My car just startes doing this yesterday for the second time since i owned it. I gave it a nice clean air filter and some new vac lines and this is how it treats me . First time it was a combination of having old plugs in the rear bank and new in the front and a leaking bov. This time im not so sure. It drives prlerfect then epic lean missfires for no reason.
AEM wideband, boost gauge,Y-pipe, Dieted, borla exaust,BOV,MOMO wheel, vac reduction, NGK plugs/wires, 25spline tranny/tc
To Be Installed: seattle bearing short shift, new stearing rack, solid engine mounts, MAF-T, 99 lifters, gates racing belts, 3sx tbeltcover, fidanza flywheel, ninja hotwire kit, k sports, 3sx rails+loop, AEM fuel pump, type-H RFL BOV, ninja MBC.
i think my problem may have something to do with a clogged injector. My car used to idle fine then miss when a load was put on it, then clear up around 3k rpms. I did the vacuum reduction, new fuel filter, new plugs. it eventually got worse and started missing at idle so i was able to pull the coil wires on by one to find the bad cylinder...my plug was jet black and i couldnt smell any gas on it. Going to test some more tonight and see if the ECU is grounding the circuit out to fire the injector.
Just to update. I found that I had a bad injector. It progressively got worse that just low rpm missing and hesitation to missing all the time. The injector ohmed out and everything but must have been clogging up our just failing. Just got a new injector on and she has never run this good!
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I can't recall whether or not I disconnected the active aero or not.
With that being said, my lean misfire issued has resolved (and I still have the active aero hooked up). I'm not sure what fixed it as I changed so many variables at once, but I think it was likely related to an airflow issue possibly related to resonance in the intercooler piping system. The reason why I suspect this is because of the pressure fluctuations causing the BOV to blow off if I was to hold the rpms between 2700-3200 rpm.
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