In late autumn, when the temperature increasingly drops to just a few degrees Celsius, owners of diesel Audi cars should pay a little more attention to engine maintenance. True, although TDI engines are designed for operation in the cold season, some specific shortcomings in their operation usually become apparent precisely with the approach of winter and greater frosts. In the mornings, the car may have a little more difficulty starting, and during short trips the engine sometimes does not even have time to reach operating temperature. Of course, such changes do not necessarily mean some kind of malfunction, but they may indicate that certain components are already worn out. LLLParts specialists recommend checking several key diesel engine systems before the first frosts and higher humidity, especially if the car has been used for several years or much longer.
Glow plugs and battery – where to start?
One of the most common cold-weather complaints is that the engine is harder to start. The glow plugs in diesel Audis help ensure the right conditions for the fuel to ignite, so their condition matters most in cold weather. For example, in much older Audi A4s with 2.0 TDI engines, one malfunctioning glow plug may have almost no effect on starting in the summer, but by the end of November the situation may be completely reversed.
However, before changing the plugs, you should make sure that the problem is really related to the plugs. A diesel engine requires sufficient starter rotation speed, and a weak battery may no longer be able to provide this feature in cold weather. In addition, in cars driven over short distances, the battery does not always have time to recover the energy used for starting thanks to the generator. LLLParts specialists advise checking its condition and performing diagnostics of the heating system. Sometimes this is enough to identify the real problem, which makes finding a solution much easier.
Fuel filter: a small detail whose condition is important in winter
It is no secret that the high-pressure fuel supply systems used in Audi TDI engines are very sensitive to dirt, so fuel filter maintenance should not be postponed. Additional circumstances arise in the cold season. When diesel reaches a sufficiently low temperature, paraffin crystals begin to form in it, which can make it difficult for the fuel to pass through the fuel filter itself. Winter diesel is adapted to such conditions, but summer fuel remaining in the tank before severe frosts can really cause quite a few problems.
Therefore, in late autumn, it is worth remembering when the fuel filter was last changed. If its replacement deadline is approaching, it is better to do this work without waiting for winter. By the way, even Audi A6 models of the same generation may use different fuel system components, depending on the engine modification. For this reason, it is important to choose original parts based on the technical data of a specific car, and not just the model name.
You can find the original Audi parts you need for the winter season here: https://www.lllparts.co.uk/audi-parts
