How long should I leave the battery disconnected to reset the Computer and clear its adaptive memory?

 

Disconnect the battery and turn the headlights on and that will clear the memory.

 

any time frame involved in that?

 

None that I am aware of. I've heard some say 20 minutes, some an hour but discharging the computer memory by turning on the headlights should take care of it right away. It's always worked for me.

 

Cool, I will give it a try, thanks!

 

Just curious, why would one need to reset it?

 

I had a period of running with a bad COP and old plugs. I am trying to reset my fuel economy and shift points based on the new parts I installed (plugs, COPS, etc) Now that the truck is running good just with very low MPG,s that I am assuming it learned bases on running poorly with the missing COPs and old spark plugs

 

Ive done this many times on many diff vehicles. 10 minutes unplugged doing nothing else has never failed to do the trick.

 

hmm didnt know about turning on the headlights. i know a trick for disabling the srs you touch the + and - terminals together to "discharge" it after disconnection.

 

hope somebody chimes in on this...I am also trying to reset the pcm... but how could turning on headlights with a negative terminal on battery disconnected drain the battery more if the lights obviously will not turn on because the negatives post terminal is disconnected.. am I missing something???