1. Spark plugs:
- Worn or damaged spark plugs can prevent the engine from receiving the necessary spark to ignite the fuel-air mixture.
2. Ignition coils:
- Faulty ignition coils can fail to generate a strong enough spark or may not generate a spark at all.
3. Wires/connectors:
- Loose or damaged wires and connectors can disrupt the electrical circuit and prevent the spark plugs from receiving the necessary electrical current.
4. Distributor cap and rotor:
- In older Audi models with distributor-based ignition systems, a faulty distributor cap or rotor can disrupt the distribution of electrical current to the spark plugs.
5. Camshaft position sensor:
- A faulty camshaft position sensor can provide incorrect signals to the engine's control unit, which can affect the timing of the spark and fuel injection.
6. Crankshaft position sensor:
- Similarly, a faulty crankshaft position sensor can disrupt the engine's timing, affecting spark delivery.
7. Engine control module (ECM):
- In some cases, a malfunctioning ECM may fail to properly control the ignition system, leading to a lack of spark.
