BLOX Racing BXAC-00700 ECU Jumper Harness for 88-91 Honda Civic/CRX & Integra

Vehicle Fitment

• 1988-1991 Honda Civic (EG chassis; MPFI: Base, DX, Si)
• 1989-1991 Honda CRX (Base, HF, Si, MPFI)
• 1990-1991 Acura Integra (GS, LS, RS trims; MPFI)

Fitment Notes

• Connects OBD-1 ECU (P28, P30, P72, P91, P08, optionally P05/P06 with VTEC conversion) to OBD-0 chassis harness
• Preserves factory sensor wiring (VTEC, knock, IAB, pressure switches)
• Not compatible with OBD-2 ECUs or non-MPFI (carbureted) models

Features

• Silicone fiber-reinforced wiring--heat/oil resistant
• Pinned connectors retain OEM sensor functionality
• Includes pigtail for 4-wire O2 sensor & VTEC/IAB solenoid setup
• Enables full tuning capability via OBD-1 ECU
• IAT, TPS, CKP, and O2 support retained
• Nickel-plated terminals resist corrosion
• Plug-and-play--no soldering or splicing required
• Manufactured by BLOX Racing; includes 1-year warranty

Specifications

• Length: ~10"; Weight: ~0.6 lb
• Connector types: OBD-0 chassis side & OBD-1 ECU side
• Wire: silicone fiber gauge--resistant to engine heat/oils
• ECU compatibility: OBD-1 P28, P30, P72, P91, P08 (P05/P06 VTEC conversions)
• Warranty: 1-year manufacturer warranty

Included Components

• 1x BLOX Racing BXAC-00700 jumper harness
• 1x PDF installation guide (online)
• Warranty/warning card (CA Prop 65)

Product Description

The BLOX Racing BXAC-00700 is a purpose-built jumper harness that connects an OBD-1 Honda ECU to an OBD-0 chassis--a plug-and-play solution for Civic, CRX, and Integra MPFI swaps. It carries connectors for essential sensors like knock, O2, IAB, pressure switches, and VTEC solenoid (with VTEC conversions), while reinforcing wiring with heat-resistant silicone-fiber insulation.

This harness allows full tuning potential of OBD-1 ECUs (P28, P30, P72, P91, P08, or VTEC P05/P06) without splicing, soldering, or modifications. By preserving OEM sensor integrations and using nickel-plated terminals, it ensures reliable performance and durability in high-heat underhood environments. Backed by BLOX's 1-year warranty, it's a clean, efficient way to unlock ECU tuning on classic chassis.