2009 Toyota Camry idle

Tiny
DASBMS
  • MEMBER
  • 2009 TOYOTA CAMRY
  • 4 CYL
  • 2WD
  • MANUAL
  • 130,000 MILES
I removed and replaced the battery, after that the idle is now rough.
Monday, October 27th, 2014 AT 8:21 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
If that's all you did, the Engine Computer needs to relearn something, and that is done when certain conditions are met during normal driving. The only one I have memorized is an idle speed that's too low on Chrysler products. The relearn that always solves that takes place when driving at highway speed with the engine warmed up, then coasting for at least seven seconds without touching the pedals. I have not heard of anything like this on other brands of vehicles, so I suspect yours will clear up shortly.

Fuel trim data was lost too when the battery was disconnected, but that information is typically relearned very quickly without you even noticing a performance issue.
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Monday, October 27th, 2014 AT 10:03 PM

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