Breaks up at W.O.T

[626gn]

I'd start with looking at scanmaster/powerlogger data. You stated already checking all the stuff mentioned in this thread but it would be helpful to know exactly what and how you have ruled all of them out. What's your fuel pressure doing?

 

[nash421]

Fuel pressure looks right on point.. Afr is actually a bit rich. It was lacking fuel originally so upgraded the pump. Ill upload the log when I get to my laptop.

 

[TURBOELKY]

....

 

[jasjamz]

Does the boost gauge flutter when this is happening?

 

[TURBOELKY]

Does the boost gauge flutter when this is happening?

Oh man. Head gasket talk.

 

[nash421]

No boost flutter, changed plugs, wires, gap, ignition coil..

 

[GNRick]

Hi fellas, I realize this post is very old but I find myself with a verysimilar issue. i have checked all the above comments.. In high gear my car breaks ups at 5100rpm.. thru 1st and second gear under full boost there arent any issues. If I throw more boost at it, it breaks up at lower rpm ranges. Possibly valve springs? Just got it back from Tune Time and threy seem to think its ignition related. Thanks!

Are your coil and module ac/delco?

 

[Fast4Ward]

Forget one thing check everything[emoji44]...dont forget the crank sensor