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What causes white smoke when i first start the car and shaking but after a few minutes of idling it goes away?
Wiki User
∙ 14y ago
"White smoke" is typically nothing more than water vapor. The normal products of combustion in an internal combustion engine are carbon dioxide and water. When the engine and exhaust system are cold, the exhaust leaves the tailpipe much cooler than it was when it first burned in the engine cylinder. When that happens, the water vapor tends to merge together and condenses into the form of a white cloud. When the engine and exhaust system warm a little, the hot exhaust gas dissipates in the air before the water vapor cools, and you no longer see the condensed water vapor. In other words, the white vapor is normal when the engine is cold.
As for running a little rough when the engine is cold, many vehicles do that and it isn't a problem; but if you are concerned, you could have someone run a compression test to make certain that there are no burned valves, and you could replace the plugs/wires to make certain that you don't have a misfire situation. But for me, if it runs well once it warms up a bit, I'd tend to leave it alone. But then, it's a matter of degree. How bad is it when it's cold, and how long does it last? If it's under 15 seconds, I wouldn't worry about it.
Wiki User
∙ 14y ago
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What causes low idling smelly exhaust and a shaking car that almost stalls for the first few minutes after startup and then runs fine this only happens a few times a month?
Leaking fuel injectors. Catalytic converter... i had same problem. smells like rotton eggs right?
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bad/partially blocked catalytic converter. - kind of a rotton egg smell, right?
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Shaking can be caused by a number of things. Is the whole car shaking or is it more in the stearing wheel or during braking. Have the tires balanced. This is inexpencive and could be the problem also have them checked for seperation. It could be a severly worn wheel bearing. If the shaking occurs more during braking it could be a warped rotor. A worn tie rod can also cause some shaking. My best advise is take it to a tire shop first to rule that out and most shops can check the tie rods, wheel bearings and also brake rotors. Hope this can help get you started.
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