volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Air Flow Sensor Potentiometer, Checking and Adjusting|Page 4756 > < Air Flow Sensor Potentiometer, Checking and Adjusting|Page 4754
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distance "a"

=

0.6 mm between stop screw and collar of hex hut

1/4 turn

=

approx. 1.3 mm of play at sensor plate

turning in

=

increases free play

turning out

=

decreases free play

After free play adjustment is completed

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.

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

must be 21.3 ± 0.1 mm*

*  After adjusting CO content to specifications (via control current), this dimension no longer applies.

Control plunger, removing

mark position of stop screw by scribing

- measure and record distance "a" between stop screw and hex nut collar

remove stop screw using VW 674/2 wrench

Control plunger, Installing

-

wash control plunger with clean gasoline before installing

-

inspect stop screw sealing ring for damage, replace if necessary

install with smaller diameter 0 of sealing ring towards control plunger

Air Flow Sensor Potentiometer, Checking and Adjusting|Page 4756 > < Air Flow Sensor Potentiometer, Checking and Adjusting|Page 4754