Auxiliary air valve - testing

Fuel and exhaust systems - K-Jetronic fuel injection - 8 valve engines / Auxiliary air valve - testing

1 To carry out this test, the engine coolant temperature must be below 30°C.

2 Detach the distributor HT lead.

3 Detach the auxiliary air valve electrical plug and ensure that the contacts in the plug connector are in good condition (see illustration).

10.3 Auxiliary air valve (arrowed)

4 Connect up a voltmeter across the contacts of the plug connectors, start the engine and run at idle speed. The voltage reading must be a minimum of 11.6 V. If a voltmeter is not available, a test lamp will suffice to check the voltage supply.

5 With the auxiliary air valve electrical plug still detached, leave the engine running at idle speed and pinch the air inlet duct-to-auxiliary valve hose. The engine speed should drop.

6 When the engine is warmed up to normal operating temperature, reconnect the auxiliary valve plug then pinch the hose again. This time the engine speed should remain unaltered.