What causes diesel engine injectors not to spray fuel?
2 Answers
Here are the specific reasons why diesel engine injectors may not spray fuel: 1. Exhaust valve damage: There is usually an elastic exhaust valve on the valve cover. If the exhaust valve is damaged, engine oil may spray out from it. 2. One-way valve blockage or damage: If the one-way valve connected to vacuum pressure and exhaust gas is blocked or damaged, it may cause engine oil to spray from the exhaust pipe. 3. Engine cylinder failure: For example, a broken piston ring in a cylinder may lead to excessive blow-by gas during the engine's compression stroke, causing engine oil to spray from the exhaust pipe. Generally, oil spraying is mainly caused by exhaust valve damage, one-way valve blockage, or a clogged exhaust pipe.
I've been driving a diesel car for seven or eight years and have encountered the issue of fuel injectors not spraying fuel several times. The most common cause is a clogged diesel filter, especially when the filter hasn't been replaced for a long time or when poor-quality diesel is used. Last time, the car suddenly stalled on the highway because the diesel from a small gas station had too much water, which clogged the filter. Another common issue is wear and tear on the high-pressure fuel pump, which is extremely expensive to repair, often requiring the replacement of the entire pump core. If you have difficulty starting the engine in cold weather, it might be due to air entering the fuel lines, which requires loosening the fuel pipes to bleed the air. The most troublesome problem is a malfunction in the solenoid valve of the electronically controlled fuel injector, which triggers a warning light on the dashboard. This type of issue can only be diagnosed with a computer scan. It's advisable to check the fuel supply system during every maintenance session, as prolonged neglect of faulty injectors can damage the engine.
