Just Wondering No Volts

I am due to replace my original 6 1/2 years GM battery. Cranks slow when the battery is cold.

Question is what does the PCM lose and have to relearn when the battery is disconnected? I have a tune and is running good. :burnrub:Is it worth the bother to keep current flow via a jumper battery when switching out batteries?

:doofus: I know I could fry things if not careful.


On a second note, looking at getting a "Optima battery "--cost little more ----weighs more at 38.8 lbs----but would be nice to remote install in the back. Any body using one???

Thank you for your time and consideration.
:whack::jump: :cowl:

You won't lose anything. Just swap them out.

+1

You will lose what the PCM learned beyone the base tune. I've seen guy use a device you plug into the cigarette lighter to keep the memory active. A small 9v battery plugged into it will hold the memory for 15 minutes or so. You could use a spare 12v battery to provide voltage while you're swapping batteries.

ST and LT as well as average injector PWM, etc. will go but the tune won't.

Quote:

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Originally Posted by RedHeartbeat

You will lose what the PCM learned beyone the base tune. I've seen guy use a device you plug into the cigarette lighter to keep the memory active. A small 9v battery plugged into it will hold the memory for 15 minutes or so. You could use a spare 12v battery to provide voltage while you're swapping batteries.

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Quote:

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Originally Posted by GasGuzzler

ST and LT as well as average injector PWM, etc. will go but the tune won't.

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Thanks -- will do the spare battery.:beerchug: