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  3. GMC 9544103056

GMC 9544103056 Fuel Rail Injectors 4.2L

fits model: R45, Envoy. make: Gmc. year: 2002–2004.

9544103056 Gmc 2002-2004 Envoy Fuel Rail With Injectors 4.2l R45

( Manufacturer Part Number: 9544103056 ), ( Type: Fuel Injector )

Review GMC Fuel Rail Injectors 4.2l fits ENVOY R45 2002–2004

The **GMC 9544103056 OEM Fuel Rail Injectors for the 2002-2004 Chevrolet/GMC Envoy with a 4.2L Duramax R45 diesel engine** represent a critical component in maintaining peak performance, efficiency, and reliability for this robust half-ton SUV. Designed as a direct replacement for the factory-spec injectors, these precision-engineered parts are meticulously crafted to meet or exceed the stringent standards set by General Motors, ensuring seamless integration with the high-pressure common-rail fuel system. Each injector is built with a robust **piezoelectric actuator**, which delivers ultra-fast response times and precise fuel metering, allowing for optimal combustion and reduced emissions essential for the R45 s turbocharged, intercooled diesel operation. The injectors feature a **high-flow, multi-hole nozzle design**, engineered to atomize diesel fuel into microscopic droplets, enhancing combustion efficiency and power delivery while minimizing soot and particulate matter. Constructed from high-grade **stainless steel and hardened components**, these injectors are resistant to corrosion, wear, and thermal stress, making them ideal for the demanding conditions of daily driving, towing, or off-road adventures. Whether replacing worn-out original equipment or upgrading an older engine for improved performance, these OEM-quality injectors ensure consistent fuel delivery, smoother idle, and better throttle response key factors in preserving the Envoy s legendary towing capacity and fuel economy. Backed by GM s original specifications, they provide the reliability and durability expected from genuine parts, reducing the risk of leaks, clogs, or erratic spraying that can plague aftermarket alternatives. For owners seeking to restore their 4.2L Duramax to factory-like performance or extend its lifespan, these injectors are an indispensable upgrade, combining engineering precision with the trustworthiness of a true OEM solution.

### **Pros and Cons of Buying GMC 4.2L (R45) Fuel Rail Injectors (2002-2004 Envoy) Part Number 9544103056**

#### **Pros:**

1. **Direct Replacement Fitment** The part number **9544103056** is a genuine GMC OEM (Original Equipment Manufacturer) fuel rail injector designed specifically for the **4.2L V6 (R45) engine** found in the **2002-2004 GMC Envoy**. This ensures proper compatibility with the vehicle s fuel delivery system, reducing the risk of installation issues.

2. **High-Quality Manufacturing** GMC OEM parts are built to the same standards as those installed at the factory, meaning they should provide reliable performance and longevity if properly maintained.

3. **Warranty Coverage** Purchasing from an authorized dealer or a reputable aftermarket supplier may include a warranty, offering some protection against defects or premature failure.

4. **Prevents Fuel Delivery Issues** Worn or failing injectors can lead to **poor fuel atomization, misfires, reduced power, and increased emissions**. Replacing them with new OEM injectors restores proper fuel delivery, improving engine performance and drivability.

5. **Compatibility with Upgrades** If you plan to modify the engine (e.g., turbocharging, forced induction, or performance tuning), OEM injectors provide a solid foundation before upgrading to aftermarket high-flow injectors.

6. **Easier Installation** Since these are direct replacements, they should fit without requiring extensive modifications to the fuel rail or wiring harness.

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#### **Cons:**

1. **Cost** GMC OEM injectors are typically more expensive than aftermarket alternatives. Depending on the supplier, prices can range from **$150 to $300 per injector**, with labor costs adding to the total expense.

2. **Potential for Counterfeit Parts** If purchasing from an untrusted source (e.g., eBay, Craigslist, or unlicensed online retailers), there is a risk of receiving **counterfeit or refurbished injectors** that may not perform as expected. Always verify the seller s reputation and part authenticity.

3. **Limited Longevity Compared to Aftermarket** While OEM injectors are reliable, some aftermarket brands (e.g., **Denso, Delphi, or Stanadyne**) offer longer warranties and potentially better durability, especially in high-mileage or modified engines.

4. **May Not Be Necessary for Minor Issues** If the injectors are only **slightly worn** (e.g., minor carbon buildup or slight leaks), cleaning them with **fuel injector cleaner** or using **aftermarket cleaners** (like **Seafoam or CRC**) may be a cheaper alternative before resorting to replacement.

