Wouldn't Have Expected. - Toyota Yaris Forums

Yaris Hilton · 08-28-2009, 08:48 AM

The smoke tells you nothing about how much carbon was built up in your engine or was removed by the Seafoam. The smoke is mostly coming from the light oil in the Seafoam, called "pale oil" in the MSDS. True, if the gummy stuff that builds up on intake valves and ports, or the harder stuff that builds up in combustion chambers, gets broken off and moved to the exhaust, it'll get hot enough to put out smokey gases. But you can't tell how much of it's from that stuff as the oil you're pouring into the intake smokes out. Do the procedure over and over and you'll always see lots of smoke. (I wouldn't recommend repeating it frequently as I think it is somewhat hard on catalysts and O2 sensors.)

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08-28-2009, 08:48 AM	#10
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	The smoke tells you nothing about how much carbon was built up in your engine or was removed by the Seafoam. The smoke is mostly coming from the light oil in the Seafoam, called "pale oil" in the MSDS. True, if the gummy stuff that builds up on intake valves and ports, or the harder stuff that builds up in combustion chambers, gets broken off and moved to the exhaust, it'll get hot enough to put out smokey gases. But you can't tell how much of it's from that stuff as the oil you're pouring into the intake smokes out. Do the procedure over and over and you'll always see lots of smoke. (I wouldn't recommend repeating it frequently as I think it is somewhat hard on catalysts and O2 sensors.)