Audi 80 Quiz
KE-III-Jetronic Injection System

Air Flow Sensor Test

In this manual: KE-III-Jetronic Injection System
Technical Description — 39Engines — 41Exhaust System — 13Cooling System — 28Fuel tank and fuel pump — 12Air Filter and Intake Ducts — 13Mono-Motronic Injection System — 18Digifant Injection System — 19KE-III-Jetronic Injection System — 35MPI and MPFI Injection Systems — 32Clutch — 11Transmission and Driveline — 21Suspension and Steering — 33Brake System — 41Anti-lock brake system — 8Wheels and Tires — 13Body Electrical System — 35Ignition System — 24Lighting — 14Signaling Devices — 7Instruments and Auxiliary Equipment — 54Heating and Ventilation — 7Body Components — 18Troubleshooting — 6Specifications — 13
~1min read

TEST PROCEDURE

Warm the engine to operating temperature, or run the warm engine for approx. 10 s before testing.

After loosening the clamps, remove the intake hose between the air flow sensor and the throttle valve housing.

Check the control plunger: on the side facing the injection line, it must be 1.9 mm below the upper edge of the narrow cylindrical section of the air horn, and no more than 3 mm deeper at most.

If the plunger is not positioned correctly, lift it up and adjust its position by bending the retaining wire bracket at the bottom in the air flow sensor channel. Do NOT bend the spring!
Now check whether the control plunger touches the walls.

If it does, loosen the central retaining screw and re-center the plunger.

After this adjustment, recheck the idle speed and CO content.

Test yourself

A quick Audi 80 quiz: every answer comes with an explanation and a link to the manual page.