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I have a 2007 Hyundai Accent and white smoke at startup and now severe white smoke on occasion when driving. 16k miles, I drive about 600 miles a month.

David Jimenez Jul 15, 2009

It is manual transmission, and the problem does not occur everytime...but today, 104 temp, it spewed white smoke at a stop (severe) and then stop spewing smoke. It is white white white.

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Benjamin Patri

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Posted on Jul 15, 2009

Benjamin Patri

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White smoke or semi white can be produced in several ways. One way is oil this is normally a whitish blue to blue smoke and has the apparent smell of oil being burned. Next could be antifreeze when it is being burned it has a sweet type of smell and tends to dissipate in the air rather quickly and usually is because of a bad head gasket. Next is automatic transmission fluid which is normally found on automatic transmissions and its normally drawn into an engine thru a vacuum line via a defective transmission modulator valve or some other defective part. Transmission fluid is very apparent and billows out so bad that you can't see anything behind you. Last but not least another type of smoke that is not white but black is the presents of to much gas/fuel being burned in the engine. If one of these fluids is low and/or you notice one of the symptoms that I pointed out above, then you know where to start looking for a fix.

I would also check your oil for discoloration. If it is a brownish color it could mean your oil and antifreeze are mixing and has the potential to damage your bearings.

Benjamin

Benjamin Patri Jul 15, 2009

I would guess the antifreeze is burning as it is one of the more common problems on a car but again, you should check to see if it is low or if any other fluid I mentioned above is low. Is the car running hot at all? Since I can't see it, I can't know for sure but if the symptoms above match for any of them, then that is probably the culprit. Make sure the car is cool before checking coolant and make sure it is running while checking the transmission fluid.

1 Related Answer

Anonymous

15935 Answers
Posted on Jul 15, 2009

SOURCE: I have a 2007 Hyundai

White smoke during startup is indicative of a blown head gasket and/or cracked cylinder head..
Have the cylinders pressure tested to verify.
Do not use engine additives to try and stop the leak. They do not work.

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