Nitrogen is almost inert... almost, to quote answers.com
Elemental nitrogen has a low reactivity toward most common substances at ordinary temperatures. At high temperatures, molecular nitrogen, N2, reacts with chromium, silicon, titanium, aluminum, boron, beryllium, magnesium, barium, strontium, calcium, and lithium (but not the other alkali metals) to form nitrides; with O2 to form NO; and at moderately high temperatures and pressures in the presence of a catalyst, with hydrogen to form ammonia.
so I can't say what it is doing to your combustion chamber deposits, but it might do something.
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