The problem is that I disbaled Closed Loop to see if I could find out what was causing the problem which I did. It is a super rich condition during idle and during a slight press of the gas pedal during cruise. So, the car is not running well with Closed Loop disable or enabled.

If Closed Loop enabled, the car will gradually continue to push the trims very negative until becomes undriveable and/or throw a P0172. If Closed Loop disabled, you will noticed the super rich conditions no matter what you do to the latencies/scaling or MAF scaling.

I checked for boost leaks and could not find any.

I tried my last backup rom and some others that are known good ones and still have the same situation.

O2 feedback: In order to rule that one out, I will need to buy and replaced the O2 with a new one. However, the car have the problem even if closed loop is disabled.


yes sir! That was a typo. What I did was to T the BOV source to provide one to the EBC.

I will double check the BOV for any leaks and installation.

There were two additions to the car since I dynoed it... the red and the LICP which forced me to re-route the vacuum/boost source. I just can not recall if the new LICP was already in the car when I dynoed or not. That would rule out if the LICP is part of the things that were changed when the car started to act up. The car was in two towers for about 2-3 months due to travel at work and parts availibility.

 

The T in the BOV source sound fishy to me. Run a line directly from the intake manifold to the BOV.

Use the boost source to go to the BC. Then from the BC to the waste gate actuator.

Keeping them seperate will offer better response for both.

 

Update:

1. Tried a known working BOV and the car still doing the same.
2. Installed a vaccum/boost block to eliminate all the Ts around the IM and BOV. Did a boost leak test and everthing seems to be right on spot.
3. Tried a fresh stock rom and just ported only the needed stuff to start the car (Latencies, Scaling, Immo, etc) just to rule out a corrupted rom.

The car still doing the same. I am leaning towards an electrical or electronic issue. The car idles fine but goes very rich after TB lift-off.

I am running out of ideas! I will be looking to get new injectors as those are the only thing that I can think off may be related to this issue.

I am open to any other ideas!

 

Im actually having similar issues. My car is pig rich at idle and at cruise, like in the 10's. This started happening 2 days ago after I tried to change my "x" and "y" axis in my fuel and timing maps. Stupid I know, but even when I changed it back to the map before, It still does the same.

I spoke to some people and everyone comes back to a fuel problem. From my 255lph walbaro, to my fuel regulator. I'm getting very annoyed of this car.

 

My car is doing the same thing. Swapping out 02 sensors tomorrow. I'll let you know if it helps. It's so annoying. I understand where your coming from man.

jason

 

02 sensors didn't work. Sorry buddy. If you find anything that works, please let me know. This problem is very odd.

 

Leaky injector?????

 

O2 sensor did not work or me either.

Leaky injector??? You mean fuel leak or vaccum leak at the injector O Ring?

Thanks!

 

I mean the injector isn't holdin back fuel....thus it leaking between pulses. In other words, a bad injector.

 

Got it! I am also leaning that the root cause may be a faulty/leaky injector(s).

I have tried numerous of tests and all came back good. I am looking for the stock injectors to rule this one out and just can not remember where I place them. Oh well!

 

No luck on my part. How about you??

 

Well! I disabled closed loop and tried to tune the idle/cruise section to compensate the drastic change from very rich to stoich in a snap causing the erratic portion of the idle->cruise. After doing that, I improved the MPG over the closed loop. BTW, I am running the SD patch.

I still need to get some injectors and possibly replace the resistor box to be able to rule out anything related to fuel injectors.

 

Update!

Today, I swapped the injectors to the OEM ones to see if the rich condition persists. I was in shock to notice that the DAMN situation is happening with the OEM injectors as well.

After close monitoring of the AFRs, I noticed that the rich condition happens only when the car is at vacuum. Once the car is very close to atmosphere or pressurized, the rich condition immidiately jump to the "expected" value in the AFR. For example.... If I was expecting a 13.5 at any specific load/rpm (this is based on my experience with the car), the car would run like 10.9-11.1 AFR just before 0 (Atmosphere) and suddenly jump to the expected value of around 13.5 in an instant after crossing the 0 on my boost gauge. I tried that in every gear and it is always the same; more pronounced on the higher gears and low loads.

What may be causing a RICH condition only on vacuum?

Not sure what should I be looking for to find the root cause of this situation. Any ideas?

 

Do you have any datalogs to show? Monitoring inj pulse, timing, WBD, HZ, etc. Datalogs may help, maybe not. Any additional info would help- this is a weird situation.

 

Something has to be leaking somewhere. Vacuum leak check the heck out of the thing.

Have you disabled the EGR system? Messed with any of the EGR tables?

Sounds almost like you are just not getting enough air at idle. Have you tried a BISS adjustment?