LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Please check out my datalogs and see what you think.

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Old 02-16-2005 | 03:00 AM
  #1  
BlackLT1_TX's Avatar
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Please check out my datalogs and see what you think.

I already had altjar look over it and he gave me some things to look at. Namely he mentioned that the right bank goes lean at idle and the left bank goes lean right before I get knock retard in second gear and third gear on the first run datalog.

I have the logs in TTS Datamaster format (.uni) and in excel format (.csv).

http://www.triplecfeeders.com/images/ta/datalog/

Thanks in advance,
James

(mods in sig below, tuned by PCMforless, motor has no more then 1000 miles on it, brand new knock sensor and lt4 module)
Old 02-16-2005 | 11:51 AM
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Re: Please check out my datalogs and see what you think.

Did you purchase unlimited tunes through PCMFORLESS. If so, Bryan would be the man to talk to. Im sure he could tell you exactly whats going on with your scan.

Brandon
Old 02-17-2005 | 01:13 AM
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Re: Please check out my datalogs and see what you think.

Mostly it looks like a severe case of split BLMs at idle, but the left bank goes very lean when you tip into it pretty hard. Could very well be an exhaust leak I'm thinking.

Im curious to see what you find when you swap your o2s from side to side.
Old 02-17-2005 | 09:21 PM
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Re: Please check out my datalogs and see what you think.

Got a new log with the o2's switched.

http://www.triplecfeeders.com/images.../newrunone.uni
http://www.triplecfeeders.com/images.../newrunone.csv
Old 02-17-2005 | 09:55 PM
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Re: Please check out my datalogs and see what you think.

In that 2nd log it says you were doing 125 mph... that cant be right, right?
Old 02-17-2005 | 10:12 PM
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Re: Please check out my datalogs and see what you think.

That is weird. It says the right speed on my speedo. Its PCMforLESS tuned, only thing I can think of is he had to change it to work with the t56 instead of the a4 I had before and I have 3.73's on top of that.

Otherwise I have no clue.
Old 02-17-2005 | 11:04 PM
  #7  
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Re: Please check out my datalogs and see what you think.

BLMs didnt switch, means your 02s are reading correctly.

I know you said you had a TB on it. Have you tried fixing the at idle split BLM by adjusting the blades at all?
http://para.noid.org/~lj/PCM%20Tutor...litBLMinfo.htm
Old 02-18-2005 | 12:20 AM
  #8  
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Re: Please check out my datalogs and see what you think.

stock t/b
Old 02-18-2005 | 12:45 AM
  #9  
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Re: Please check out my datalogs and see what you think.

Ah sorry that must have been someone else. Have you adjusted the stock butterflies at all?
Old 02-18-2005 | 01:07 AM
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Re: Please check out my datalogs and see what you think.

I posted some comments on the data logs on your similar post in the "Computer....." forum.
Old 02-18-2005 | 12:25 PM
  #11  
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Re: Please check out my datalogs and see what you think.

I just responeded to your response in Comp...

Thanks alot BTW, I hope we can get this figured out
Old 02-18-2005 | 01:29 PM
  #12  
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Re: Please check out my datalogs and see what you think.

Looking at the log "after" you switched the O2 sensors, it appears to me that the one sensor is screwed up, as a minimum. In the "pre-switch" logs, the left O2 sensor wouldn't go below 240mV or so. The right one was covering the normal range. When you switched the sensors, now the right O2 sensor does not ge below 218mV and the left one is covering the normal range. I would say sensor problem. Same symptoms I mentioned in the other thread.
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