What Causes Automatic Transmission Cars to Shudder During Startup?
1 Answers
Automatic transmission cars may shudder during startup due to the following reasons: 1. Severe engine carbon deposits, which absorb the gasoline sprayed by the cold start injector, resulting in an overly lean air-fuel mixture and making startup difficult; 2. Issues with the ignition system, such as malfunctioning spark plugs; 3. Unstable oil pressure, abnormal fuel pump supply pressure, or incorrect readings and malfunctions of the intake pressure sensor; 4. Aging engine components, where worn engine mounts fail to absorb the minor vibrations during operation; 5. Significant differences in tire pressure, leading to uneven force distribution while driving. Solutions to address the shuddering during startup include: 1. Cleaning the fuel system and checking the idle speed control valve for carbon deposits; 2. Inspecting and replacing spark plugs if necessary; 3. Checking the oil pressure and replacing components as needed.