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If your Buick LaCrosse is showing rough idling, hard starts, or uneven throttle response, choosing the right fuel injector matters for dependable daily driving. The right injector helps maintain proper fuel delivery and engine balance, which affects fuel economy, emissions, and drivability. This guide shortlists the top options for the Buick LaCrosse and explains the criteria we used to evaluate fitment, flow precision, and durability. Read on to see the top picks and what to look for when replacing a fuel injector on this specific vehicle.
Looking for other parts? See all Buick LaCrosse parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Readair Fuel Injectors (6-pack) for 3.6L V6 Buick LaCrosse and compatible GM 3.6L V6 models |  |
| Most Popular A crowd favorite that many people choose with confidence | Automotive-leader 12629927 Fuel Injector Kit (6-pack) |  |
| Best Quality Built to a higher standard if you want something more solid | Looklardy 12608366 Fuel Rail with Injectors for Buick LaCrosse and Chevy Equinox |  |
| Best Budget The cheapest option that still gets the job done reliably | MACAX Fuel Injector Kit (Set of 6) FJ703 Compatible with Buick LaCrosse 3.6L V6 |  |
| Most Sold A high-volume bestseller chosen again and again | UIU FJ1157 Fuel Injector — 6-Pack |  |
| Best Value for Money The sweet spot between price and what you get | A-Premium Fuel Injectors 6‑Piece Set for Buick LaCrosse/Cadillac 3.6L |  |
| Best Overall The best all-around choice for most situations | NECATUO Set of 6 Fuel Injectors (replaces 12634126, FJ1157) |  |
1. Readair Fuel Injectors (6-pack) for 3.6L V6 Buick LaCrosse and compatible GM 3.6L V6 models
| Brand | Readair |
|---|---|
| Model | FB-10019 |
| Compatibility | 2010–2011 Buick LaCrosse 3.6L V6 |
| Package | 6 pieces |
These Readair fuel injectors are a direct replacement set sold as six units and intended to restore proper fuel metering on GM 3.6L V6 engines such as the 2010–2011 Buick LaCrosse. They are used when an injector is clogged, leaking, or causing rough idle and come with machined exterior bodies and improved internal seals aimed at reducing sticking and improving cold-start performance. In practice you install them under the intake manifold as a like-for-like swap, and users report smooth idle and straightforward fitment when paired with correct sealing parts. The product description highlights accurate spray patterns for more complete vaporization and seal materials rated for low-temperature starts. Important limitations: the set may not include high-quality replacement O-rings or washers in all cases, so plan to reuse OEM seals or source upgraded seal kits during installation. Also this is a replacement part for specific GM 3.6L applications, so verify part numbers before fitting to your LaCrosse.
Best for: A reliability-focused buyer who prioritizes restoring factory-like fuel delivery on a Buick LaCrosse 3.6L and prefers replacing the entire bank of injectors at once to avoid repeated repairs.
Less Ideal for: Not a good choice for owners needing a universal or cross-vehicle injector solution or for those who want a plug-and-play kit that guarantees upgraded seals included out of the box.
- Sold as a complete six-injector set for full-bank replacement on V6 engines
- Machined exterior and improved internal seals to reduce sticking and aid cold starts
- Designed spray pattern for efficient fuel vaporization and smoother idle
- Compatible with Buick LaCrosse 3.6L fitment listed for 2010–2011
- Replacement O-rings and small seal washers provided may be low quality so plan to source or reuse OEM seals
- Fitment is limited to specific GM 3.6L applications and requires part-number verification before purchase
Verdict A practical six-pack replacement that restores fuel delivery and idle on the LaCrosse 3.6L but plan to use or buy quality seals during installation.
2. Automotive-leader 12629927 Fuel Injector Kit (6-pack)
| Number of Pieces | 6 |
|---|---|
| Pin Count | 2-pin |
| Orifice Type | 6 Holes Disc Engine |
| Material Type | Metal |
This Automotive-leader kit supplies six fuel injectors designed to replace factory units on GM 3.0L V6 engines, including the Buick LaCrosse 2010 model. Each injector is a 2-pin, 6-hole disc design with stainless metal bodies and pre-installed O-rings for direct plug-in installation. In practice the set is used when multiple cylinders need replacement at once to restore smooth idle and eliminate misfire or fuel delivery codes. The manufacturer emphasizes corrosion-resistant materials and factory-standard fit so installers can expect straightforward swapping without modification. Benefits include a full-bank replacement to maintain balanced fuel delivery and compatibility with the listed GM part numbers. Limitations to be aware of are typical for aftermarket injectors: performance depends on correct vehicle match, careful O-ring handling during installation, and proper calibration or cleaning if deposits are present. Some users reported mixed quality control, so bench-testing or professional installation is recommended if you need consistent results across all six units.
