when the electric motor start the gas engine, there is a rattle and vibration that happens for couples of seconds and goes away. a knockings or ratcheting or grinding sound like. it's seems it coming from the passenger side or some sort. this happens when the car start cold or sometime when the car is hot, sitting a parking lot and the electric motor start the gas engine, i will hear this sound and vibration. there are times, if i stop at a red light or stop , and light turns green, i press the gas pedal, the car will rough idle or starving or choking, sputtering or loss of power symptom, after that episode it will start running normal. There is no engine light or ecu codes. have you experience this before, how did you fix it. Your guidance and wisdom is welcome. 2016 prius C thank you.
How many miles and has all required OEM maintenance been performed; per OEM manual? You should have pending P0300 misfire code, if you scan the car.
Spark plugs, coils, air leak, throttle, fuel and more. If you had taken readings while the engine was running, it would have given a more detailed explanation of the engine rattling. A visual inspection through the spark plug wells inside the combustion chambers for coolant leakage using an endoscope is also applicable. In the morning on a cold car.
What’s the miles? Prius c is more-or-less a gen 2 engine IIRC, and nowhere near as prone to head gasket failure, but could happen. Check codes. If there’s a specific cylinder misfire code (denoted by P0301 through P0304), swap coil/plug from offending cylinder with another, see if code changes accordingly, to confirm or eliminate it’s coil/plug problem.
Consider purchasing diagnostic tools. These can be special programs for a laptop, OBDII adapters, cables-transition devices. A phone with programs and adapters for a phone can also be used. They will help in case of diagnosing errors that suddenly appeared. Gen2 OBD2 app review | PriusChat The choice is yours. It is better to do this preventively than to run around a faulty car later and ask on the forum what happened.
