This should not be affecting your pulsewidth. You have an issue somewhere. Thats not your Wideband then.

If you have a digital meter, set to record and record the voltage at the battery. Compare the meter to the MS realtime display or datalog.

You may have some sort of ground issue in your MS. You should be grounding your harness right at the battery or the chassis ground right by the battery. You do not want to let the MS case touch the cars chassis either. That has caused ground noise in a few members cars.

Now that you mention that i see in your datalog where it is affecting the other sensors which is affecting your PW. YOu have some sort of ground issue. Open your MS up and see if there is flux all over the board. YOu will see what apears to be a hard clear paste around the solder joints. I saw a few that were made by someone else on this baord and they were not cleaned at all. Flux can cause a lot of issues.

Terry