# Edelbrock Chevrolet LS1 Pro-Flo 4+ EFI Knock Sensor Harness

When choosing to upgrade your engine to modern fuel injection, look no further than Edelbrock's Pro-Flo 4 EFI systems. Edelbrock has been delivering the best combination of dyno proven electronic fuel injection performance for over 40 years. Pro-Flo 4 is not just a replacement for your carburetor, it's a complete engineered system that provides the ultimate in performance, drivability and quality. These easy to use, self-learning EFI systems feature an all new ECU pre-loaded with 80 dyno-tuned calibrations that support popular engine configurations up to 800 hp. Combined with the enhanced E-Tuner 4 App's easy to use setup wizard; you get plug and play performance without the need of a laptop or costly dyno tuning sessions. Pro-Flo 4 EFI systems are the most complete systems available on the market, giving you what you need to upgrade to powerful and efficient fuel injection for your vehicle. Pro-Flo 4 EFI systems are the best value for your dollar!

-   New ECU Preloaded w/80 Dyno-Tuned Calibrations

This Part Fits:

Year

Make

Model

Submodel

2004

Chevrolet

Express 1500

Base

2004

Chevrolet

Express 1500

LS

## Details

- **Price:** 69.57 CAD
- **Vendor:** Edelbrock
- **Type:** Wiring Harnesses

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 69.57 CAD | In stock |

## Images

- Photo - Primary
- User 1

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/edelbrock-chevrolet-ls1-pro-flo-4-efi-knock-sensor-harness)
> Updated: 2026-06-27