Why does my car misfire when its cold but not hot?
Cold engine misfires often stem from faulty spark plugs, weak ignition coils, or dirty fuel injectors. Begin by inspecting spark plugs for wear or fouling, then test ignition coils for proper function. Check fuel injectors for clogging and clean if necessary. If the vehicle misfires on ignition, a complete diagnosis involves finding the combustion process element that is lacking, which is either lack of fuel injection or a lack of combustion chamber heat. There is a low level of fuel being pumped into the ignition or the fuel charge in one of the cylinders fails to ignite.An engine misfire happens when the cylinders in the engine don’t burn right or the combustion within the chamber is incomplete (or nonexistent! Typically, engine misfires can be caused by a variety of factors, including malfunctioning coils, worn or faulty spark plugs, a leak or a faulty ignition switch.And that damage can cost thousands to repair, if it is repairable at all. So yes, a misfire can destroy your engine if you ignore it.Misfires don’t simply go away – they need to be addressed immediately. Even if they don’t get worse, they certainly won’t get any better unless you take the car to a mechanic.