2002-2005 4.2 Trailblazer tuned ecm

Custom ECM Tune for 2002–2005 4.2L (Trailblazer/Envoy Platform)

• Precise ignition timing adjustments
• Optimized fueling for maximum performance
• Increased rev limiter for extended powerband
• Cooling system parameters modified to run hotter when needed
• Elimination of unnecessary sensors and emissions-related controls
• Factory security (VATS) completely removed

This tune is fully compatible with the stock wiring harness. However, you will need to install a push-button start and hotwire the fuel pump for proper functionality. For demolition derby or off-road applications, it is also recommended to hotwire the transmission for improved reliability.

NOTE: This ECM tune is intended for off-road use only. Not for use on public road