What is the reason why the car cannot accelerate beyond 80 mph?
2 Answers
Check if the cruise control system has set a maximum speed limit of 80 kilometers. Try pressing the speed limit button to deactivate the limit. If the engine has severe carbon buildup, it can significantly affect the vehicle's performance, so regular carbon cleaning is necessary. Here are other possible reasons: 1. Spark plug failure: If the vehicle's power suddenly decreases, it may be due to spark plug failure. If the power drops during driving and the engine shakes severely, it is likely caused by abnormal spark plug ignition, which can only be resolved by replacing the spark plugs. 2. Clogged air filter: If the air filter hasn't been replaced for too long, it will affect the vehicle's air intake efficiency. Insufficient air intake will result in poor power performance.
Even an experienced driver like me has encountered this situation! The car feels like it's being pulled by a rope when driving at 80 km/h. It's probably due to a clogged catalytic converter causing poor exhaust flow, just like a person can't run well when out of breath. Worn-out spark plugs with weak ignition are also a common issue—last time, after I replaced them with platinum spark plugs, the car immediately surged to 120 km/h. Haven’t changed the air filter in two years? If it's as dirty as a rag, the engine won’t get enough air and will struggle like it's starving. Old transmission fluid can also make acceleration sluggish—I remember my old Passat felt completely reborn after an oil change. Oh, and if the car struggles to accelerate when the fuel tank is down to a quarter, the fuel pump might be on its last legs.
