What Are the Causes of Engine Shaking During Downshifting?

1 Answers
CarsonLee
07/30/25 3:34am
Engine shaking during downshifting can be caused by a dirty air filter, worn-out spark plugs, among other reasons. Dirty Air Filter: The air filter is designed to protect the engine and reduce wear, typically requiring replacement around every 10,000 kilometers. If not replaced in time, insufficient air intake can lead to low idle speed, causing the engine to shake. Replacing the filter element can resolve this issue. Spark Plug Lifespan: Spark plugs have a limited lifespan and are responsible for igniting the fuel-air mixture to generate power. After exceeding 30,000 to 40,000 kilometers, their ignition efficiency significantly decreases, which can affect engine performance. This is one of the most common faults, and replacing all the spark plugs can solve the problem.
Was this review help?
15
5
Share
More Forum Discussions

What are the symptoms of overfilling transmission fluid?

Symptoms of overfilling transmission fluid include: 1. More air is drawn into the transmission, causing air blockage at the drain holes on the control valve, leading to poor drainage and gear shifting impact; 2. The fluid level becomes too high, making it easier to come into contact with rotating components during driving. The agitation of the fluid by these components can create bubbles, which, when drawn into the oil pump, result in abnormal oil pressure and reduced lubrication effectiveness; 3. Increased resistance to gear rotation, affecting the transmission's efficiency and reducing its cooling capability. It's essential to add the correct amount of fluid—neither too much nor too little. The fluid level can be checked using the transmission dipstick, with the ideal level being slightly above the middle mark.
18
4
Share

What is the difference between original car glass and replacement glass?

There are differences in the sealing between original car glass and replacement glass. If there are installation issues with a replaced windshield, it may lead to water leakage during later use. In severe cases, driving the vehicle could cause the windshield to detach, resulting in an accident, which is extremely dangerous. Below are specific methods to check whether the glass has been replaced: 1. Check the manufacturer: Examine the manufacturer code on the glass to identify which company produced it. Generally, car manufacturers purchase glass in bulk and do not use too many brands or the same brand from different production locations. 2. Check the production date of the glass: If there is a significant difference in the production dates of the glass pieces on a single vehicle, it may indicate that the car has been refurbished or the glass has been replaced later. 3. Check the glass label: If the car glass has been replaced, the new glass label will differ significantly from the original factory label.
10
0
Share

How to reset the tire pressure on the Buick Regal?

Method to reset the tire pressure on the Buick Regal: Press and hold the odoTrip button, toggle the mileage display on the combination instrument until only the total mileage is displayed, then press and hold the odoTrip button again. After a few seconds, the low tire pressure indicator will start flashing. When two beeps are heard, it indicates the reset is complete. The Buick Regal is a mid-to-high-end sedan under the Buick brand, positioned between the Excelle and LaCrosse. It is highly favored by users for its trendy, dynamic, and tech-savvy product image and comprehensive technical capabilities. In terms of body dimensions, the Buick Regal measures 4843mm in length, 1856mm in width, and 1484mm in height.
15
0
Share

What happens if there is too much engine oil?

Excessive engine oil can negatively impact the engine. In severe cases, it may damage the three-way catalytic converter, cause engine oil leaks, reduce engine power, create unnecessary resistance to crankshaft rotation, and consequently affect power output while increasing fuel consumption. When there is too much oil in the engine, the movement of the crankshaft and connecting rod ends will violently agitate the oil during operation. This not only increases the rotational resistance of the crankshaft and internal power loss but also leads to more oil splashing onto the cylinder walls, easily resulting in oil burning and discharge. When adding oil, there is a marked scale—generally, keeping the oil level between the minimum and maximum marks on the dipstick is sufficient.
3
3
Share

Does the Ford Mondeo's water pump removal and installation require disassembling the timing belt?

The Ford Mondeo's water pump removal and installation requires disassembling the timing belt. Automotive engines widely use centrifugal water pumps, whose basic structure consists of components such as the pump housing, connecting plate or pulley, pump shaft and bearings or integrated shaft bearings, pump impeller, and sealing device, making it a major component of the vehicle. The Mondeo is a mid-size sedan featuring an advanced powertrain system, along with FordPass Connect, SYNC3 in-car connectivity system, and intelligent driver-assistance technologies, representing the future direction of smart connected vehicles. In terms of body dimensions, the Mondeo measures 4873mm in length, 1852mm in width, and 1470mm in height.
4
1
Share

When is the Right Time to Replace Antifreeze?

Antifreeze should generally be replaced every two years or 40,000 kilometers. Antifreeze prevents the coolant from freezing and cracking the radiator or damaging the engine cylinder block during cold winter parking. Its full name is antifreeze coolant. Many people think antifreeze is only used in winter, but in fact, it is required year-round. Antifreeze is a type of coolant containing special additives, primarily used in liquid-cooled engine cooling systems. It offers excellent performance in preventing freezing in winter, boiling in summer, and resisting scale and corrosion throughout the year. Corrosion prevention function: The engine and its cooling system are made of metals such as copper, iron, aluminum, steel, and solder. Over time, these metals can corrode and rust when exposed to water under high temperatures. Antifreeze not only avoids causing corrosion to the engine cooling system but also provides anti-corrosion and rust removal functions.
1
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.