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Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: Lexus
Satisfied Customers: 22405
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Ok I have 2001 lexus rx 300 and I replaced aletenator and

Customer Question

ok I have 2001 lexus rx 300 and I replaced aletenator and battery now when it sits its hard to keep running until I rev it up to 2000 rpm for about 5 minutes then run ok
JA: Have you tested the battery? Is the battery fluid low?
Customer: brand new
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: nothing
JA: Anything else you think the mechanic should know?
Customer: very low idile runs a little rough not to bad has 200,000 miles on it
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Lexus Mechanic about your situation and then connect you two.
Submitted: 10 months ago.
Category: Lexus
Expert:  Tim Mohr replied 10 months ago.

Hi, my name is ***** ***** far have you driven it since you replaced the battery?

Customer: replied 10 months ago.
Couple miles
Customer: replied 10 months ago.
When it's warm seem to run ok
Customer: replied 10 months ago.
My neighbor replaced battery and altenator cause I am in wheel chair
Expert:  Tim Mohr replied 10 months ago.

when the battery is disconnected, the computer loses its adaptive memory, for the idle control and needs to relearn the settings, this take s a few driving cycles for the idle to return to normal, I have seen it take 3 or 4 driving cycle to relearn the adaptives, was it idling normal before replacing the battery?

Expert:  Tim Mohr replied 10 months ago.

I cannot make a phone call, your credit card was declined???

Customer: replied 10 months ago.
Sorry I don't have available credit card cause friday someone hacked my account they are sending new ones
Expert:  Tim Mohr replied 10 months ago.

how did you make the deposit?

Customer: replied 10 months ago.
With a gift card only had ten dollars on it won't get credit card for another 10 days
Expert:  Tim Mohr replied 10 months ago.

it will be impossible to help you until you get your credit card,Tim

Customer: replied 10 months ago.
Ok don't have another credit card
Expert:  sprinkles08 replied 10 months ago.

Hello and welcome to JustAnswer!

If it idled fine before the battery was disconnected then the problem is indeed most likely with idle air control memory. in some cases a scan tool is needed to reset memory and allow it to idle correctly.

Is the problem still present now?