Is the Peugeot 307 shaking for one or two seconds upon startup a malfunction?
2 Answers
Peugeot 307 shaking for one or two seconds upon startup is a normal phenomenon. Reasons for car shaking: When the car shakes during startup, the internal operating resistance of the engine is relatively high, so the ECU will inject more fuel, which can cause some shaking. Additionally, the oxygen sensor has not reached its operating temperature during startup, which can also lead to engine shaking. Reasons for car shaking in winter: In winter, cold starts causing shaking for two seconds are due to low temperatures. The exhaust pipe temperature also drops, and the oxygen sensor has a minimum operating temperature. As a result, the vehicle's ECU cannot obtain accurate data, leading to errors in ignition and fuel-air mixture control, which weakens the vehicle's power output and causes shaking.
I've been driving a Peugeot 307 for six years, and the slight shake during cold starts is quite common. There are mainly two scenarios to consider: a mild tremble when starting in winter is normal, and worn rubber engine mounts in older cars can amplify the vibration; if accompanied by erratic tachometer jumps or flashing warning lights, then it's time to check the ignition coils and fuel injectors. Last time my car shook and emitted black smoke, it turned out the ignition coil for the fourth cylinder was cracked. My advice is not to rush into repairs—first observe whether the car runs smoothly after warming up. Another common issue with the 307 is that a dirty throttle body can cause jerky shaking like gasping for air, which can be fixed by buying a can of cleaner and spraying the throttle track yourself.
