AEM WB Issues

[mnetwork]

I have been pulling my hair out for 2 months trying to figure out my tuning issues after I got DSMLink.

Everything was based on my AEM Wideband screwing me up. Not long ago I finally decided to ignore the wideband and tune without it. I started by doing pulls and pulling fuel until I saw knock. Then added timing. I now have a decent tune at 23psi on my E316G. I still can't maximize my tune though because of my wideband. My wideband is so erratic and so off that it makes no sense. When i am cruising it seems fine. Fluctuates between 14.7 and low 15s. At idle stays in the same range. At WOT it is all over the map. And the more I pull fuel the more lean it shows. Now with some fuel pulled on DSMLink it will even dip into the 13s on WOT. If this was a real reading I would have melted a piston a while ago now. I would also have insane amounts of knock all the time. When I first tried tuning with the wideband I started adding fuel in DSMLink because I didn't know what to do. I did this so much that I could feel a little sputter on WOT, but the wideband never even pinned at 10.0. The wideband would be in the 10s for most of the pull, but thats it. I tried buying a new sensor for it and there was no change. My wideband is located in the stock rear o2 sensor bung on my exhaust. I have no cat and I have checked for exhaust leaks many times now. I am out of ideas and I really need help on this. Any help would be greatly appreciated...

 

[EclipseRacing99]

are you getting the number readings from dsmlink or are you actually looking at the wideband? sometimes link is off from what the wideband says.

 

[talonalex92]

I know your not going to want to hear this, but the only reason it would be fluctuating like that would be an exhaust leak. How are you checking for them?

 

[mnetwork]

are you getting the number readings from dsmlink or are you actually looking at the wideband? sometimes link is off from what the wideband says.

Link is off by about .2-.3, but I don't even bother looking at Link for the wideband anymore because I haven't been using it for tuning. I am just talking about the gauge itself.

I know your not going to want to hear this, but the only reason it would be fluctuating like that would be an exhaust leak. How are you checking for them?

Seafoam, best way I know of. I also, have an external gate on the manifold. When I am in 5th gear up in the rpms and part throttle (gate still closed), the wideband reads richer than when I just go WOT. It still does fluctuate, but not as much.

 

[LandoAWD]

Post a log of the behavior.

 

[mnetwork]

Post a log of the behavior.

Here are some of my older logs from when I thought this was a DSMLink issue. These logs were before I started pulling fuel so now it shows leaner than these...

http://www.dsmtuners.com/forums/tuning-engine-management/297912-dsmlink-issues.html

 

[Black_Bullet]

I say exhaust leak, especially if its located after the flex section.
You could take out the stock o2 sensor and put the WBO2 up in the stock o2 housing bung just for a pull of two to see if it is still giving funny readings. Your less likely to have a weird reading from an exhaust leak up there,
just dont leave it in there for long.

 

[mnetwork]

I say exhaust leak, especially if its located after the flex section.
You could take out the stock o2 sensor and put the WBO2 up in the stock o2 housing bung just for a pull of two to see if it is still giving funny readings. Your less likely to have a weird reading from an exhaust leak up there,
just dont leave it in there for long.

I've really checked for leaks. I had a very minor leak at the turbo gasket a while ago and when I fixed it, nothing changed.