Causes of Unstable Idle and Easy Stalling

1 Answers
MollyDella
07/30/25 7:18am
There are several reasons for unstable idle and easy stalling: 1. Air intake system leakage. 2. Fuel pressure too low. 3. Air filter clogged. 4. Fuel injector atomization leakage. 5. Spark plug malfunction. 6. Air flow meter failure. Below is additional information: 1. The normal idle speed of an EFI engine is determined by the idle control valve. The ECU calculates signals such as engine speed, temperature, throttle switch, and air conditioning switch, then adjusts the idle control valve to open the intake bypass channel or directly increase the throttle opening to boost air intake and raise the engine idle speed. 2. Normally, air intake must be strictly controlled. If there's an intake pipe leak, the air flow sensor cannot measure the true air intake, causing the ECU to inaccurately control the air intake and resulting in unstable engine idle.
Was this review help?
3
4
Share
More Forum Discussions

What is the ground clearance of the Lincoln Corsair?

The minimum ground clearance of the Lincoln Corsair is 198mm. The minimum ground clearance of the Lincoln Corsair refers to the distance between the lowest point (excluding the wheels) and the supporting plane, which indicates the vehicle's ability to pass over obstacles such as rocks and tree stumps without collision. A higher ground clearance in the Lincoln Corsair improves its off-road capability, but if the ground clearance is too high, the stability at high speeds may decrease. The Lincoln Corsair is a compact SUV under the Lincoln brand. The body dimensions of the Lincoln Corsair are 4615x1887x1630mm, with a wheelbase of 2711mm. It is equipped with a 2.0T high-power engine, delivering a maximum power of 180kW and a peak torque of 390N·m, paired with an 8-speed automatic transmission. Generally, the ground clearance of sedans ranges between 110mm and 150mm, while SUVs have a ground clearance between 200mm and 250mm. However, the ground clearance of the Lincoln Corsair is not static; it also depends on the load condition. Therefore, changes in ground clearance should be considered based on the varying load of the Lincoln Corsair. When selecting a vehicle, ground clearance can be one of the reference factors. The choice should depend on the vehicle's intended use and the road conditions. For well-paved urban roads, a vehicle with lower ground clearance can enhance stability and comfort. For frequent travel to remote areas or regions with poor road conditions, a vehicle with higher ground clearance may be preferable to avoid scraping or damaging the undercarriage, considering its off-road performance.
13
4
Share

What Causes the Sunroof Leakage in the Envision?

The sunroof drainage holes or pipes in the Envision may be blocked by debris, or the sealing rubber strip may have aged, leading to leakage. The following precautions should be noted: 1. Pay attention to the waterproofing of the sunroof: The sunroof is sealed with a rubber gasket. During use, it's important to protect the gasket from dust, especially in winter or after long-distance travel. Regularly clean it with a duster. Additionally, never force the sunroof open when it's frozen, as this can damage the sunroof motor. In seasons with high wind and sand, clean the gasket with a damp sponge every two months. 2. Avoid fully opening the sunroof on bumpy roads: For electric sunroofs, it's best not to fully open them on rough roads, as excessive vibration between the sunroof and the sliding rails can cause deformation of related components or even damage the motor. 3. Avoid directing high-pressure water jets directly at the gasket: When washing the car, avoid aiming high-pressure water jets directly at the gasket. This can not only deform the gasket under pressure, allowing water to enter the cabin, but also significantly damage the gasket. 4. Thoroughly clean the sunroof tracks with talcum powder before long-term parking: Before storing the vehicle for an extended period, thoroughly clean the sunroof tracks with talcum powder to prevent the gasket from undergoing chemical reactions in the air and aging over time.
9
4
Share

What brand is the transmission of the Mazda CX4?

The transmission of the Mazda CX4 is a 6AT transmission from the Skyactiv brand. It features a multi-plate lock-up clutch, a torsional damper with improved damping performance, and a more compact torque converter, which increases the lock-up range of the torque converter, enhances the transmission efficiency, and reduces fuel consumption. The new Mazda CX4 adopts the family design language, with a large-area front grille, flatter and sharper headlights, and more prominent chrome trim, giving the car a more contemporary look. In terms of configuration, depending on the version, the new car is equipped with matrix ALH adaptive LED headlights, BOSE audio, and a new 8-inch central control display.
16
5
Share

Is the Mazda RX7 a two-door or four-door?

Mazda RX7 is a two-door model, which is a sports car under Mazda, available in both four-seat and two-seat versions. The Mazda RX7 adopts the traditional sports car standard FR (front-engine, rear-wheel-drive) configuration, equipped with a five-speed manual transmission, and features an integrated taillight design at the rear. It has won the hearts of many car enthusiasts with its high-performance rotary engine and captivating exterior design. The rotary engine is a uniquely structured engine with triangular rotors that are directly mounted on the crankshaft, allowing the engine to achieve very high speeds. The power delivery of the rotary engine also differs from that of a piston engine, as this type of engine only delivers power in the high RPM range.
18
0
Share

Where is the cabin air filter located in the Land Rover Freelander 2?

The cabin air filter of the Land Rover Freelander 2 is located under the glove box on the passenger side. There is a cover plate that can be removed to access it. The cabin air filter helps prevent tiny particles, pollen, bacteria, dust, and other impurities from entering the air conditioning system, thereby protecting the system and providing a clean air environment for passengers, ensuring their health. The Land Rover Freelander 2 is an imported vehicle, classified as a mid-size SUV with a hatchback body style. It features headlight washers, which are useful for effectively removing insect residues from the headlights after high-speed driving in urban areas. The door handles are made of plastic to prevent frostbite on hands in extremely cold conditions.
7
2
Share

What is the reason why the 2011 Corolla 1.8L model does not move when shifted into gear?

When an automatic transmission has difficulty shifting gears, in many cases, it is not due to internal valve body damage, but rather due to stubborn dirt and impurities inside, especially when dirt and impurities accumulate inside the valve body, forming blockages that prevent effective regulation of oil pressure, leading to jerking, impact, and slippage issues. At the same time, the issue of high transmission temperature should not be overlooked. Below are the specific details: 1. High Temperature: According to data from the Automatic Transmission Repair Association, "Over 90% of all faulty automatic transmissions are caused by overheating." High temperatures can degrade the quality and friction characteristics of automatic transmission fluid, increasing friction and wear, leading to transmission noise. Additionally, sludge (impurities or dirt) can form inside the transmission (e.g., in the valve body), causing jerking and impact. If the temperature exceeds 120°C, rubber sealing materials begin to harden, eventually leading to leaks and reduced hydraulic pressure. If the temperature rises further, the transmission starts to slip, and slipping in turn causes the temperature to rise even higher. (High-end models like Audi will trigger an alarm and enter transmission protection mode.) If not addressed promptly, the transmission may be irreparably damaged. 2. Solution: Therefore, to thoroughly resolve transmission issues and prevent their recurrence, it is essential to remove stubborn dirt and impurities from the transmission and effectively control the transmission's operating temperature. This is also the key to achieving "transmission fault resolution without disassembly."
19
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.