What are the symptoms of a faulty high-pressure fuel pump in the Tiguan?
2 Answers
Tiguan high-pressure fuel pump failure symptoms include severe shaking, weak acceleration, unstable idle, and difficulty starting. Below are the relevant details: 1. High-pressure fuel pump: It is an additional fuel pump for direct injection engines, but unlike ordinary fuel pumps installed inside the fuel tank and driven electronically, the high-pressure fuel pump is purely mechanically driven (by the camshaft). 2. Probability: Both ordinary fuel pumps and high-pressure fuel pumps can fail, but the probability of failure is not high. Moreover, with proper use, they can last over 100,000 kilometers without any issues. Once a failure occurs, it generally requires a complete replacement.
I've been driving my Tiguan for several years, and when the high-pressure fuel pump failed last time, it was really a hassle. First, the most common symptom: the car was particularly difficult to start, with several failed ignition attempts—it felt like the fuel wasn't being supplied properly. After starting, the engine would make a strange knocking noise, somewhat like metal rubbing, especially noticeable at low speeds. Driving was even worse; the car would jerk noticeably during acceleration, with a significant loss of power, struggling even on small inclines. Additionally, fuel consumption inexplicably increased a lot—city driving, which used to average 10 liters per 100 km, jumped to over 12. If ignored, warning lights might appear later, such as the engine fault light on the dashboard flashing continuously. Once these symptoms appear, it's crucial to get it checked immediately, or else not only could the engine be damaged, but safety could also be compromised.
