1986-93 GM 4.3L V6; 5.0,5.7 and 7.4L V8 TBI Harness Std. Length
This harness is standalone and is not intended to replace the OEM engine wiring. Standalone harnesses are intended to run the designated engine and transmission only, generally when swapped into another vehicle.
This harness is designed for 1986 - 1993 4.3L, 5.0L, 5.7L, 7.4L Throttle Body Injection engines. These harnesses will not work with a '94 or '95 ECM and will not operate a 4L60E transmission. These engines were factory equipped in GM full-size trucks, vans, and SUVs, S-10/S-15 trucks and suvs, Oldsmobile Bravadas, Chevy Astro vans, and Camaro/Firebird platforms. Harnesses do not include all the original connections for the original emissions but are available separate, see the specs page for more details. Also available for this harness is a detailed step-by-step manual, and GM color coded wires with labels for easy installation.
This harness also requires the following mating parts; ECM #1227747, #16121154, or #88999146. Calpack #16060836, and a prom to match you engine: (4.3L) #16082087, (5.0L) #16139492, (5.7L) #16139566, (7.4L) #16128359. This Prom does not control any transmission or torque converter functions.
We recommend checking the online manual for the full list of required mating parts prior to ordering.
Harness Length: 4 Feet Between Engine and ECM
Fuse Type: Blade
Firewall Passthrough: Grommet
Color Code Based: 1990 GM Truck
Circuit Designations: Printed Wire Tags on all Connectors and Open Ended Wires
Connections Included:
Harness includes all connections for fuel injection operation: ECM, MAP, O2, TPS, ESC, IAC, IAT, CTS, Knock, Injectors, Distributor, OBD1 w/SES light, VSS and TCC solenoid.
This harness includes connections for the following components:
- A/C Power
- Brake Switch
- Data Link Connector
- Distributor
- ECM
- EGR Valve
- Electronic Spark Control Module
- Engine Coolant Temperature
- Fuel Pump
- Fuel Pump Relay
- Fused System Power
- Grounds
- Idle Air Control
- Ignition Switch Signal (Fused)
- Ignition Timing Setting
- Injectors
- Knock Sensor
- Malfunction Indicator Lamp
- MAP Sensor
- O2 Sensor
- Oil Pressure
- Park/Neutral Indicator Switch
- Starter
- Throttle Position Sensor
- Torque Converter Clutch
- VSS
If you plan to mount the ECM under or behind the passenger seat please see Painless Performance®™ part number 60201 as it provides 8 feet of harness length between the main engine breakout and the ECM connectors.
Installs which have an external coil distributor:
PPP60124- This pigtail will be required in order to connect the coil to the distributor.
PPP60125- This pigtail will be required in order to connect the power to the coil and will provide a tach signal from the coil.
