What Causes BMW Engine to Shake When Idling with AC On?

1 Answers
CarolineDella
07/29/25 10:53pm
BMW engine shaking when the AC is on can be attributed to the following reasons: 1. Excessive carbon buildup in the throttle body and intake manifold: This alters the air passage cross-sectional area, preventing the control unit from precisely regulating idle air intake. This results in either overly rich or lean air-fuel mixture, causing incomplete combustion and subsequent vibration. 2. Faulty spark plugs: Weak sparks from individual malfunctioning spark plugs can compromise engine performance, leading to "misfire" symptoms and unstable idling. 3. Fuel pressure issues: Insufficient fuel pressure leads to poor fuel atomization from injectors, with fuel spraying in streams or even dripping in severe cases. Reduced fuel injection causes excessively lean mixture.
Was this review help?
12
4
Share
More Forum Discussions

What is the height of the Maxus V80?

The specific body dimensions (length/width/height) are 5785/1998/2345mm respectively. Below is relevant information about the Maxus V80: 1. Introduction: The SAIC Maxus V80 is a commercial MPV meticulously developed by SAIC Maxus Automotive Co., Ltd. based on European automotive and design standards, cutting-edge energy-saving and environmental protection concepts, combined with comfortable driving experience. It is suitable for mobile business, commuting, and travel, while also serving urban logistics and special industry purposes. The V80 perfectly interprets the MAXUS brand's core values of "Technology, Trust, and Progress" with numerous international benchmarks, setting a standard for international commercial MPVs. 2. High Efficiency and Low Consumption: Equipped with Italian VM engine technology, it delivers an output power of up to 136 horsepower, with a fuel consumption as low as 5.4L per 100km at constant speed. Upgraded to meet China V standards, it complies with China V, Euro V, and Euro VI emission standards. The 4-cylinder 16-valve engine, with fuel pressure up to 1800Bar, ensures more complete combustion, greater power, lower fuel consumption, and reduced emissions.
15
1
Share

What Does Wax Washing a Car Mean?

Wax washing a car primarily utilizes a cleaning agent composed of palm wax, high molecular polymers, surfactants, penetrating fluids, and emulsifiers to achieve vehicle cleaning, dust removal, and stain removal. Long-term Damage from Not Washing the Car: Urban rainwater is acidic. If not cleaned promptly, it can harm the car paint. Additionally, rainwater often contains other impurities. If not rinsed off in time, prolonged exposure to sunlight can cause water stains to form on the car's surface, which, if left untreated, can affect the paint. In the short term, there might not be significant damage, and many car owners may not wash their cars immediately. However, if possible, washing the car after the rain stops is better for the vehicle. Simply purchasing a cleaning agent for a quick rinse will suffice. Long-term Damage from Not Washing the Car: Washing the car isn't just about removing dirt—it's also about protecting the paint. If you observe carefully after rain, some cars will have water droplets forming on their surfaces. This happens because car owners who maintain their vehicles regularly wash them to remove dust, tar, resin, and other particles adhering to the paint, keeping it smooth. As a result, rainwater forms into droplets.
6
4
Share

How Long After Waxing Can You Wash the Car?

You can wash the car 2-3 days after waxing. Concept of Car Wax: Car wax is a traditional protective coating for car paint. It mainly consists of natural or synthetic wax, which penetrates into the paint's micro-cracks to create a smooth surface, enhancing gloss. Traditional car waxing primarily focuses on gloss enhancement and protection. Functions of Car Wax: Since cars are frequently exposed to the elements, they inevitably endure wind and rain. Car wax can reduce water droplet adhesion on the paint surface by 60-90%. It also helps flatten residual water droplets, minimizing the formation of dark spots, erosion, and damage caused by sunlight focusing through the droplets.
9
3
Share

What is the engine model of the Elysee?

The engine models of the Elysee are NFP, EC5, EC5 CNG dual fuel, and N6A 10XA3APSA. Taking the 2018 Elysee Automatic Fashion model as an example, it is equipped with a 1.6L naturally aspirated engine, with a maximum power of 86kW and a maximum power speed of 6000 rpm. The maximum torque is 150Nm, and the maximum torque speed is 4000 rpm. The 2018 Elysee Automatic Fashion is a compact car with body dimensions of 4427mm in length, 1748mm in width, 1476mm in height, and a wheelbase of 2652mm.
10
5
Share

How to adjust the high beam height of BYD F3?

The method to adjust the high beam height of BYD F3 is: Open the engine hood, locate the adjustment bolt, and turn the bolt to adjust. The BYD F3 is a compact car. Taking the 2020 BYD F3 Classic as an example, it belongs to the compact car category with body dimensions of: length 4533mm, width 1705mm, height 1490mm, and a wheelbase of 2600mm. The 2020 BYD F3 Classic is equipped with a 1.5L naturally aspirated engine, delivering a maximum horsepower of 109hp, a maximum power output of 80kW, and a maximum power speed of 5800 revolutions per minute.
17
1
Share

What lights to turn on when temporarily parking?

Temporarily parking requires turning on the hazard warning lights, also known as the emergency flashers. Introduction to Hazard Warning Lights: Hazard warning lights, commonly referred to as "double flashers", are a red triangle with an exclamation mark (!) button switch, colloquially known as hazard lights or emergency flashers. They are signal lights used to alert other vehicles and pedestrians that the vehicle is experiencing a special situation. Conditions for Turning on Hazard Lights: Hazard lights should be turned on immediately when a vehicle encounters a breakdown during road travel and cannot be moved to a safe area in time. This alerts passing vehicles and pedestrians to be cautious, and the driver should promptly call for help and wait for rescue.
19
0
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.