Fuel Cut?

[FabzDSM]

Well I know its not because I am tuning with dsm link but cannot seem to find out what is causing this problem. At roughly 700hz on my maf my o2 sensor is reading super lean. It bogs, I cant even pass someone on the highway. It will only go like this until I hit about 800hz on my maf. I cant seem to find out why, added fuel all the way on the sliders(dsmlink) still no change just a tiny difference. Any help would be appreciated.

[Zeppelin]

You say O2, is it a wideband? Are you logging knock at the same time? Have you done a boost leak test?

When pushing 700hz, what's your boost and RPM's at? What mods do you have done?

[FabzDSM]

No, I just ordered my wb, I was reading the 02 log off of dsmlink and no knock. My boost and rpms can differ according to when I hit the 700hz. I will post a log for those who can view it. My mods are in my sig.

[Zeppelin]

Have you calibrated your GM MAF for DSMlink? My money would be on that right now.

[thiazole]

The first thing that comes to my mind whenever I hear these symptoms (because it is so common) is spark blow out. If it takes a crap right when you hit full boost (during the boost spike if you have one), that is usually the case. The cure is a tighter gap on your plugs (or you just need new plugs or wires).

[prophecymiller]

This could be quite a few things...is this happening at full throttle or partial? Does the engine abruptly stumble or just lose power? Is there any sound associated with the symptoms?

I would start with checking pre-turbo intake for leaks, like mentioned earlier check your plug gap, boost leak test, fuel pressure, turbo condition, definitely check for pre-O2 exhaust leaks, and last I can think of is your fuel filter.

[JayRolla]

The first thing that comes to my mind whenever I hear these symptoms (because it is so common) is spark blow out. If it takes a crap right when you hit full boost (during the boost spike if you have one), that is usually the case. The cure is a tighter gap on your plugs (or you just need new plugs or wires).

I had this issue and tightened the gap up all the way too .022 and still had the issue. Come to find out it was a boost leak.

I would calibrate the maf and do a boost leak test.

[FabzDSM]

Calibrated the maf, I do have a boost leak at my bov flange, as well as when I open the throttle manually my throttle body shaft seals have a massive leak. and creating a high pitched whining sound which my guess is causing the abrupt stumble. I will gap my spark plugs lower, and it can happen at wot or partial depending on when the 700hz kicks in. Turbo is in fine condition, and there are no leaks pre o2.

[JayRolla]

I notice you are running e85. You do have a wbo2 right? What afr are you seeing?