Just Wondering No Volts

[metalchips]

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. Is it worth the bother to keep current flow via a jumper battery when switching out batteries?

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.

[foggy]

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

[GasGuzzler]

+1

[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.

[GasGuzzler]

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

[metalchips]

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.

Thanks -- will do the spare battery.