Thought I'd post this here a well and see if I can get more reactions.
So I'm still tracking down this issue. I have done all that was suggested by the wonderful folks in this forum. The car, (2016 Hyundai Veloster 1.4 GDI Turbo), has new Hyundai OEM coil packs, new NGK plugs gapped to .028. I have checked all connections and grounds. After doing all this, the car runs perfectly normal for about a week. At some point after that, if I accelerate hard, I will get a backfire that sounds like it's before the converter close to the engine and I will get the cylinder 4 misfire code, and sometimes a general misfire code (cylinder undetected). After that, the car will run like crap until I replace the #4 coil pack. This seems to be a recurring problem on a lot of these engines. Am I missing something obvious? BTW, I did have it to Hyundai and all they do is replace the coil pack. That's fine, but my extended warranty is about up and this will get very expensive real quick after that.
If this were the "old Days" I'd be looking for a timing/advance issue. The car isn't throwing any codes that would indicate a problem with the crank or cam sensors though.
So I'm still tracking down this issue. I have done all that was suggested by the wonderful folks in this forum. The car, (2016 Hyundai Veloster 1.4 GDI Turbo), has new Hyundai OEM coil packs, new NGK plugs gapped to .028. I have checked all connections and grounds. After doing all this, the car runs perfectly normal for about a week. At some point after that, if I accelerate hard, I will get a backfire that sounds like it's before the converter close to the engine and I will get the cylinder 4 misfire code, and sometimes a general misfire code (cylinder undetected). After that, the car will run like crap until I replace the #4 coil pack. This seems to be a recurring problem on a lot of these engines. Am I missing something obvious? BTW, I did have it to Hyundai and all they do is replace the coil pack. That's fine, but my extended warranty is about up and this will get very expensive real quick after that.
If this were the "old Days" I'd be looking for a timing/advance issue. The car isn't throwing any codes that would indicate a problem with the crank or cam sensors though.
