The burning smell and bluish ( grey ) smoke are due to engine oil being burnt or has gotten into the exhaust via the exhaust port.
Oil are able to get to the export ports because the valve stem seals are bad and not providing proper sealing to prevent oil from getting past the valve guides and getting to the exhaust port.
Another possible cause of the smell could be due to engine oil leakages and engine oil is being spilled onto the exhaust. This would emit the funny smell.
Nov 6, 2009 at 1:19 PM