[thumbster]

Originally Posted by gmcsierra2002

I'm no certified technician, but you should not have to reset the computer after performing this modification. Thats the whole point of electronic fuel injection / computer controls, it should automatically adjust air / fuel mixture to optimal ratio.

If that were the case you would have to reset your computer with the changing seasons / altitude you are driving / etc.

The only way for the ECM to detect sensor baselines is with a complete reset. Fuel trims will adapt to a certain extent, but sensor baselines dictate fuel trims and change when you mod. After I installed my catback I notice the engine rpms would flare up excessively at cold startup - not until a full year later when I yanked my battery terminals for doing the air intake mods the rpm flare up fixed itself. Also, there are certain mods that will trigger a CEL if you don't disconnect the battery. I know from several people who installed CAIs (airaid in particular) on their Tundras and had a CEL - this fixed itself after resetting the ECM via the battery disconnect. One guy drove around with his CEL on (MAF code) and was stubbornly insisting it will fix itself from driving it. His mileage went down to 12 mpg and the truck ran poorly, so he finally decided to disconnect the battery and it was all taken care of.

So guys, don't be lazy - disconnect your battery after every airflow related mod you do!