![]() ![]() ![]() If your exhaust is leaking from the manifold, there will be smoke coming up from under the hood. As the pressure is relieved, it’ll spray on the engine and cause a white clear smelling smoke. As in, it lets coolant out within the normal operating temperature of the vehicle. When a radiator cap goes bad, it relieves pressure too early. This saves the radiator from any permanent damage. When the pressure gets to a certain level, the radiator cap will allow it to escape. When your Sonic overheats, the radiator builds up pressure. Compared to oil, the smell will be sweeter. If your engine is overheating it’ll smoke as the temperature rises. This is a great place to start if you notice oil leaking from the valve covers. You’ll need to look up the exact torque specs for your valve covers. It can also be caused by the valve cover bolts not being torqued down enough. This is usually caused by a bad valve cover gasket, and not the valve cover itself. The color of the smoke coming from the engine will likely be blueish black, and burning oil smells bitter. There’ll be oily sludge on the head around the valve covers. When this happens, oil leaks directly on to the exhaust. One of the most common reasons why an engine would smoke is leaking valve covers. This list of common engine smoking causes is presented in order of likelihood from most to least likely to be the problem. Always treat the engine cooling fan like it can come on at any time. Be careful under the hood when the engine is hot. The most common reasons why your Sonic’s engine would smoke include overheating, burning oil, or a melting wiring harness. It can be caused by quite a few different problems, none of which should be ignored. If your Chevy Sonic’s engine has smoke coming from it, it needs to be addressed right away. ![]()
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