Golf GTI L4-1984cc 2.0L DOHC (9A) (1990)
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Throttle Body: Adjustments
Idle Air Bypass Screw
The Idle Air Bypass Screw on all 2.0L 16v CIS-E Motronic engines is not used to adjust idle speed. The idle speed is controlled completely by the idle
stabilizer valve and the Motronic control unit. Therefore, the Idle Air Bypass Screw should be turned all the way in to its stop and left there, do not use it
for adjusting idle speed.
