Postby smj999smj » Wed Jan 17, 2018 2:58 am
If they reprogrammed the ECM with updated software, there is nothing you can do. The only way to go back to the old program is to have the ECM reprogrammed to the previous software program. To have the ECM go back to the base settings, you can disconnect the battery for a period, but this may erase the idle air volume memory and an idle air volume relearn may be needed afterwards.