Starting Time...

[Hog]

Originally Posted by Hib Halverson

Depends on what you mean by "power down".

If you mean, turn off the ignition, the answer is "Yes." for short term trim (ie: integrator) and "No." for long term trim (ie: block learn).

If you mean, turn off the ignition and disconnect the battery for at least 15 seconds, then yes, you loose all fuel trim information and you start from zero for both STFT and LTFT.

Also, just so we're all on the "same page", the above is true for all ZR-1s and any GM vehicle from 81-95.

Since powering down the ECM involves disconnecting its power source, AKA disconnecting the battery, that's what I was asking/pointing out. I was specifically quoting a post that said that powering down the car had no issues or something to that effect, and had pictures of a sidepost battery disconnect appliance.