I am having problems with my timing dropping down to between 20 and 22 degrees with my naturally aspirated '01 A4 Z28. I also have a Yank PT-4400 converter. The timing has been set on LS1 Edit to 29 degrees in both octane tables.

My LS Edit tuner told me that he can't understand why the timing is being pulled back like it is. Is there possibly another table within LS1 Edit, possibly the HP vs. torque table, or somewhere else within Edit that something might have been missed and causing the computer to pull timing? I had my tuner lock the timing at 29 degrees at one point, and it stayed there. However, the bad thing about locking the timing is that it does not retard timing if there is knock sensed by the computer, which obviously could have adverse effect on the motor. Please see the two AutoTap logs listed below. This is killing my ET, and I'm stumped. Your thoughts are greatly appreciated.

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Engine Speed; Ignition Timing Adv; Knock Retard; TPS Voltage; O2 Sensor - B1S1; O2 Sensor -B2S1; Engine Coolant Temp

2056 37 0 1.1 0.055 0.035 187
2171 37.5 0 1.1 0.81 0.82 187
2213 34 0 1.5 0.085 0.12 187
2993 32.5 0 1.6 0.825 0.24 189
3184 32.5 0 1.6 0.185 0.525 189
3232 32.5 0 1.6 0.695 0.78 189
3210 20.5 0 4.6 0.87 0.85 189
4672 24.5 0.9 4.6 0.91 0.9 189
5310 27 0.8 4.6 0.915 0.89 189
5471 25 0.7 4.6 0.925 0.91 189
5940 27 0.6 4.6 0.92 0.905 189
6472 29 0.5 4.6 0.92 0.915 189
5610 22.5 0.4 4.6 0.935 0.93 189
5614 22 0.3 4.6 0.93 0.915 189
5729 22 0.2 4.6 0.94 0.93 189
5802 21.5 0.2 4.6 0.94 0.93 190
5882 22.5 0.1 4.6 0.925 0.93 190
5964 23.5 0 4.6 0.93 0.93 190
6046 22.5 0 4.6 0.92 0.92 190
6151 23.5 0 4.6 0.925 0.905 190
6282 26.5 0 4.6 0.925 0.92 190
6414 28 0 4.6 0.91 0.915 190
6563 29.5 0 4.6 0.92 0.905 190
6696 29.5 0 4.6 0.915 0.9 190
6809 29.5 0 4.6 0.09 0.825 190
6569 29.5 0 4.6 0.905 0.905 190
5778 20.5 0 4.6 0.915 0.91 190
5725 20.5 0 4.6 0.92 0.915 190
5745 20 0 4.6 0.925 0.92 190
5749 20 0 4.6 0.925 0.91 190
5794 20 0 4.6 0.92 0.915 190
5800 20.5 0 4.6 0.9 0.89 190
5830 20.5 0 4.6 0.905 0.91 190
5848 20.5 0 4.6 0.905 0.905 192
5862 20.5 0 4.6 0.91 0.905 192
5891 20.5 0 4.6 0.905 0.905 192
5910 20.5 0 4.6 0.905 0.92 192
5940 20.5 0 4.6 0.895 0.895 192
5959 20.5 0 4.6 0.895 0.895 192
5981 22 0 4.6 0.89 0.895 192
6007 20.5 0 4.6 0.885 0.905 192
6038 21 0 4.6 0.905 0.895 192
4982 40.5 0 0.6 0.905 0.86 192
4532 41 0 0.6 0.81 0.83 192
3586 41.5 0 0.6 0.755 0.8 192
3289 41.5 0 0.6 0.835 0.77 192
3244 41.5

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Engine Speed; O2 Sensor - B1S1; O2 Sensor - B2S1; Ignition Timing Adv; Knock Retard

2038 0.125 0.81 35 0
2780 0.88 0.84 32.5 0
3076 0.155 0.53 32 0
3297 0.175 0.74 32 0
3364 0.125 0.805 32 0
3391 0.135 0.59 32 0
3416 0.17 0.68 23 0
4132 0.93 0.905 27 2.6
5092 0.945 0.91 23 2.5
5381 0.955 0.915 21.5 2.3
5604 0.96 0.92 22.5 2.2
5827 0.95 0.94 23 2.1
6338 0.965 0.93 28 1.8
6417 0.955 0.93 25 1.8
5622 0.96 0.935 20.5 1.6
5614 0.96 0.935 20.5 1.6
5684 0.96 0.94 20 1.5
5720 0.97 0.94 20.5 1.4
5820 0.97 0.94 20 1.3
5884 0.97 0.935 19.5 1.3
5940 0.97 0.94 21.5 1.2
6041 0.955 0.935 22.5 1.1
6131 0.965 0.925 22.5 1.1
6781 0.93 0.92 29 0.7
6855 0.065 0.075 25 0.7
5917 0.93 0.925 19.5 0.6
5705 0.95 0.925 19.5 0.5
5712 0.935 0.745

<small>[ December 16, 2002, 11:24 PM: Message edited by: mmiller ]</small>

 

Now that is weird.. I just posted about this same thing. https://ls1tech.com/ubb/ultimatebb.p...;f=23;t=003439
I just had my air system andy rear O2 codes turned off today. It looks like you dropped 6-7 deg also. Did you do anything like I did? This is the first(and second) time I have ever heard of this. Maybe there is someone that can give expertise on this.
Later.

<small>[ December 17, 2002, 12:11 AM: Message edited by: BLUEBYU ]</small>

 

I think I'm going to clean the MAF frequency wires with a Q-Tip and some rubbing alcohol to make sure that they are perfectly clean. If they are dirty in any way this could explain the erratic readings on the O2's, timing, and also the fact that my tranny has been slipping on the 2-3 shift. BTW, I have a stock, de-screened MAF with stock MAF ends.

Thoughts?

 

Do you have any MAF values?

Richard <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

Update:

I cleaned the MAF frequence wires with rubbing alcohol and a few Q-Tips, and found them to be a little dirty. It doesn't take much dirt or residue being on the wires to make the computer's critical functions become erratic. I went out and Auto Tapped the car in my "private test spot". I couldn't ask for a more perfect run. O2's were around .890, timing was 29 to 30 degrees, the tranny shifted perfectly, and zero knock.

After I have made changes before with LS1 Edit, and Auto Tapped the car on the street, all has been well, so I'm not going to be convinced until I go to the track. I plan on going to HRP this Friday with my fingers crossed to hopefully confirm that the MAF frenquency wires being dirty was the problem.

 

I had a similar problem before. The car ran extremely rich O2's in the .940-.950 range and timing around 20 degrees. I cleaned the MAF wires with some spray contact cleaner and this solved the problem. After cleaning everything returned to optimal. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />