Why does the car not accelerate when in third gear?
1 Answers
If the car can accelerate in first and second gears but not in third gear, it is likely due to insufficient idle speed. Increasing the idle speed can prevent the car from stalling. Below are some possible causes and solutions for the issue of not accelerating when shifting gears: 1. Check the fuel: The octane rating is a monotonically increasing curve and has no functional relationship with the compression ratio. Higher octane fuel burns slower and produces less combustion knock, requiring a higher engine compression ratio. Conversely, lower octane fuel burns faster and produces more combustion knock, requiring a lower engine compression ratio. Lower octane gasoline burns faster, so the ignition timing should be retarded; higher octane fuel burns slower, so the ignition timing should be advanced. In addition to the manual, the manufacturer usually recommends the fuel octane rating on the inside of the fuel tank cap. 2. Check the fuel filter and related components: Inspect the fuel filter (including fuel lines and connectors) and the air filter (including whether the intake pipe is deformed or clogged) for excessive dirt or blockages. 3. Check the fuel injectors: See if they are clogged. 4. High-pressure fuel pump: Inspect the high-pressure fuel pump. 5. Issues after major repairs: If the timing gears in the gear chamber are not aligned properly, stepping on the accelerator may not deliver fuel due to delayed ignition timing.
