PCV Valve... Battery Disconnect?

[Wolfman213]

I'll be picking up a PCV Valve today. Honestly don't know what they do but they seem simple to replace and I've never replaced it so I figured why not. My question is, should I disconnect the battery when replacing it in order for the computer to relearn everything with a fresh PCV valve?

[joatmon]

I wouldn't bother, I wouldn't expect the computer to notice either way.

PCV valves are simple mechanical valves with no external controls, it allows the intake to suck air out of the inside of the engine, but keeps anything from blowing back into the engine from the outside. This provides Positive Crankcase Ventilation (PCV) to take any combustion gases that escape past the rings to be recycled back into the intake and reburned. Also puts a minor vacuum on the crankcase, keeps ring blowby from building pressure in the engine internals and blowing out some critical seal somewhere

[Salsa Guy]

It's always good practice to disconnect the battery for safety reason when working on a car. But for the ECU to re-learn a new PCV Valve...NO! It may hurt you more in the short term than help.

[Wolfman213]

Thanks all!! Good explanation of what it does joatman. It was supposed to be in today, but now I won't get it till tomorrow. Simple replace and at least I know not to disconnect the battery now lol.