injector is plugged, although when I start it, it runs close to normal. All the injectors pass the noid light test, as well all of them click when I do the screwdriver test.
Any words of advice?