car wont idle and will stall after battery disconnected

2002 LEXUS ES 300
152,000 MILES
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LU4COR23
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  • 1 POST
went to disconnect neg battery cable, went back to connect it, car will start, but will not idle.. I've driven it about 10-15 miles to try computer relearn procedures.., and i've tried touching the battery terminals together.. worked for a little but then car died.
Feb 4, 2012 at 11:57 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Check the idle air control valve and also scan the computer for code/s
Feb 5, 2012 at 12:14 AM
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OXAMANDUHX
  • MEMBER
  • 11 POSTS
You will need to do the IDLE RELEARN. Basically you start it and keep the RPMs over 1500 for a while then go drive it for 20 min above 55 to 60
Feb 8, 2012 at 9:13 PM
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KHLOW2008
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  • 41,814 POSTS
  • ASE Certified Mechanic
When air passages for the idling system are clogged, disconnecting the battery would cause stalling.

Relearning is required but cleaning the idle control system would eliminate the stalling even while it is relearning.
Feb 9, 2012 at 9:50 PM
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