Engine Backfires and Fails to Accelerate When Cold but Runs Normally When Warm?

[VonGianna]

For the Range Rover Sport, the intake system can be inspected by opening the engine hood. Below is relevant information about cold starts in vehicles: 1. Fuel and Electrical System Maintenance: In winter, gasoline atomization conditions deteriorate, especially for carburetor-equipped vehicles, which are generally harder to start and may not immediately operate normally even after starting. Therefore, during winter maintenance, it's essential to clean and unclog all fuel and air passages, and inspect the throttle valve, choke valve, acceleration pump, and vacuum pump to ensure they are adjusted to optimal conditions. Additionally, the idle fuel mixture should be appropriately adjusted to guarantee smooth idle operation in extreme cold. 2. Brake System Inspection and Maintenance: Given the frequent icy and slippery road conditions in winter, first adjust the four tires to ensure uniform traction on the ground, preventing skidding and side slips. For vehicles with air brakes, properly adjust the preload of the balance spring in the master cylinder. Excessive preload can make braking feel 'hard,' causing immediate emergency stops, which are particularly hazardous in winter. For hydraulic brake systems, also check for leaks in the brake fluid, brake lines, and wheel cylinders, replacing the brake fluid promptly if any leaks are detected.