5. **Installation Complexity** While straightforward, injector replacement requires **disconnecting fuel lines, removing the fuel rail, and properly sealing connections**. If not done carefully, fuel leaks or improper seating can occur.

6. **Potential for Overkill** If the engine is **high-mileage or severely neglected**, replacing only the injectors may not fully resolve performance issues. Other components (e.g., **fuel pump, sensors, spark plugs, or ignition coils**) may also need attention.

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### **Conclusion:**

Replacing the **GMC 4.2L (R45) fuel rail injectors (part #9544103056)** with OEM parts is a **sound investment** if you are experiencing **misfires, poor acceleration, or check engine lights (P0171/P0174 fuel trim issues)**. The benefits of **reliable fuel delivery, improved performance, and long-term engine health** outweigh the higher cost compared to aftermarket options in most cases.

However, if you are on a tight budget or the injectors are only **mildly degraded**, **cleaning them first** or considering **aftermarket injectors with a warranty** could be a more cost-effective solution. Always **verify the seller s legitimacy** to avoid counterfeit parts and ensure proper installation.

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### **Recommendation:** 1. **If Symptoms Are Severe (Misfires, Rough Idle, Poor Power):**

- **Buy from an authorized GMC dealer or a trusted aftermarket supplier** (e.g., **RockAuto, Summit Racing, or a local auto parts store with return policies**).

- **Get a fuel system diagnostic** (e.g., **scan for live data, check fuel pressure, inspect injectors for leaks**) to confirm if injectors are the sole issue.

- **Replace with OEM injectors** if they are confirmed faulty.

2. **If Symptoms Are Mild (Occasional Misfires, Slight Power Loss):**

- **Try cleaning the injectors** with **high-quality fuel injector cleaner** (e.g., **Liqui Moly Jectron, CRC Fuel System Cleaner**).

- **Consider aftermarket injectors** (e.g., **Denso or Delphi**) if cleaning fails, as they often come with **better warranties** at a lower cost.

3. **If Modifying the Engine (Turbo, Forced Induction, Tuning):**

- **Upgrade to high-flow injectors** (e.g., **Stanadyne or Delphi performance injectors**) to match fuel delivery with increased demand.

4. **Always:**

- **Drain the fuel system** before installing new injectors to remove old fuel contaminants.

- **Use O-ring sealant** (e.g., **Permatex 24000**) to prevent leaks.

- **Reset the ECU** after replacement to avoid initial misfire codes.

**Final Verdict:** For **reliability and peace of mind**, **OEM injectors (9544103056) are the best choice** if the engine is running poorly. However, **aftermarket options with warranties** can be a budget-friendly alternative if the issue is not severe. Always **prioritize quality and authenticity** to avoid costly mistakes.

Details:

It is a genuine GMC part designed specifically for fuel injection in the vehicle. It is a reliable and essential part for maintaining the fuel system in GMC Envoy. This component plays a crucial role in delivering fuel to the engine, ensuring optimal performance and efficiency. The product is a 2002 2004 GMC Envoy fuel rail with injectors for 4.2L engine.

part #: 9544103056 price

  • $85.95

specifications carfuelinjector:

  • for models: R45, Envoy
  • for makes: Gmc
  • for years: 2002-2004
  • mpn: 9544103056
  • type: Fuel Injector

general carfuelinjector:

  • Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors
  • condition: Used

shipping carfuelinjector:

  • carrier: USPS
  • class: Standard
  • transit: 3-7 Days
  • cost: $13.95
  • service: USPS Ground Advantage
  • type: Fixed

payments carfuelinjector:

  • credit card: Mastercard
  • wallet: Paypal
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returns carfuelinjector:

  • paid by: Seller
  • policy: Returns Accepted
  • time: 14 Days

offer carfuelinjector:

  • options: Ship-to-home
  • quantity: 1
  • started: April 21, 2026
  • availability: In Stock
  • sold: 0

seller carfuelinjector:

  • # reviews: 4991
  • rating: 99.7%
  • city: Crest Hill, Illinois
for models: r45, envoy, for makes: gmc, for years: 2002-2004, type: fuel injector,
category: auto parts > air fuel delivery > fuel injection parts > fuel injectors, sku: 16021418438646762,
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1 offer $85.95 USD
  • Used. Offer #1 priced at $85.95 + $13.95 shipping estimate = $99.90* total. It is a reliable and essential part for maintaining the fuel system in the GMC Envoy. The product is a 2002-2004 GMC Envoy fuel rail with injectors for a 4.2L engine.+$13.95 shipping

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