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While idling, my 5 speed, standard, 1

Tiny
ANONYMOUS
  • MEMBER
  • 1999 VOLKSWAGEN PASSAT
  • 130,000 MILES
While idling, my 5 speed, standard, 1.8L rpm's varies about 150rpm. Ever since I disconnected the battery, and replaced the ignition switch. Do I need to reset something.
Monday, October 29th, 2012 AT 1:17 AM

2 Replies

Tiny
EXOVCDS
  • MECHANIC
  • 1,883 POSTS
The ECM lost its "learned" idle setting... it will re-learn on its own or use a scan tool to run a Throttle Adaptation.

I have a video where I cleaned the throttle & ran the adaptation on a 1.8T Jetta:

http://www.youtube.com/watch?v=OAfeBLENkfA&feature=plcp

Thomas
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Monday, October 29th, 2012 AT 1:26 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Disconnecting battery causes the computer to lose memories -you need to the drive vehicle to enable ECM to relearn driveability.
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Monday, October 29th, 2012 AT 1:32 AM

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