Audi 80 Quiz
Ignition System

Electrode gap

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 air-fuel mixture and combustion products have a corrosive effect on the metal electrodes of spark plugs. High voltage during spark discharge erodes metal particles, so the electrode gap increases in service. The following electrode gap values are permissible:

4- and 5-cylinder engines: 0.7–0.9 mm
6-cylinder engines: 0.9–1.1 mm
With the three-electrode spark plugs used in the Audi 80, the spark will select the shortest spark gap on its own. Therefore, it is unlikely that the electrode will need to be bent.

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