Table of contents: Removal ↓ Air Filter Housing - Removal ↓
The air sucked in by the engine contains dust and other solid impurities, which, when entering the cylinder, lead to rapid wear of the pistons and their guides, acting as abrasive paper. To protect the engine, an air filter is used, which simultaneously acts as a noise absorber, reducing the noise level in the intake manifold.
Removal
Four-cylinder engines with Mopo-Motronic fuel injection system
1. Remove the two Phillips head screws on the top of the air cleaner cover (see illustration).
2. Release the latches on the air filter housing. The arrows indicate the recess on the edge of the cover and the protrusion on the filter housing
3. Remove the cover and take out the replaceable filter element.
When installing, remember that the notch on the edge of the cover must fit onto the protrusion on the filter body.
Four-cylinder engines with Digifant fuel injection system
4. Loosen the air intake hose clamp and disconnect the hose from the air filter.
5. Release the latches on the air filter housing.
6. Remove the cover and take out the replaceable filter element. The low pressure air supply hoses do not need to be disconnected (see illustration). The same procedure applies when removing the air filter on vehicles with diesel engines (see illustration 5.6a)
Five-cylinder engine
7. Loosen the air intake hose clamp on the air cleaner cover and remove the hose.
8. Press the two filter cover latches and remove the cover by pulling it upwards.
9. Remove the right side of the cover by removing the two Phillips head screws.
10. Remove the air intake above the air-fuel mixture regulator.
11. Release the five clips on the air filter housing.
12. Remove the air-fuel mixture regulator together with the upper part of the air filter by pulling them upwards.
13. Remove the air filter element.
Six-cylinder engines
14. Disconnect the air mass flow meter connector on 2.8L engines.
15. Loosen the air intake hose clamp and remove the hose.
16. Press the clips on the air filter housing.
17. Remove the cover and take out the air filter element.
Air Filter Housing - Removal
Engines with Mono-Jetronic fuel injection system
18. Remove the replacement air filter element (see above).
19. Unscrew the three nuts in the middle of the housing and, if present, remove the retaining ring.
20. Remove all hoses and remove the air filter housing (see illustration).
Attention! The low-pressure supply hose to the warm air flap on the air filter inlet pipe is attached to a brass connecting pipe or a pipe with a notch. The hose to the throttle valve is attached to a plastic pipe without a notch.
Four-cylinder engine with Digifant fuel injection system, five- and six-cylinder engines
21. Remove the air filter cover (together with the air-fuel mixture regulator) and remove the replacement filter element.
22. Disconnect the warm air hose from the heating unit.
23. Remove the hex bolt securing the lower part of the air filter housing.
24. Remove the air filter housing retaining sleeve from the rubber cuffs on the wheel arch.
25. Remove the air filter housing.
[Content source: the specified website: AudiManual.ru]