Volkswagen Golf/Jetta 2 manual

Airflow sensor plate and control plunger - testing
Fuel and exhaust systems - K-Jetronic fuel injection - 8 valve engines / Airflow sensor plate and control plunger - testing


1 For the correct mixture to be supplied to the engine, it is essential that the sensor plate is central in the venturi and that its height is correct. First run the engine for a period of about one minute.

2 Loosen the hose clips at each end of the air scoop and remove the scoop. If the sensor plate appears to be off-centre, loosen its centre screw and carefully run a 0.10 mm feeler blade round the edge of the plate to centralise it, then re-tighten the bolt (see illustration).

14.2 Top view of airflow sensor plate
14.2 Top view of airflow sensor plate

3 Raise the airflow sensor plate and then quickly move it to its rest position. No resistance should be felt on the downward movement. If there is resistance, the airflow meter is defective and a new one must be fitted.

4 If the sensor plate can be moved downwards easily but has a strong resistance to upward movement, the control plunger is sticking. Remove the fuel distributor and clean the control plunger in fuel. If this does not cure the problem, a new fuel distributor must be fitted .

5 Release the pressure on the fuel distributor and then check the rest position of the airflow sensor plate. The upper edge of the plate should be flush with the bottom edge of the air cone (see illustration). It is permissible for the plate to be lower than the edge by not more than 0.5 mm but if higher, or lower than the permissible limit, the plate must be adjusted.

14.5 Sensor plate position requirement
14.5 Sensor plate position requirement

Upper edge of plate (arrowed) must be flush with bottom of air cone

6 Adjust the height of the plate by lifting it and bending the wire clips attaching the plate to the balance arm. Take care not to scratch or damage the surface of the air cone (see illustration).

14.6 Airflow sensor plate adjustment clip (arrowed)
14.6 Airflow sensor plate adjustment clip (arrowed)

7 After adjustment, tighten the warm-up valve union and check the idle speed and CO content.


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