1998–2005 GM 3100/3400 Tuned ECM — No Core Required

1998–2005 GM 3100/3400 Tuned ECM

Ready-to-run derby and off-road ECM — no core required.

This LMMF tuned ECM is built for 1998–2005 GM 3100 and 3400 V6 engines used in demolition derby, race, off-road, and simplified build applications. It is set up to remove factory limitations, simplify the system, and help keep your engine running when conditions get hot and rough.

Kept in stock • Usually ships within 1–2 business days • No core required • Compatible cores purchased separately

Fits

• 1998–2005 GM 3100 / 3400 V6 engines
• Demolition derby, race, off-road, and simplified build applications
• Factory wiring harnesses or compatible LMMF simplified standalone harnesses

What This ECM Includes

• Security / VATS delete
• Raised rev limiter
• Fueling adjustments for the intended derby, race, and off-road application
• Timing adjustments for the intended application
• Adjusted temperature parameters
• Unused sensors removed to reduce unwanted shutdown and fault issues
• MAF delete

No Core Required

This ECM is supplied by LMMF. You do not need to send in an ECM core or return one after purchase.

We Buy Cores

LMMF buys compatible 1998–2005 GM 3100/3400 ECM cores separately. Contact us before sending one in so we can confirm compatibility and provide current purchase details.

Installation Notes

• With a factory harness, a push-button starter and fuel-pump hotwire are needed for a simplified derby-style setup.
• For the easiest installation, pair this ECM with an LMMF Simplified Standalone Harness.
• For demolition derby applications, a transmission hotwire may also be recommended depending on the transmission setup.

In Stock & Fast Shipping

These tuned ECMs are kept in stock and usually ship within 1–2 business days.

Pair it with an LMMF simplified harness, wire it up, and send it.

Off-road, race, engine-swap, and demolition derby use only. Not intended for emissions-controlled or street-driven vehicles.