Why does the Xingcheng 3 lack power?

[SanMartin]

Xingcheng 3 lacks power due to the following reasons: Ignition system-related causes: Spark plug gap does not meet standards; distributor rotor is damaged; incorrect firing order among cylinders; incorrect ignition timing; weak high-voltage spark; internal faults in the electronic ignition unit and pulse signal generator, etc. Main causes in the valve train: Incorrect valve timing; poor valve sealing; weakened or shortened valve springs, etc. Fuel supply-related causes: Dirt or moisture in the fuel lines; faulty fuel pump; improper assembly or adjustment of the carburetor float; clogged air filter; defective or improperly adjusted emission control system; blocked exhaust system.

[MacCharlotte]

When my Mazda3 was lacking power, it felt like even climbing a slope was difficult, mainly due to the aging of the engine components. The spark plugs had been used for too long, resulting in low ignition efficiency and affecting combustion; the fuel injectors were clogged with carbon deposits, causing uneven fuel atomization; the dirty air filter restricted airflow, leading to ECU control imbalance. Neglecting regular maintenance, such as timely oil changes, accelerated component wear. I remember once being stuck in city traffic, pressing the accelerator to the floor but the RPM wouldn’t rise. Fortunately, I drove to a professional shop for diagnostics—after replacing the spark plugs and cleaning the fuel injectors, performance was immediately restored. It’s recommended to inspect the engine system every 5,000 km to avoid letting issues escalate and compromise driving safety.

[LeElena]

When driving the Mazda3, I also experienced a power drop, feeling sluggish. The root cause often lies in fuel system maintenance. Poor quality fuel with many impurities leads to severe carbon buildup; an aging fuel pump with insufficient pressure causes poor fuel delivery; this becomes more noticeable in high summer temperatures when the ECU's protection mechanism kicks in to limit output. I recall that long road trip when power suddenly dropped midway—inspection revealed water in the fuel tank corroding the filter screen. Later, I started regularly adding carbon-cleaning additives and switched to higher-octane gasoline, which significantly reduced the issue. Maintaining the fuel system is key—it saves fuel and preserves performance.

[NevaehDella]

My car's lack of power stems from reckless modifications. I changed the exhaust tailpipe but didn't tune the ECU, resulting in unstable exhaust pressure and excessive backpressure burdening the engine. Upgrading to high-performance spark plugs without matching the system caused ignition delays. As a result, the RPM rises quickly during acceleration but torque is insufficient, making the car feel sluggish. After restoring factory settings, the improvement was significant. Modifications should be done within one's means—don't just chase high performance.