Originally Posted by
Blacky
The guys that designed FlashScan have been hard at work figuring out what can be done to limit external influences on the WB voltage as read by FlashScan.
The best solution is to use the RS232 serial link into FlashScan and get an exact digital wide band AFR value. The serial interface is being developed for the next major FlashScan firmware update. The LC1 will be the first wide band supported by FlashScan's RS232 interface.
The next best option is to return your FlashScan unit to EFILive. We can replace some of the components in FlashScan to higher specification parts. Parts with smaller errors and better resilliance against ground offset issues. These parts cost more but testing has shown that with the higher quality parts we can reduce ground voltage influences that can otherwise cause up to 50mV variance.
This upgrade is not free, but EFILive has decided to subsidise the upgrade and the final cost should be less than $20 (plus shipping).
I highly recommend getting this upgrade done. We will announce a formal upgrade procedure very soon on our web site.
Another option is to make sure all ground points are as resistance free as possible. Running a low resistance ground wire from the wide band directly to the battery negative terminal helps.
Lastly, some grounds change then the ignitions is switched on. What appears to be a goo dground with the igntion off can have a small voltage when the ignition is turned on and even more so when the engine is running and the alternator is charging. So when you are checking for ground issues, check under all three cases: Ignition off, Ignition on and Engine on.
Regards
Paul