Hacked mas swap to unhacked tuning questions

[Gstclipse69]

OK , I have been fine tuning my car with my safc since i bought it with a hacked mas already on it. I got a mas that is unhacked and was trying to swap it in my car because of #1 I believe it is a culprit for my horrible idle problem. When its real hot outside in the summer ive got idle surge and when its winter I just cant hold an idle at all. Anytime the clutch is depressed it just wants to die and always idles low no matter what. I blocked fiav, looped coolant lines, cleaned egr, replaced shaft seals etc.. And #2 I've been reading its not such a good idea to hack your mas.

At any rate, I installed the mas and started the car, and of course it was rich. So I quickly adjusted the safc to -10 (since I have 550s) and got the afr to about 14-15, and let it idle until fully warmed up. I was reading the guide to setting up low fuel trims in the tech section and how to get your fuel trims to 100% and I kept adjusting the safc to try to get the ltft and stft to 0 and the ltft and stft never changed. The values on the wideband kept changing richer and leaner as i adjusted but the fuel trims didnt move at all? I was kind of stumped. Am I missing something here or going about this in the wrong way?
Any guidance would be helpful. Thanks

 

[steve]

I kept adjusting the safc to try to get the ltft and stft to 0 and the ltft and stft never changed. The values on the wideband kept changing richer and leaner as i adjusted but the fuel trims didnt move at all? I was kind of stumped. Am I missing something here or going about this in the wrong way?

From the DSMLink Wiki: Fuel Trim Update Points

First the ECU has to be in closed loop for the STFT to be updating.

On a 2G, All of the following have to be true for a full 5 seconds.
If any single one is not true even for a millisecond, the timer starts over and trends in STFT will not be moved into LTFT.

* Coolant temp >= 180F
* Intake air temp < 133F
* Baro >= 22.9 inHg
* Baro <= 31.6 inHg

 

[Gstclipse69]

Thanks Steve, I'll give this a try and more closely monitor these parameters.

 

[Gstclipse69]

Ok I have another issue. I was logging a couple pulls and I notice that my 02 sensor 1 bank 1 is not registering anything. I've read and from my understanding the o2 sensor 1 is what your supposed to look at, as I would imagine this is common sense. On my pocketlogger ive got the option to look at o2 sensor 1 and o2 sensor 2. The o2 sensor 2 is at least registering somthing but what it says doenst correlate with what my wideband says. The problem being however is that like I say, the o2 sensor 1 reads like 0.04 volts all the way through wot.??? Is my front o2 sensor bad?

 

[steve]

Sounds like it and that would keep the ECU from going into closed loop which is the first requirement listed above.

 

[Gstclipse69]

Alright cool at least I know whats wrong now. One more question, I was looking at a site with oem replacement parts and for o2 sensors they had a bosch and a denso sensor both said they were oem. The bosch was like 89 and the denso was 67, would either of these be fine or would the bosch be better? Thanks for the replies!