What are the faults when the throttle valve of a diesel vehicle is broken?
2 Answers
When the throttle valve of a diesel vehicle is damaged, the following faults may occur: 1. Unstable flow: After the throttle valve or one-way throttle valve is adjusted and locked, sometimes the flow may become unstable, especially at the minimum stable flow. The main causes of unstable flow include loosening of the locking device, partial blockage of the throttle port, rising oil temperature, and changes in load pressure. 2. Increased leakage: When the throttle port of the throttle valve or one-way throttle valve is closed, there will inevitably be some leakage due to the gap sealing, so the throttle valve or one-way throttle valve cannot be used as a shut-off valve. When the sealing surface is excessively worn, it may lead to increased leakage, sometimes also affecting the minimum stable flow. In such cases, the valve core should be replaced.
Our veteran fleet drivers all know that diesel throttle issues can be quite troublesome. My long-haul diesel pickup once had this problem - the engine shook violently like it was falling apart during cold starts, with thick black smoke pouring from the exhaust. When accelerating on highways, it felt like stepping on cotton, with the speed stubbornly refusing to increase. The scariest moment was when it suddenly lost power while climbing hills, with the tachometer jumping erratically and warning lights glaring. A diagnostic scan at the repair shop confirmed the throttle position sensor was malfunctioning, with the valve stuck midway. The mechanic later found carbon deposits as thick as fingernails during disassembly, and the EGR valve was completely clogged too. A word to fellow diesel owners: if you notice sluggish acceleration or unstable idling, don't push your luck - get it checked early to save yourself bigger headaches.
