Question about 1988 Audi 90
Electronic fuel pumps hum. That's pretty normal. It's always a good idea to periodically replace the filter.
First, check your battery cables. Are they frayed? Are they corroded? Are they loose - both where they connect to the battery and where they connect to the block (negative cable) and starter (positive cable)?
If the battery cables check out, have your ignition system and charging system (which includes your alternator and belts) tested by a mechanic.
If these check out, have your vacuum system tested for backpressure or low pressure.
Posted on Oct 08, 2009
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Posted on Jan 02, 2017
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