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View Full Version : O2 Voltage acting weird...



TooManyFords
03-20-2007, 04:44 PM
I need some tuner help...

Saturday I spent the day trying to get my idle dialed in figuring that if I could get the normal closed loop tuning really close that my tuner could just tweak it and then concentrate on WOT.

This is using SCT ProRacer 3.0 software with a BMD0 computer.

I dug out the LaSota manual and watched the DVD sessions again as a refresher course. Then I turned off Adaptive Tuning in my current working tune and started with a baseline log in LiveLink. The result was that my STFT's were off from idle to 3000 rpm, from 1.011 up to 1.072 and back to 1.0 at 3000. I made my first set of adjustments to the transfer function and tested again. Same thing and almost the same STFT's. I then checked the forums and realized I was applying the opposite changes than required. Oops. Ok, so I apply the corrections at the appropriate places in the MTF, reflash and then log.

I did this 6 times and each time the STFT's in the logs continue to return the same readings! How can that be? I even made a double amount change in the last trial and still got the same data in the logs.

To make sure it wasn't the XCal2, I started off with a stock tune and applied the 60lb injector value file and then loaded that. Car started right up and idled at 2800 and never dropped below that. Ok, the XCal2 works.

I was going to go through the procedure of setting the Throttle Body idle procedure but I just can't get the idle and STFT's set...

/// Ok, that was Saturday night. ///

Monday after work I went out and purchased a new pair of upstream O2 sensors thinking that the ones I have must be bad requireing the constant open loop tuning that I have been running.

No soap.

LINK TO TUNE AND LOG (http://www.cvmusclecars.com/images/03-18-002.zip)

I'm just as confused as before. The log has a lot more items including all the O2 fields. The O2 voltage logs show activity like they are warming up near the beginning of the log but then taper off and just go to 0. What does that mean?

I guess I'm asking for anyone to look at the log and the tune and see if you can see anything I might have missed.

Thanks in advance.

John

magindat
03-21-2007, 05:51 AM
John,

Sorry to hear you're having so much trouble. As you know, I'm no tuner, however, as you also know, often the solution is simple. I wonder if your O2's are not heating. Is there a signal going to them to heat up? and if so, are they maintaining the heat for good readings?

That's all I got, simple, I know, but worth a check?

Good luck.
Rich

TooManyFords
03-21-2007, 06:55 AM
Some people have been reporting that the Bosch units have a hard time heating up... It's just weird that the maker of one of the best wide band O2 sensors would make such a cheap aftermarket replacement though.

Live and learn I guess. Off to Ford at lunch to get factory parts and take these Boschs back.

If it happenes after that I will post another log.

John

Loco1234
03-21-2007, 10:04 AM
Hmmm this is interesting....
I wish I had more to add but Im certainly interested to hear the final outcome...

Please keep us all posted....