O2 Feedback looks bad. With your long term fuel trims already being maxed out and your short term fuel trims adding additional fuel your tune is way out of whack. Did you make any adjustments to the injector latency settings? You may need to increase those as well if your higer load A/F ratios are in check. If they seem a bit lean as well, then you will need to decrease your injector scaling.

-Paul

 

I havent touched anything in regards to fuel and or timing etc with the ECUFLASH.

 

 

Well it looks okay from that info alone. It seems to be MAINLY hovering around 100%. It has some swings up to 130% and some down also. The best thing to do is to log throttle position, speed, and O2 feedback or trim percentage. When the wideband is reading 21, then O2 voltage should be 0.00 of .01 . If its NOT, then the wideband is messed up.

You need to ONLY look at the O2 feedback when in closed loop operation, i.e. cruising, light throttle, less than 1 psi of boost.

Brian

 

The reason I say it looks bad is that it swings back and forth early, but the swings are much too large to be meaningful. Once it stabilizes near the end of the log it stabilizes near 110-115.

The fuel tables in EcuFlash aren't as much of an issue here as the injector scaling and latency, although with your injector scaling at 585 and your fuel trims being as far off as they are it seems that you probably have a leak somewhere between the MAS and the intake manifold. Once you verify that you have no leaks then you can look into tuning to fix the problem. What are you MAS readings at idle? If they are abnormally low that would indicate a leak.

-Paul

 

Paul,

Where do I find the MAS reading? I am looking at a Mitsulogger log and an EVOSCAN log file.

 

It's the Airflow column.

-Paul

 

They are right around 31.45

 

Exhaust leak before the 02 can cause a high reading as well. Small exhaust leak caused wideband to go from 14.0 at idle to 19.0 on one of my cars.

 

Are you talking about air fuel ratio?

 

Agreed, Fix your exhaust leak...that probably is the culprit.

 

I pulled the DP last night. Put in a new gasket and still no change.

 

I'm gonna do a seafoam treatment today to see if there is a leak somewhere I cant see. The smoke will come out of the leak if its there......

 

It may be strange but I did not scale my injector when I upgraded. I am now running 750CC injectors and no scaling. But the strange part is that I have to ADD 6% of fuel at IDLE. Only after 1500 RPM that I begin to reduce the fuel and eventually reducing about 25-30% up top.
One other thing I noticed too is that injectors don't scale linearly to the stock parts. That is, I can't just linearly set to REDUCE 50% at all load points even though I have 50% over injectors.

 

Your idle MAS reading seems within reason, so I doubt you have a intake leak substantial enough to cause your fuel trims to be as far off as they are. Either you have a leak somewhere between the head and the O2 housing or the car needs a retune. If this is the same car that was overboosting I doubt it's a leak. Rescaling the injectors smaller and increasing the 11v and 14v injector latency values should help your fuel trims at idle a bit, plus this change will be safe for high load areas as it will be adding fuel throughout.

-Paul