Audi 80 Quiz
MPI and MPFI Injection Systems

Idle speed control valve

In this manual: MPI and MPFI Injection Systems
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

MPI only

The idle speed control valve on the 2.8L engine is located on the right side of the throttle body. Check it as follows:

PROCEDURE

Disconnect the idle speed control valve connector and connect a precision ohmmeter to both valve terminals.

The meter should read 7—11 Ω. If not, the valve is faulty.

Further functional check: Remove the idle speed control valve; the connector remains connected. Move the rotating plunger in the air passage opening of the valve to the "open" or "closed" position (do not use metal tools!).

Turn the ignition on and observe the rotating plunger: it should move to approximately the middle position.

Check that the rotating plunger moves freely: it can be moved by briefly turning the removed valve.

In addition, the plunger must show no signs of friction or grooves.

Test yourself

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