Why Does the Teana Frequently Experience Misfiring?

[MatteoMarie]

1. Fault Diagnosis: Common symptoms include: abnormal engine operation or insufficient power, uneven engine performance at high, medium, and low speeds accompanied by rhythmic shaking, black smoke from the exhaust, and backfiring. Engine misfiring can lead to increased fuel consumption, black smoke emission, lack of power, reduced horsepower, inability to accelerate, severe shaking, and increased driving noise. Moreover, it poses significant risks to driving safety. Particularly on uphill starts, the engine load increases in misfiring vehicles, resulting in more noticeable body shaking and a higher likelihood of sudden stalling. 2. The operation of an engine with misfiring can cause substantial harm: 1. Decrease in engine speed and power. 2. Increased fuel consumption and emission pollution. 3. Accelerated wear of moving parts, shortening the service life of lubricating oil. 3. Repair Methods: First, check for electrical circuit faults, then inspect the valve sealing (cylinder compression ratio). If no issues are found in the above checks, it may indicate mechanical aging or damage, requiring a major overhaul.

[Samuel]

My Teana has been in use for nearly five years, and the issue of cylinder misfiring has been a constant headache. This is usually caused by ignition system problems. For example, the ignition coils in older Teana models are particularly prone to aging and failure. Once the coil's output voltage is insufficient, the cylinder fails to ignite. Spark plugs also need replacement when they reach the end of their lifespan; failing to replace them can lead to excessive carbon buildup, directly causing misfires. In terms of the fuel system, clogged fuel injectors or insufficient fuel supply can imbalance the air-fuel mixture, resulting in noticeable engine shaking. Sensor failures, such as a faulty crankshaft position sensor, can disrupt ignition timing and increase the likelihood of misfires. Vacuum line leaks are another hidden danger, as they can make the intake air-fuel mixture too lean. It is recommended to inspect ignition components every 60,000 kilometers, use high-quality gasoline to avoid clogs, and regularly visit a professional shop for diagnostic code checks to prevent costly repairs of the catalytic converter later on.

[LaJulian]

I drive the Teana for business every day and have encountered misfiring several times, feeling severe shaking during acceleration. The main causes lie in the fuel and ignition systems. Worn-out spark plugs can easily lead to misfiring, especially after frequent start-stop cycles in urban traffic jams. Ignition coils age quickly under high temperatures, and replacing them usually works. Additionally, clogged fuel injectors due to poor cleanliness can cause issues, especially when using low-quality fuel. Sensor problems, such as a faulty oxygen sensor, can affect the air-fuel mixture ratio, leading to misfiring. I believe regular maintenance is key—replace spark plugs every 50,000 km, check vacuum tubes for cracks, and avoid sudden acceleration to extend component lifespan.

[BarrettDella]

As a long-time owner of the Teana, misfiring is often caused by issues with spark plugs or ignition coils. Spark plugs fail once they reach the end of their lifespan, leading to no ignition; aging ignition coils cause unstable voltage. Clogged fuel injectors are also a common issue and require regular cleaning. Sensor failures, such as a faulty crankshaft position sensor, can interfere with ignition. Replace these components early to avoid engine damage.