Mechanics

BLACK CARBON SOOT

2001 Honda City • 160,000 miles

Throttle body starts accumulating black soot in run of 50 to 100kms after I clean throttle body. I have also cleaned PCV valve which also accumulates soot along throttle body.
My car's ignition timing is right, I would like to know if tappet settings valve clearance as.007 inch for intake and.009 inch for exhaust is correct. Is it ok to keep exhaust clearance to.010 instead of.009? Any other tips which can help me reduce black carbon soot. Also compression test of all cylinders show 1st-190, 2nd-200, 3rd-200, 4th-200.
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Chetan
September 16, 2011.




The valves are correct, the compresson is good. As far as the valve adjustments, keep it where the manufacturer recommends.

Is there any black smoke from the exhaust?



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