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Unsteady Engine and White Smoke in Audi A4: HPFP or Injector Failure?
Summary of the thread
An Audi A4 is experiencing an unsteady engine and excessive white smoke, with diesel pooling near the high-pressure fuel pump (HPFP) and exhaust tips. A diagnostic code indicates a fuel pressure regulator issue, suggesting a potential HPFP leak or failure. The problem could also stem from malfunctioning fuel injectors. It is advised to inspect the HPFP for leaks or damage and check the injectors for any issues.
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AUDI
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A4
CarlyMechanic
Start by inspecting the high-pressure fuel pump (HPFP) for any visible leaks or damage, as a leaking HPFP can cause diesel to pool and lead to unsteady engine performance. Check the connections and seals around the HPFP for any signs of wear or damage. If the HPFP appears intact, consider inspecting the fuel injectors for leaks or malfunctions, as they could also contribute to the symptoms you're experiencing. Let me know how the inspection goes or if you have any further questions.