What are the causes of poor engine ignition?
1 Answers
Common causes of difficult engine starting: 1. Ignition difficulties caused by carbon buildup in the car, accompanied by slight shaking at idle. Cleaning the throttle valve, intake tract carbon deposits, and fuel injectors can solve the problem. 2. Weak spark plug ignition energy. Some owners delay replacing spark plugs beyond the maintenance cycle to save money, leading to significantly reduced ignition energy and even misfires. Many modern engines use direct injection, which places higher demands on spark plugs. 3. Insufficient low-pressure fuel supply. Low fuel pressure in the low-pressure fuel circuit directly causes the engine to require a second ignition attempt. The specific reason is that the first attempt fails as the low-pressure fuel circuit builds up pressure, while the second attempt succeeds. Components to check: fuel pressure regulator, fuel pump, fuel filter, and internal fuel lines. 4. Weak battery. Battery-related issues are more common, and the first thought when a car won't start is often a dead battery. The solution is simple: jump-start the car using another vehicle or battery. 5. Clogged exhaust pipe. Exhaust blockages are rare unless by coincidence or sabotage, but they're relatively easy to diagnose. 6. Overly rich or lean air-fuel mixture. Spraying carburetor cleaner near the throttle valve can make the car start more easily. 7. Incorrect engine timing. Mismatched timing will prevent the engine from starting. Many car engines use timing belts, which themselves aren't problematic, but replacing the alternator belt on certain engine models can cause the timing to jump, resulting in failure to start.
