Adjusting the idle speed
Idle speed is adjusted in the same way as on carburetor engines. The adjusting screw is located on the rear side of the throttle body near the intake manifold (figure B:25).
NOTE: If the fuel injector lines were disconnected, the engine must run for at least one minute at 3000 rpm and at least two minutes at idle before beginning adjustments.
Adjusting the mixture composition (cO content) in idle mode
The information is posted on this resource [VWMANUAL.ru]
Start adjusting the mixture composition after adjusting the idle speed and fulfilling the prerequisites listed above.
NOTE: If equipped with an Idle Speed Module (DIS), it must be disconnected and the wires shorted as described above. Using a gas analyzer when adjusting the air/fuel ratio is MANDATORY.
Run the engine at 3000 rpm for two minutes, then set the engine to idle and check the CO content on the gas analyzer. Record the gas analyzer readings and compare with the value given in the section "Technical data". If adjustment is necessary, remove the plug (B, figure B:26) from the hole between the plastic air duct and the fuel distributor housing and using a long 3 mm Allen key (A, figure B:26) turn the adjusting screw. To increase the CO content, turn the screw clockwise, and to decrease it, turn it counterclockwise. Do NOT lift or press the screw while making adjustments. Remove the key.
ATTENTION! After each adjustment, it is necessary to IMMEDIATELY REMOVE the Allen key and increase the engine speed by briefly pressing the accelerator pedal. Failure to remove the key in a timely manner will cause damage to the internal parts of the air flow sensor.
After completing the adjustment, reinstall the plug. Connect the DIS idle speed module (if available) and check the idle speed.
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