low ideling after changing alternator

[dennis_ru]

just like to thank everyon in advance with any responses,
i have 2008 camry, i just changed the alternator, so the battery was disconected, and now the car has very low idling under 500-450 rps, somone told me that the computer got restarted and needs some time to program itself again, i drove it on the highway and some city driving, but it doesnot seem to help, does anyone know if there is sp,e procedure i shold follow to have this cmu programmed as it was, this is myfirst toyota, i dont know much about them. thanks

[fatngs]

how long ago since u hooked up the battery? my car takes a day or two to idle properly after i disconnect the battery for an extended period of time

[karbonfyber]

Did you let it sit and idle for 20-30 minutes?

[dennis_ru]

it was more than one day ago, i didnt let it idle, i took on the road fo 11 miles each way, should i give it more time?

[Mcglry]

Yes. Let it idle awhile. It will take a long time. Same thing happened in my 04 Camry. Try holding down the brake and putting it into neutral for a little bit too.

[magnate]

Yeah let it idle for at least 1 hour or drive for more than 30 miles it should be fin because it happened with me for camry 2003.

[FireLikeIYA]

Why did you change your alternator?

It usually takes around 100-150miles for the computer to relearn.

[Kycamrymaker]

http://www.v6z24.com/howto/idlerelearn
This is what everybody does at work and it seems to work for them, I dunno as I have never tried it but it seems plausible to me. Good luck and let us know.

[dennis_ru]

the alternator was making a knocking noise, my camry would sound like a disel truck or something, at first i thought something was wrong with the engine, but after checking it i found it was coming from the alternator. it took about 60 miles to get to normal idling, i also let it idle for 15-20 minutes, runs very smooth now.

[athousandleaves]

Sounds to me like your car is idling at a healthier range because it was working a lot harder to get the voltage it needed out of the alternator before...

Check the idle speed when the engine is warmed up with the car in neutral and you might see it up around 600 rpms.

Double check all the connections you made to your alternator & belt tension too.

[Kevinmai712]

Same thing happen to me in my 2007 Toyota Camry SE, this Texas heat has been killing my battery so when I went and replace it with a new one the car started to idle rough. Like what Dennis said between 500-450 rpm so i guess its normal to let the computer relearn itself... But its taking so long

[molson.david]

But its taking so long

I cleaned throttle body some time ago.
after I started the car RPM went up to almost 1500RPM.
took about 5-7min + 3-5 miles for my car to come back to normal idling.

I've read that after disconnecting battery RPM getting unstable because ECU looses info on normal position of the throttle body.
in cars with throttle by wire it need to be reprogramed.
you can reprogram it by turning ignition ON (do not start) and slowly pressing accelerator pedal to floor and back couple times.
never done it myself, but read about it on acura and some other forums.