I'm willing to bet that the longer smoke's mod you speak of included this file: particles.dat. Am I correct? It might have also included materials.dat (both of these files are located in \data\Library). These two files are the default files that come with SH3/4 that make up the standard effects used in the game (fires, smoke, explosions, etc.). I would restore those two files to their default (as installed) version and your fire problem will probably not be a problem anymore.
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