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Golf Mk4

Cleaning throttle valve moduleJ338
Cleaning throttle valve module -J338-
  Note
t  If a new engine control unit is installed the throttle valve module -J338- must be adapted. Adaptation must be performed only with a new or cleaned throttle valve module, because soiling or coking at the end stop of the throttle valve can lead to incorrect adaptation values.
t  When cleaning the throttle valve housing it must not be scratched.
–  Remove intake manifold → Item.
–  Remove throttle valve module -J338-.
   
–  Open throttle valve by hand and lock in open position using a suitable object (e.g. wood or plastic wedge) -arrow-.
  WARNING
Acetone is highly inflammable. Please observe the accidental regulations and safety notes when handling with highly inflammable fluids. Do not use compressed air when cleaning the throttle valve. Wear eye protection and protective clothing to avoid possible injury and skin contact.
  N24-10125
–  Thoroughly clean throttle valve housing, especially around the closed throttle valve -arrows- using commercially available acetone according to DIN 53247 and a cleaning brush.
–  Wipe off throttle valve housing using a lint-free cloth.
–  Wait until the acetone is fully evaporated and reinstall the cleaned throttle valve module -J338-.
–  Adapt the engine control unit to throttle valve module -J338- → Vehicle diagnostic, testing and information system VAS 5051.
  N24-10124

Removing and installing injectors > < Assembly overview - air filter