 Mystery Misfire Datalog Datalog recording the car running and encountering a few blips of the misfire. Datalog is of me starting the car, driving around the neighborhood a little and doing some baby pulls or downshifts. I noticed the misfire when in second gear in low rpm (1500 rpm i think) when i was making turns. To restate, we have determined the car is simply eating spark plugs. hardware wise, everything has been replaced (plugs, packs, injectors, injector harness, hpfp, lpfp, and pcv-non oem) and compression is 175 +- 5 on all cylinders. Intake valves do not need carbon cleaning either. Only thing we have figured out is that if you throw a fresh spark plug in, the car will run properly for a very short period of time. The misfire is in cylinder 3 and does not move around. When the sparkplug fouls enough, i get code "hide cylinder" essentially shutting it off completley. a fresh spark plug restores this, but not for very long. This particular plug has maybe 5-10 miles on it and its already begining to misfire.
- Car is 2015 Audi A3 Quattro (stage 2 EQT 93 oct.) |
08/28/2025
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