High Fuel Consumption And Excessive Emissions? Nine Times Out Of 10, The Problem Starts With This Little Fingernail-sized Thing: A The Fuel Injector.

Your car's fuel consumption is increasing and it has consistently failed annual emissions test. Dealers recommend replacing spark plugs, cleaning throttle body, cleaning catalytic converters-you spend money everywhere, but problems persist. The truth may surprise you: Nine out of 10 of the problems come not from these main components, but from a fraction of the size of a fingernail- a the fuel injector.
A faulty injector is like the engine's "slow drink."
The working principle of the fuel injector is not complicated: the ECU issues commands, a solenoid valve drives the needle valve to open and close, and fuel is injected precisely into the cylinder. The needle valve has a travel time of less than 0.3 mm and a opening and closing time of only 0.2 -0.5 milliseconds. This tiny part directly determines how cleanly every drop of fuel your car burns is.
Once the injector malfunctions, the most immediate consequence is poor atomization. Under normal circumstances, fuel is broken down into micron-sized particles that are fully mixed with air before combustion. But when injectors become clogged or worn, the fuel droplets become larger and more unevenly distributed, like swallowing food without chewing-nutrients are not absorbed at all. Poor atomization results in a 10% to 20% jump in fuel consumption, according to the study. That's no mean feat; more than a year of extra fuel costs are enough to replace two sets of injectors.
More crucially, the fuel injection was uneven. Take a four-cylinder engine, for example: if one cylinder sprays 52 millilitres of oil and two cylinders pump 44 millilitres, the difference may seem small, but the consequences are severe: the one-cylinder mixture is too thick, resulting in unburned fuel and black smoke; the two-cylinder mixture is too thin, causing uneven exhaust at idle, causing the engine to vibrate violently. In addition, since four-cylinder engines share an oxygen sensor, if the mixture in one cylinder is too thin, the oxygen sensor detects excess oxygen, and the ECU mistakenly enriches all cylinders, ultimately damaging the entire engine's air-fuel ratio. Actual tests have shown that under these conditions, CO2 concentration can plummet from 14 to 15 per cent of normal to just over 9%, resulting in very poor combustion quality.
Excessive emissions? The injector is the prime suspect. The first thing many people think of when they fail an annual inspection is that a catalytic converter has failed. However, in practical diagnoses, the main cause of both CO and HC excess emissions is often incomplete combustion, and the source of incomplete combustion tends to point to the fuel injectors.
When the injectors leaks or injects too much oil, the air is too mixed with the fuel, causing carbon monoxide and hydrocarbons in the exhaust to rise sharply. There was Obvious black stains on the exhaust pipe and a strong smell of unburned fuel. These unburned substances saturate catalytic converters, leading to blockages and poisoning over time, creating a vicious cycle-the failure ofcatalytic converters distorts oxygen sensor signals, misleads the the ECU and further increases fuel injection, leading to higher emissions and fuel consumption.
How to tell if an the injectors is malfunctioning
Typical are three signs: first, an inexplicable increase in fuel consumption of a liter or two per 100km; second, unstable idling and noticeable engine vibration, especially when the engine is cold; and third, low acceleration, which feels slow when you step on the accelerator. If you have two or more of these three symptoms, don't rush to replace the main area; check the injectors first.
Using diagnostic tools to read fuel injection width data is the fastest method. Normal idle pulse width is about 2-3 milliseconds. If the peak is more than 5 milliseconds, you can almost be sure the injector is malfunctioning. The the injector is then removed and the fuel injection volume of each cylinder is tested on the test stand. If the difference exceeds 10%, it should be replaced.
It is ten times cheaper to maintain than to repair it. Prevention is always more cost-effective than repair. It is recommended to wash every 20,000 to 30,000 kilometres with a professional cleaning agent. Don't wait for a blockage to open. Fuel filters are replaced every 20,000 to 40,000 kilometers, the first line of defense for the injectors. Best of all: Use fuel from reputable gas stations. Impurities in shoddy fuel and water are the number one killers of injectors.
In short: stop focusing on catalytic converters and spark plugs. If your car has high fuel consumption and low emissions, check this gadget first and nine times out of 10 problems will be solved.