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Guest Message by DevFuse

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Brown SMOKE?

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2 replies to this topic

#1 xoomer


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Posted 26 October 2005 - 02:53 PM

when I first start my XT in the morning there is DARK brown smoke coming out of the exhaust and it only last for a moment? oil?


What is going on?

#2 canajun2eh


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Posted 26 October 2005 - 03:51 PM

Dark brown smoke is usually caused by too much fuel. The fuel/air mixture is too rich. It can also be caused by a cold catalytic converter.

Since the problem only lasts a few seconds, I wouldn't worry about it. I'd be more concerned if the problem didn't go away after the engine was at normal operating temperature.

Blue smoke is oil burning. White "smoke" is coolant, probably due to a leaking head gasket, but there are other ways in which coolant can get into the combustion chambers.

Black smoke is too much fuel.

You COULD try different brands of fuel. Some will produce less of that brown smoke than others. Try for an Ethanol blend (not more than 10 percent), if you can get it. Ethanol blends burn much more cleanly than non-ethanol gas. When you try different brands of fuel, you need to do your checking after you've filled up for the 2nd time.

#3 xoomer


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Posted 26 October 2005 - 03:53 PM

ok.. well I have another Cat and o2 sensor... I think I'm gonna put that on...

But first I got my Susie to run... That'll be my DAily Driver until I get my roo running good.

Fuel = Arco lowest grade.

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