Audi 80 Quiz
Ignition System

Spark plug replacement

In this manual: Ignition 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

The maintenance schedule calls for spark plug replacement every 30,000 km. This interval is realistic, and it is not recommended to extend it. Carefully monitor the condition of the ignition system, especially on vehicles equipped with a catalytic converter, as noted earlier. Still, take a close look at the removed spark plugs: the following describes what the deposits on a spark plug can tell you.


Note: if you removed the spark plugs for inspection between replacement intervals, do not clean them by hand. This will damage the insulating layer (steatite) of the spark plug center electrode. However, you can check the electrode gap.

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