Lexus CT200h morning misfires in reverse and coolant system leak, no solution yet suggested to disassemble engine for machine shop evaluation on Lexus CT200h

Some Lexus CT200h owners report experiencing morning misfires in reverse alongside coolant system leaks, which can lead to further damage if not addressed promptly. These misfires may occur due to coolant leaking into the combustion chamber, causing issues until the engine warms up and burns off the residue. Additionally, low coolant levels can result in overheating, exacerbating the misfire problem. Owners are advised to check for signs of coolant wetness on spark plug electrodes or oil on the porcelain, as these conditions can trigger misfires. Furthermore, a failure of engine sensors, including the Mass Air Flow sensor and Coolant Temperature sensor, has also been linked to engine misfires. To mitigate these issues, replacing spark plugs or cleaning fuel injectors may often provide relief. Consulting with a qualified mechanic for a proper diagnosis is recommended before considering more extensive engine disassembly.