Maybe you guys can give me some insight on this. I hope this is posted in the right place.

I've been dealing with some issues with my 1.8t for a while now and cannot figure out what the F*** is going on.

At part throttle in pretty much any gear (less severe feeling in 4th and 5th but still present on the boost gauge) the boost tends to drop suddenly right around 0" Hg 0 psi down to 5-10" hg and then pops back up, all without any influence from me on the accelerator pedal.

I took a look at all the blocks related to MAF and pre cat O2 (002, 030,032,033 and 034) and they all checked out. Idle trim is rich (-.4%) and multiplicative is also rich (-1.6%) but not out of spec by a long shot.
Pre cat O2 binary is as it should be: 011-111 fluctuating. Heater works.
Maf is 3.82 g/s at idle so in spec.
O2 sensor control is a bit low (-1.6%-4% fluctuating) and returns to -1.6% as a general baseline
O2 passed aging test with a 1.32 (original with 180,000 miles, not bad!)

What else should i test to figure out where this is coming from? and what is happening? Am I missing something?

Also, upon deceleration, every time on deceleration, the revs hit idle (aprox 800) and then bounce up to about 1200 and then return to 800. What the hell is with this?

List of things:
-No rear O2, catalyst is gone, straight pipe. Tuned out O2 properly, plus issue was present long before catalyst got removed.
-Recently replaced fuel pump
-Recently replaced ignition coil harness
-MAF is non OEM aftermarket
-Cone filter, silicone TIP
-2.0TFSI solenoid diverter valve, tested and working properly. Problem was present long before installation of DV
-VTA CCV, no PCV system anymore. Problem was present before this.
-Full ss 2.25 magnaflow catback, doubt this has any influence.
-No SAI, no evap. problem existed before this
-AWP engine code but converted to bolt down coil packs.
-Junkyard hitachi coil packs, still good though, i've felt coil packs go bad, this doesn't feel like that. Can they gradually go bad?
-WOT and boost on full is fine. If anything, I over boost at 14 psi on gauge sometimes (stock tune with fueling and boost, just emissions changed)
-CLALSH, CLAHSHE, CLAHSH, CDHSH, CDHSHE, CDLASH, CDLSH, CDLDP, CDTES, CWDLSAHK, SRYLS, CDKAT,MSLUB, GWPLDU, SVDLDUVS, KFNWSE changed

-Long ago, when engine was stock, problem still existed, minus rpm float, that began recently, not marked by any mod or pattern that I can discern.

I also have two codes for random multiple cylinder misfires and cylinder 2 misfire but that has changed before in the past to cylinder 1, 3 and 4 based on how/when I clear codes.


Help me out guys!! I'm stumped!! Trying to save a bit of cash before I go whole hog and just replace the MAF, O2, injectors, coil packs, FPR, MAP and plugs with new oem.

edit: log for reference

VWVortex cross post.  It's more appropriate here to yell at you for no logs.  ME7Logger logs or bust.

I know this isnt the place for this but can I at least get this application working so I can take some damn logs? What is going on here?

VCDS cable in dumb mode.
Blue KKl cable
Vag tacho cable

Ok. Ill try again. Ive installed them multiple times for multiple cables

What is your IRL and IOP?

Does it do it on a stock file?

Fueling request is shit.  Too lean early, too rich late.

See attached screenshot.  You need to work on BTS fueling.

To keep it simple for starters, you may want to consider numbing BTS fueling by increasing TABGBTS and modifying LAMFA to control your fuel request based on drivers request.

EDIT: This looks like a stock boost profile...  I think you have unnaturally high calculated EGTs (perhaps due to the o2 spacer you are using) that's causing this.  You would need to log the correct variables to confirm though.

Also, wont numbing BTS increase EGT's?