Steve Weiner-Rennsport Systems

Hi Glenn,

First,...there truly is no such thing as a "stupid question". The only ones that are really stupid are the ones that are never asked.

In some cases, the MAF loses calibration when the battery is disconnected and it requires adaptation after the battery is reconnected. Its a simple procedure but can be avoided by keeping minimal power on the car with that 9v battery.

AX993

Steve,
I've recently had my battery out for almost a week while doing the A/C evaporator. In what cases would the MAF lose calibration (and how would I know if it did), and what is the procedure to perform MAF adaptation (or is it in the workshop manuals)?
Thanks,
Glenn

Slow Guy

Uh, Steve, can you elaborate on the calibration issue a little further? As part of the work I was going to do (pull front bumper to replace both resistors, replace fender gaskets ect.). I was going to clean the MAF w/ CRC MAF Sensor Cleaner. I would assume this would cause it to loose calibration.

As for the 9v tool, I have one that plugs into the cig lighter but since resetting the readiness codes hasn't been an issue for me on this car using the BMW Drive Cycle the only thing it would buy me is saving the radio station pre-sets .