Honda has been talking up plans to add a diesel to its US lineup, starting with an unnamed 2009 Acura model assumed to be the TSX. Turns out Honda neglected to cover all its bases: The new engine reportedly passes emissions when equipped with a manual transmission but not when an automatic is bolted up. Acura wisely decided the U.S. business case for a diesel TSX sans slushbox was problematic, resulting in the temporary cancellation of the program. Will we ever see it? Ward's reports a source simply saying "The (diesel in the) Acura has been canceled.” [Ward's via Temple of VTEC]