2015 MK7 GTI DSG stuttering/hesitating under boost

[CurbSideWeg]

Just this morning on my way to work My 2015 MK7 GTI has stuttering/hesitation under boost. The previous night it worked fine. So far this occurs with every gear and all speeds. the moment the car reaches about 2 psi it starts bucking. This occurs under full and partial acceleration. My idle is fine and if I baby it below boost the engine runs smooth and shifts normally and there are no warning lights. The only modifications I have is Cobb v3. I will try datalogging after work and possibly reverting back to stock from the Cobb. Any ideas? Would a boost leak cause this stuttering? Perhaps the diverter valve?

 

[CiDirkona]

Pull codes? Could be all sorts of stuff. For 'fine yesterday, crap today' under load, my first guess would be failed coilpack.

 

[CurbSideWeg]

Pull codes? Could be all sorts of stuff. For 'fine yesterday, crap today' under load, my first guess would be failed coilpack.

Ill check as soon as I get off work to see if its throwing any codes. If its coilpack related would they act normal while idling or cruising? both of those times its perfectly fine, just while under boost does it start acting up. ill be troubleshooting on my ride home haha. do you think I just need to to be relatively easy "cheap" to fix.

 

[Diggs24]

pull codes
pull coils and plugs and inspect
drive normally on the way home, no WOT pulls.

 

[Jakeokj]

pull codes
pull coils and plugs and inspect
drive normally on the way home, no WOT pulls.

I’m having the same issues, no codes and I replaced plugs and coils. Injectors maybe?

 

[Diggs24]

I’m having the same issues, no codes and I replaced plugs and coils. Injectors maybe?

stock? tuned?

 

[Jakeokj]

stock? tuned?

Tuned, e30 mix which I know can clog injectors. I did a small pull and experienced misfire and hide cylinder, changed the plugs and coils. No code and no CEL but stuttering under minimal boost.

 

[Diggs24]

Let's see some data.

 

[Jakeokj]

Let's see some data.

Sure what stuff

 

[Diggs24]

mainly fuel params. is it cobb?

 

[Jakeokj]

mainly fuel params. is it cobb?

Yeah but I’m running a custom tune. Not using the Cobb ots. Give me a few to get the data

 

[Diggs24]

yeah, whatever you logged for your tuner should cover most if not everything needed. throw it up to datazap

 

[Jakeokj]

https://datazap.me/u/jakeokj/mk7-stutter-0?log=0&data=2-23

No idea what’s happening

 

[Diggs24]

Injectors is a good place to start but I'd start with a compression and leakdown test first before spending money.

 

[Diggs24]

This isn't good.

https://datazap.me/u/jakeokj/mk7-stutter-0?log=0&data=28-52&zoom=375-449