What Are the Reasons for Poor Car Acceleration?
1 Answers
Reasons for poor car acceleration include electrical circuit faults, fuel system faults, mechanical faults, and chassis faults. Electrical Circuit Faults: Low high-voltage ignition energy or irregular ignition, spark plug erosion or excessive carbon buildup, inaccurate ignition timing, oxygen sensor failure, etc. Fuel System Faults: Low fuel pressure, poor fuel injector performance, etc. Mechanical Faults: Insufficient cylinder pressure, obstructed intake manifold, blocked exhaust pipe, stuck throttle, incorrect valve timing, poor engine cooling, etc. Chassis Faults: Chassis faults may also affect vehicle acceleration. Common issues include clutch slippage, brake drag, and low tire pressure. Methods to Address Poor Car Acceleration: Conduct a road test by performing multiple starts, accelerations, and braking tests to eliminate chassis faults. Focus on inspecting the engine, starting from simple to complex, checking each component one by one. First, use a diagnostic tool to read fault codes. If fault codes are present, address them accordingly. Inspect the ignition coil and perform a high-voltage spark test. If the high-voltage spark is normal for all cylinders, remove and inspect each spark plug. If they are also normal, preliminarily rule out ignition system issues. Use a diagnostic tool to read the engine data stream, focusing on the throttle opening angle. The standard value is 4 to 8 degrees. If it exceeds 10 degrees, it is significantly high, indicating carbon buildup in the throttle. If the throttle opening angle is too high, remove and clean the throttle. Disassemble the engine intake manifold and clean it with a carburetor cleaner. After reassembly, test the engine data stream again. When the idle speed stabilizes, a throttle opening angle of around 6 degrees is normal.
