ACDELCO GM/GM GENUINE PARTS 19421334 Multiport Fuel Injector

( Brand: Acdelco Gm/gm Genuine Parts ), ( Manufacturer Part Number: 19421334 ), ( Part Type: Fuel Injector ), ( Make: Buick ), ( Year: 2004 2005 2006 2007 2008 2009 )

Review ACDELCO GM/GM GENUINE PARTS Multiport Fuel Injector fits 2004–2009

The **ACDelco GM 19421334 Multiport Fuel Injector** is a high-performance, direct-replacement component designed to deliver precise fuel delivery and optimal engine efficiency for General Motors applications, including a wide range of vehicles spanning from modern turbocharged engines to classic high-performance setups. Engineered with ACDelco s signature reliability and engineering precision, this multiport fuel injector is built to meet or exceed OEM specifications, ensuring seamless integration with your vehicle s fuel injection system. Constructed from durable materials, including a robust stainless steel body and a high-quality ceramic or metal-oxide coating on the nozzle tip, this injector is engineered to resist corrosion, wear, and thermal stress, even under demanding driving conditions such as high RPMs, aggressive throttle inputs, or extended periods of heavy load. The internal design features a precision-machined needle and seat assembly, which works in tandem with the injector s solenoid to atomize fuel with exceptional consistency, promoting efficient combustion and reducing emissions while maximizing power output.

Ideal for applications requiring high-flow performance, such as turbocharged or supercharged engines, the **19421334** is capable of delivering precise fuel metering at pressures up to **100 bar (1,450 psi)**, making it a versatile choice for both stock and modified vehicles. Its compact yet robust design ensures a secure fit within the engine bay, with a robust electrical connector that resists vibration and ensures reliable signal transmission from the engine control unit (ECU). Whether you re restoring a classic muscle car, upgrading a modern performance vehicle, or addressing a fuel system failure, this injector is designed to restore factory-like performance without compromising on durability. Backed by ACDelco s reputation for quality and compatibility, this part is an excellent choice for mechanics, DIY enthusiasts, and professional tuners seeking a dependable, long-lasting solution for their GM-powered vehicles. Proper installation, including calibration and ECU reprogramming if necessary, will ensure optimal performance and longevity.

### **Pros and Cons of buying a ACDelco GM Multiport Fuel Injector (Part Number: GM 19421334)**

1. **OEM Quality and Reliability** ACDelco is a trusted aftermarket brand that produces parts designed to meet or exceed General Motors original equipment specifications. This ensures compatibility and performance similar to an OEM injector.

2. **Widely Available** As a common GM part, this injector is easy to find in auto parts stores, online retailers (Amazon, RockAuto, AutoZone), and through dealerships, reducing lead times.

3. **Cost-Effective Alternative to OEM** While not identical to a brand-new GM injector, it is significantly cheaper than purchasing an OEM part directly from a dealer, offering good value for performance-oriented drivers.

4. **Compatibility with Aftermarket Tuning** Many aftermarket tuners and performance chips (e.g., Haltech, AEM, or standalone ECUs) work well with ACDelco injectors, making it a practical choice for modified vehicles.

5. **Durable Construction** ACDelco injectors are built to handle standard fuel pressures and flow rates, making them suitable for daily drivers and light performance applications (e.g., mild turbocharging, supercharging, or forced induction).

6. **Warranty Coverage** ACDelco typically offers a warranty (often 12 24 months), providing some recourse if the part fails prematurely due to manufacturing defects.

7. **Easy Installation** Like most multiport injectors, this part is straightforward to install with basic tools, though proper cleaning and calibration (via tuning) may be required for optimal performance.

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1. **Not True OEM** While high-quality, it is not an exact factory replacement. Some drivers report slight differences in spray pattern or flow characteristics compared to genuine GM injectors, which may require tuning adjustments.

2. **Potential for Inconsistencies** Like all aftermarket parts, there is a risk of receiving a slightly mismatched unit (e.g., incorrect flow rate or resistance) if purchasing from a less reputable seller. Always verify specifications before buying.

3. **Limited Longevity Under Extreme Conditions** For high-performance applications (e.g., aggressive turbocharging, nitrous oxide use, or extreme boost levels), ACDelco injectors may wear out faster than premium aftermarket brands (e.g., Delphi, Stanadyne, or Moroso).

4. **Tuning May Be Required** If replacing injectors on a tuned vehicle, the ECU may need recalibration to account for differences in injector response. This could require a tuner s visit, adding to the cost.

5. **Quality Variability by Supplier** Some online sellers or discount retailers may carry lower-quality knockoffs labeled as "ACDelco," which could fail prematurely. Buying from authorized dealers or reputable online stores (e.g., RockAuto, Summit Racing) minimizes this risk.

6. **Not Ideal for High-Flow or Racing Applications** For extreme performance builds (e.g., drag racing, high-boost turbo setups), higher-end injectors (e.g., Delphi 250 series or Stanadyne) are often preferred for better durability and precision.

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The **ACDelco GM Multiport Fuel Injector (19421334)** is an excellent **cost-effective, reliable alternative to OEM** for most daily drivers, light tuners, and performance builds where extreme demands aren t present. It strikes a balance between affordability and quality, making it a practical choice for those who want OEM-like performance without the dealer markup.

However, if you re running a **high-performance or heavily modified vehicle** (e.g., aggressive turbocharging, nitrous, or extreme horsepower goals), investing in a **premium aftermarket injector** (e.g., Delphi, Stanadyne, or Moroso) may be worth the extra cost for long-term reliability. For most stock or mildly modified GM vehicles, ACDelco is a **solid recommendation**.

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- **Buy from a trusted source** (e.g., RockAuto, Summit Racing, or an authorized ACDelco dealer) to ensure authenticity and quality.

- **Verify the part number and specifications** (flow rate, resistance) match your vehicle s requirements.

- **Consider tuning** if replacing injectors on a modified vehicle to optimize fuel delivery.

- **For extreme performance applications**, research higher-end injectors to avoid premature failure.

**Final Verdict:** **Good for most applications; excellent value for the price.** If budget is a concern and the vehicle isn t subjected to extreme stress, this is a **highly recommended choice**.

Details:

Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Genuine ACDelco Parts. Electrical parts are not returnable. Some GM Genuine Parts may have formerly appeared as ACDelco Original Equipment OE.

Specializing in high-quality automotive aftermarket parts. Parts must be resalable and in the original packaging.

part #: 19421334 prices

• $44.99-$132.50

specifications carfuelinjector:

• for years: 2004-2009
• brand: Acdelco Gm/gm Genuine Parts
• mpn: 19421334
• part type: Fuel Injector
• make: Buick
• year: 2004 2005 2006 2007 2008 2009

shipping carfuelinjector:

• transit: 4-7 Days
• service: Standard
• class: Standard
• type: Fixed
• cost: $16.99

seller carfuelinjector:

• # reviews: 328
• rating: 96.3%
• city: Tempe, Arizona

payments carfuelinjector:

• other
• credit card: Visa
• wallet: Apple-pay

general carfuelinjector:

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

offer carfuelinjector:

• availability: In Stock
• quantity: 3
• started: February 7, 2026
• sold: 0
• options: Ship-to-home

returns carfuelinjector:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

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