Passat L4-1984cc 2.0L DOHC (9A) (1990)
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distance "a"
=
0.6 mm between stop screw and collar of hex hut
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1/4 turn
=
approx. 1.3 mm of play at sensor plate
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turning in
=
increases free play
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turning out
=
decreases free play
After free play adjustment is completed
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re-check free play adjustment, if necessary adjust CO content via control current adjustment
Sensor plate lever, basic adjustment
NOTE: The basic adjustment should only be performed if the fuel distributor or air flow sensor have been replaced.
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measure distance between the air flow sensor housing opening (for the fuel distributor) and the sensor plate lever roller, if necessary adjust using
CO adjusting screw
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must be 21.3 ± 0.1 mm*
* After adjusting CO content to specifications (via control current), this dimension no longer applies.
Control plunger, removing
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mark position of stop screw by scribing
- measure and record distance "a" between stop screw and hex nut collar
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remove stop screw using VW 674/2 wrench
Control plunger, Installing
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wash control plunger with clean gasoline before installing
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inspect stop screw sealing ring for damage, replace if necessary
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install with smaller diameter 0 of sealing ring towards control plunger