Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

Freescan cells from 0-15. Are they OK?

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Old Jul 26, 2007 | 08:46 PM
  #1  
mrmint69's Avatar
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From: Post Falls, Idaho
Freescan cells from 0-15. Are they OK?

Ok, i ran the car and it would give me Cells from 5,6 & 11 only beside the 16 through 18 that i got from light acceration and idle. Here is what the Freescan showed that was from the lower numbers.
6-112
6-113
11-128
6-115
5-122
6-111
6-118
These are while accelerating from various speeds.
Basically i am seeing if these are normal or if it shows a problem.
Old Jul 26, 2007 | 10:07 PM
  #2  
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What is that supposed to be? BLMs?

Really, it is virtually impossible to tell anything too meaningful from static data. A log is what is needed.
Old Jul 26, 2007 | 10:51 PM
  #3  
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You need to look at how the BLM's change over time. It takes a while before they stabilize. I'd suspect you may have cleared the PCM before the data log, and that would explain why Cell 11 still reads 128.... it just hasn't been driven in long enough to be pulled down like 6. The fact that Cell 6 is moving aroung says its not spent enough time operating in that cell to stabilize. You also have to be careful that you are not reading data frames where the Cell # has just changed from a different number cell. In those "transition" frames the intial value of the new cell will be an interpolation of the previous and new cell BLM values.

In general, its not a good idea to reset the PCM before a data log, since it erases the BLM's and requires a bit of driving in all cells before they reach a stable reading.

As Shoebox points out, you can't tell much of anything from the random data, except that Cell 6 may to be pulling out up to 13% of the standard fuel calculation to correct a perceived rich condition. If that is what's happening, it may indicate a problem with the tune... or the sensors.... or some other problem.
Old Jul 28, 2007 | 10:19 PM
  #4  
mrmint69's Avatar
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The car hasn't been touched in any way. No reset or power disconnected. It almost seems like the computer is resetting itself or losing power randomly.
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