Gm factory leanburn
 

Was cruising the corvette forums and came across a guy claiming he went into the stock software of his tpi corvette and found the leanburn setting but it is disabled from factory. Anyone else ever came across this or heard of it? Sounds possible. I know Chrysler on purpose runs the 4.0l inline six motors rich to extend the life of the cat.

It is called "lean cruise" and you can use pcm tuning software to mess around with it.

lean tuning for mileage?? anyone try it or know anything about it? - Page 2 - LS1TECH

bandit86 -

Maybe this is location dependent? The 5th-gen (1992-1995) Honda Civic VX hatchback had lean-burn in the USA, but the programming was weakened in California to meet emissions regulations.

CarloSW2

All of GM's LSx engines have lean cruise saved in the ECU but its disabled on US market cars. Its switched on in places like australia etc where lean AFRs are allowed. Don't expect a huge FE gain but its worth something.

Anyone know how to get in the system and mess with the software?