2015 a4 misfire issues

[Gear3223]

So I’ve got my 2015 a4 and the car runs well until it’s under heavier load or higher rpms (above 4500) then it flashes the engine light and throws p0302, p0303, and p0300. I don’t feel any major misfires maybe a hesitation but no shaking or anything. I’ve been trying to chase it down for a while and have replaced 4 coils, spark plugs, 4 injectors, intake gaskets, carbon cleaning, pcv valve, swapped maf, Fuel pressure seems pretty much right where it wants for high and low side. I’m at a loss what to look at next. Car is stock other then a cold air intake and has 170,000km on it

[Theiceman]

did you try and put your stock intake back just to remove variables ?
also what is your intake bank adaption. ? would give us a general idea of general health

[Gear3223]

I’ve tried with and without the intake, no difference either way. The intake adaptation warm at idle is around -2.4degrees

[Theiceman]

so your timing is good no issues there.. with only those codes this might be tough .. right range of plugs ? this might be a tough one without more info. you may be shooting in the dark for a while if all you are getting are misfire codes under load.

[mrg_B8TFSi]

Most likely situation is in the high fuel pressure side of the fuel .. could be intermittent HPFP or cam follower might be worn? I have seen random misfires without the Hp sensor throwing a fault.. could be a intermittent high pressure sensor in the fuel rail.. given that’s a relatively easy and inexpensive fix I’d try to replace that and at 170km it’s probably due to be replaced.. typically that doesn’t go bad but it’s possible.. I’m suspicious of it being the pump and /or the sensor or both.. that HPFP is very finicky with how much it impacts ignition timing and as RPMs increase it’s possible that the cam roller is seized a little causing inefficient pumping? Also, common for the VVT oil flow control valve to not be opening as needed to change cam profile as needed or the mag solenoid might be stuck? Maybe check those things out.. before throwing more money at it? The VVT is easy pull upper cover the solenoid is easy three t30s check the button to see if it’s moving freely


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