Volkswagen Front Wheel Drive 1974-1989 Repair Guide

Air Cleaner

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A restrictive, dirty air cleaner filter will cause a reduction in fuel economy and performance and an increase in emissions. The air filter should be replaced according to the maintenance interval chart in this Section, or more often in dusty conditions.

On gasoline engines with CIS or CIS-E fuel injection, the air cleaner is mounted directly under the fuel distributor/airflow sensor assembly. When changing the filter on these engines, the lower portion of the air cleaner housing stays in place and the distributor/sensor assembly is lifted up away from the housing. It is not necessary to disconnect any fuel lines or wires.

On diesel engines, the air cleaner housing is mounted directly to the intake manifold for noise control and ease of maintenance.

REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4 and 5



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Fig. Fig. 1: Common type air cleaner and filter found on carbureted engines

  1. On models with CIS or CIS-E fuel injection, loosen the hose clamps to remove the rubber boot from the top of the airflow sensor.
  2.  
  3. On Digifant engines, loosen the clamp and remove the air duct from the air filter housing.
  4.  
  5. Unsnap the cover retaining clips, starting with the hardest ones to reach. The last clip released will be difficult to unsnap, so it should be the easiest to reach.
  6.  
  7. Lift the cover off and remove the air filter element. On CIS and CIS-E engines, lift the fuel distributor/airflow sensor assembly enough to remove the filter element.
  8.  



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Fig. Fig. 2: The diesel air filter is mounted directly on the intake manifold



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Fig. Fig. 3: The air cleaner cover is usually secured by several retaining clips

  1. With the paper side down, drop the element just a few inches repeatedly on a flat surface to shake out any loose dirt, then examine the element. On CIS and CIS-E engines, there may be fuel stains on the element. Dry stains are not a problem but if the element is wet with fuel, the fuel distributor is probably leaking.
  2.  
  3. Wipe out the housing and install the new element. Make sure the rubber seal fits properly into the groove in the housing.
  4.  
  5. Replace the cover and secure the clips, starting with the least accessible clip.
  6.  
  7. When installing the boot on the CIS or CIS-E airflow sensor, make sure the boot is fully seated all the way around the lip before tightening the clamp.
  8.  



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Fig. Fig. 4: On CIS and CIS-E engines, lift the fuel distributor/airflow sensor assembly enough to remove the filter element



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Fig. Fig. 5: Inspect the air filter and clean the housing of any debris. If necessary, replace the air filter

 
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