1999 Volkswagen Passat While Idling 5 Speed Standard 1 8l Rpm S Varies About

1999 VOLKSWAGEN PASSAT
130,000 MILES
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ANONYMOUS
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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.
Oct 28, 2012 at 6:17 PM
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EXOVCDS
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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
Oct 28, 2012 at 6:26 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Disconnecting battery causes the computer to lose memories -you need to the drive vehicle to enable ECM to relearn driveability.
Oct 28, 2012 at 6:32 PM
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