What are the causes of unstable idle speed in a BMW 523?

1 Answers
MalachiRose
07/29/25 6:07pm
The main causes of engine idle speed fluctuation include: ignition electrical faults, such as ignition coils, spark plugs, etc.; fuel supply issues, such as excessively low or high fuel pressure, fuel pump, fuel filter, fuel injectors, etc.; intake system leaks; sensor failures, such as the front oxygen sensor, coolant temperature sensor, camshaft/crankshaft position sensor, VANOS, etc.; power supply problems, such as unstable generator output; and DME control module faults. Methods to reduce fuel consumption: The longer the idle time while parked, the higher the fuel consumption, so try to minimize idle parking time. Factors affecting fuel consumption: Various operating conditions such as acceleration, deceleration, braking, and engine idling.
Was this review help?
5
0
Share
More Forum Discussions

Can the vehicle be transferred if the engine number is different?

If the engine numbers are different, the vehicle cannot be transferred. Conditions for vehicle transfer: The conditions for vehicle transfer include having a legal source and complete documentation, no outstanding bank liens or court seizure records, no unresolved traffic violations or accident records, no outstanding fee arrears, and all required documents must be complete. Completing the transfer of a used vehicle legally ensures the transfer of ownership and guarantees the legality of the vehicle's origin. Precautions for vehicle transfer: Be sure to check the original vehicle's purchase tax receipt. Some vehicles may not have paid the purchase tax originally, and after transfer, these vehicles may be required to pay the outstanding tax. Insurance transfer should be completed promptly to avoid unnecessary complications during claims.
19
3
Share

Can You Refuel at Different Gas Stations?

You can refuel at different gas stations. Below is relevant information about automotive gasoline: 1. Overview: Automotive gasoline is a liquid fuel refined from petroleum, primarily used for cars and motorcycles. 2. Classification: In China, automotive gasoline comes in two types: unleaded and leaded. Unleaded gasoline has three octane ratings: 90, 93, and 95 RON (Research Octane Number). Leaded gasoline also has three octane ratings: 90, 93, and 97 RON. Among these, the lead content in 90-octane gasoline does not exceed 0.35g/L, while the lead content in 93 and 97-octane gasoline does not exceed 0.45g/L.
3
4
Share

What does the wrench icon mean after starting the car?

The wrench indicates that the car has reached its maintenance period and should be taken to a 4S shop for servicing. Car maintenance methods: Regularly check the engine oil, schedule regular tune-ups, inspect the timing belt, replace spark plugs and wires, change the fuel filter, replace the air filter periodically, and prevent engine overheating. Scope of car maintenance: Routine maintenance items mainly include engine oil and oil filter, air filter. The replacement of engine oil and oil filter is primarily for the maintenance of the lubrication system. Replacement of the fuel filter and pollen filter, maintenance and replacement of spark plugs, transmission oil, and other related system inspection items and maintenance.
11
3
Share

Is Turtle Wax Ice Wax Suitable for New Car Paint Damage?

Turtle Wax Ice Wax is not suitable for treating new car paint damage, as this type of ice wax offers poor cost-effectiveness and is relatively expensive, making it an unwise choice for the average consumer. Below is a related introduction to Turtle Wax Ice Wax: Advantages: Maintains shine several times longer; diamond-like clarity and gloss; innovative dust-resistant technology for long-term protection against erosion; restores the entire vehicle, repairs minor scratches, and forms a protective layer; UV-resistant formula prevents paint aging; no-residue formula allows for direct application under sunlight. Effects: With the application of pure synthetic coating technology, the gloss protection can last for months; it utilizes unique high-molecular polymers and various synthetic substances to achieve exceptional gloss performance, far surpassing many traditional glaze and coating products.
12
2
Share

Can the car be started without releasing the handbrake?

You can start the car without releasing the handbrake, but you cannot drive the car. The functions of the handbrake: When parking, pulling up the handbrake keeps the vehicle stationary and prevents it from rolling downhill; while driving, pulling up the handbrake during a turn can create a drifting effect; in emergencies, the handbrake can be used as a brake. Consequences of driving without releasing the handbrake: It accelerates the wear of the brake discs and causes the brake pads to harden due to overheating, reducing braking performance; it leads to excessive wear of the handbrake's brake pads, damaging the drive shaft; it locks the rear wheels, snaps the cables, and may result in skidding or rollover.
10
4
Share

What is a Judicial Vehicle?

Judicial vehicles are official vehicles used by judicial administrative organs, prisons, community correction departments, and people's courts. Introduction to Judicial Vehicles: Judicial vehicles are public service vehicles used by judicial authorities for law enforcement. Judicial authorities are state organs that exercise judicial power, constituting a fundamental component of national institutions. They are judicial organizations legally established to exercise relevant state functions. In China, judicial authorities in the narrow sense specifically refer to people's courts, while in a broader sense, they also include people's procuratorates. Classification of Judicial Vehicles: The abbreviated Chinese names for public security organs, state security organs, judicial administrative organs (prisons and community correction departments), as well as people's courts and people's procuratorates, are respectively "Public Security," "State Security," "Judicial," "Court," and "Procuratorate."
6
1
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.