Quote:
Originally Posted by mkguitar
for us 2000's Chevy owners, disconnecting the vehicle battery for an extended period will "reset" the ECM computer.
the vehicle will run rough and not maintain idle until it has gathered new data based on start/stop cycles and temperatures
This does not appear to be harmful, but can be disconcerting to the driver
on my van I have a battery tender on a timer which comes on every night
on my rarely used 72 Eldo I have a harbor freight solar cell which keeps it topped up.
the solar doesn't have a regulator- but 4 years of use and measurements show that the higher 18~20 volt, low current at about 150mA are ok for the AGM battery
Mike
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Try letting it idle for 5-10 minutes after a battery disconnect and you probably won't see any noticeable oddities when you drive it afterwards. Most of the vehicles are "learning" what the fuel is compared to the base fuel map settings in the PCM. It will run the mixture up and down a few times and see where the stoich point is with the O2 sensors and put a correction on the mixture control to match the fuel.
They do this all the time you are driving it also, at idle for the most part IIRC, to keep up with what fuel is being used. Most of the time, the fuels are close together so not noticeable, but it can be way off when starting from baseline because of no battery. It can take much long than the 5-1 minutes if you are driving because you aren't at idle much.
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