How to Upgrade a Toyota 3.0

There are many ways to upgrade your 3.0 liter Toyota engine to produce more horsepower and make the engine operate more efficiently. The 3.0 liter six-cylinder engine is featured across many Toyota models. One way to improve the car's performance is to install an upgraded engine control unit, or ECU. This can be done in a few simple steps.

Difficulty:

Moderately Easy

Instructions

things you'll need:

• Aftermarket ECU

1. • 1

     Locate the engine control unit (ECU) installed in your Toyota. The specific location will depend on the model in which the 3.0 liter engine is installed. Typically, the ECU can be found at the rear of the engine bay on the passenger side.

   • 2

     Ensure that your Toyota is powered off. Pull out the metal ECU box and disconnect the wiring harness that's attached to the ECU assembly.

   • 3

     Connect the aftermarket ECU to the wiring harness and latch the harness shut to secure the harness to the new ECU assembly.

   • 4

     Reinsert the ECU assembly into its compartment, then shut your Toyota's hood to complete the upgrade.