After car battery change, problem when Idling??? - Toyota RAV4 Forums
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#1 (permalink) Old 10-08-2009, 09:17 AM
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After car battery change, problem when Idling???

After i change my car battery, when idling it feel worst, something like 500rpm.. izzit anyproblem? or after change battery did i need to leave it engine start for certain time then only can drive?

Thank you

Toyota Rav4.3 2AZ-FE + Turbocharger (7 Speed auto)
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#2 (permalink) Old 10-08-2009, 10:31 PM
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It is a problem. When the battery is replaced, the engine should idle normally without any need to wait a certain time.

Do you have an aftermarket fuel controller? Maybe it lost its memory while the battery was disconnected.
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#3 (permalink) Old 10-08-2009, 10:49 PM
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Its normal the ECU just reseted to factory settings.
Drive for a few days it'll go back to normal.
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#4 (permalink) Old 10-10-2009, 10:06 AM
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Quote:
Originally Posted by Kurz
Its normal the ECU just reseted to factory settings.
Drive for a few days it'll go back to normal.
thanks for the replies. the first time i change the battery, few days later problem solved automatically. 2nd times i remove the battery for welding work, the idling become worst which around 500rpm when i install back the battery, but after few day it become normal back.
so i assume it was normal i think

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#5 (permalink) Old 10-10-2009, 12:50 PM
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That's good to know. I assumed that it was not normal because my previous car, a Toyota Corolla, always idled perfectly immediately after replacing the battery.
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#6 (permalink) Old 10-13-2009, 02:42 AM
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I had a mishap with my Throttle Body (Jammed the Throttle plate with finger threw a code)made a thread and video about it.

After cleaning the throttle body the Engine was idling weird (Reving high).
So I did the whole 1 hour disconnect battery to reset the computer.
Except this time the idle was perfectly normal no really low idle.

The reason I cleaned the throttle body was mostly because of that horrible low idle when I replaced the battery earlier this year.
I thought to myself the throttle body must be dirty for the computer to not allow enough air to keep a proper idle after reset.

Btw if the idle is that low I suggest you clean the Throttle body.
Sounds your throttle body might be dirtied up.
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#7 (permalink) Old 10-15-2009, 04:56 AM
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Thank you for the suggestion, i try remove the trottle body and clean it

Toyota Rav4.3 2AZ-FE + Turbocharger (7 Speed auto)
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#8 (permalink) Old 10-16-2009, 12:35 AM
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Quote:
Originally Posted by pioneer411
Thank you for the suggestion, i try remove the trottle body and clean it
If you do it the easy way (having someone hold down the Accelerator) Make sure they are reliable... I had the notion I could have my teenage brother do it.

Or get a weight.
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#9 (permalink) Old 09-29-2010, 06:39 PM
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When you disconnect the battery after certain period of time, you will lose all the parameters in the ECU. You need to drive it for xxx of miles so the ECU can go through a few cycles to relearn all the parameters.
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#10 (permalink) Old 06-24-2012, 12:28 PM
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thanks for the great information. after xxxkm it all ok,. and i clean the throttle too, problem solve

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