Downey
SILVER Star
When we were trying to get the TBI fuel injection conversion kit smog exempt, one of the Federal test we conducted was with the stand-alone GM TBI installed "without" any factory emissions equipment attached, and the Landcruiser ran cleaner than when we then added back in the factory emissions pieces that would have had to be retained to get an exemption. We never received an exemption because we could never pass the Federal "cold start" test, filthy rotten shame since the Landcruiser ran soooo much cleaner once the TBI system went into close loop after engine warm up. So because the engine runs dirtier with a TBI conversion the first couple miles you drive each day, you don't legally get to have an engine that runs much cleaner than stock for the remaining dozens/hundreds of miles you drive each day.This is a real worthy reason; I would love to see it proven.
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