Ok so to start off I bought a 2006 B7 A4 last year with 127k miles and got it stage 2 tuned by an authorized Unitronic dealer. I went from stage 1+ to stage 2 and all these issues started happening and have been on going for quite some time now. I’ve been trying to track down the problem bit by bit but I’m just sick and tired of guessing and thought I would finally come on here for some help. Anyways I’ll try to explain the problem in as much detail as I can. So my car runs great with low speeds. It can rip through the gears like no problem (manual trans btw). But when in 6th gear under heavy load let’s say starting at 80mph if I floor it my car does not like it and starts to have slight misses here and there which progressively get worse the closer to 100mph I get, but then by the time I’m going 100mph almost every time exactly at 100mph the misfires will get so bad that the car decides it needs to go into limp mode. Now most of the time it doesn’t throw a code (usually when it’s really abrupt and disorienting misfires) but sometimes it does and it’s codes like p0089, p2293 and a few other ones in the past (which I don’t remember anymore off the top of my head) but these are the current codes it throws. I’ve got an upgraded GFB diverter valve I’ve replaced the hpfp and the cam follower which was absolutely worn through. I replaced the fuel pressure regulator to a higher bar rated one for tuned or more power cars (I think it was something like going from 30 bar to 35 bar or something like that) I’ve replaced the fuel filter, air filter, and spark plugs (ngk bkr7eix with .030 gap) today and replaced coils a bit ago. I have a lpfp that I snagged off a parts car a bit ago and that’s the last thing I need to try but before I go through that hassle is there anything that I might be missing here or is there a sensor somewhere that could be causing this. I took it to Audi at some point in this process and they said I needed a new hpfp but that didn’t change a thing everything is still the same as far as the fueling issue. On another note I wish I could do data logging to see what the fuel trims and pressures are under load but I don’t have access to that. So if anyone has any pointers before I go ahead and put the lpfp in lmk. Thanks! Btw car is now at 157k miles.


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