Best for: Buyers seeking a convenient, complete replacement set to quickly restore fuel delivery on a 3.0L V6 Buick LaCrosse without sourcing individual injectors.
Less Ideal for: Drivers who want dealer-sourced or remanufactured injectors with factory testing, or those who need injectors tuned for performance upgrades should consider alternatives.
- Sold as a complete 6-piece kit for full-bank replacement on 3.0L V6 engines.
- Direct-fit design matched to GM part 12629927 for straightforward installation on compatible vehicles.
- Stainless metal body and pre-installed O-rings aimed at corrosion resistance and longer service life.
- 6-hole disc orifice and 2-pin electrical connector match the factory-style flow and wiring.
- Aftermarket quality control can vary so some units may require bench testing or replacement.
- No vehicle-specific calibration or cleaning is included so used or dirty fuel systems may still need service.
Verdict A convenient full-bank aftermarket injector kit made for quick replacement on Buick LaCrosse 3.0L V6s, best when you need a straightforward swap rather than factory-tested reman units.
3. Looklardy 12608366 Fuel Rail with Injectors for Buick LaCrosse and Chevy Equinox
| Brand | Looklardy |
|---|---|
| Model | 12608366 Fuel Rail W/Injectors |
| Manufacturer Part Number | 12608366 12608362 2633784 12650736 |
| Compatible Engines/Years | 2.4L — various 2010–2017 GM models |
This Looklardy fuel rail with injectors is a direct-replacement assembly intended for 2.4L GM vehicles including Buick LaCrosse and Chevy Equinox from the early 2010s. It combines the rail and four injectors into a single unit to simplify installation and restore consistent fuel flow when the original rail or injectors have failed. The listing states the part is machined and built to OEM specifications, which suggests the components aim for factory-quality fit and spray patterns for reliable drivability and throttle response. Typical use is as a like-for-like service part during fuel-system repairs or when cleaning individual components is impractical. Practical benefits include faster installation compared with sourcing separate injectors and a matched set that can reduce variability between cylinders. Limitations are that correct fitment depends on verifying part numbers and vehicle year, and buyers should expect a professional-level install or mechanical experience because the job involves fuel-system pressure and precise sealing. This product is focused on restoring performance rather than offering upgraded high-flow injectors for modified engines.
Best for: Performance-oriented buyers seeking a factory-replacement fuel delivery assembly to restore consistent power and throttle response on a Buick LaCrosse 2.4L.
Less Ideal for: Drivers planning an upgraded or high-flow fuel system for boosted or heavily modified engines should consider purpose-built performance injectors instead.
- Matched rail and injector set simplifies replacement and helps maintain uniform fuel delivery across cylinders.
- Manufactured to OEM specification claims for form and fitment, reducing the need for modifications.
- Machined exterior suggests precise construction and consistent sealing surfaces.
- Covers a range of compatible GM models so the same assembly can serve multiple common repair scenarios.
- Requires careful verification of part numbers and vehicle year to ensure compatibility.
- Installation involves the fuel system and typically needs professional tools or mechanic experience.
Verdict A matched, factory-style fuel rail and injector assembly built to replace worn components and restore stock fuel delivery on compatible Buick LaCrosse 2.4L engines.
4. MACAX Fuel Injector Kit (Set of 6) FJ703 Compatible with Buick LaCrosse 3.6L V6
| Connector Type | Push-in |
|---|---|
| Number of Ports | 12 |
| Material Type | Composite |
| Number of Pieces | 6 |
This MACAX kit supplies six composite-body fuel injectors sold as a direct replacement for FJ703-style injectors on Buick LaCrosse 3.6L V6 VIN:7 engines. Install is the same as a factory-style swap: plug the push-in connector, seat the injector into the rail and intake, and reuse or replace seals as needed. The injectors are described as composite with high-temperature Viton O-rings and factory-spec flow behavior, which should restore balanced fuel delivery and help smooth idle and throttle response on a LaCrosse with worn or leaking injectors. The kit targets a budget buyer, so material choices lean toward cost-effective composite construction rather than premium metals. That can be fine for everyday driving but may shorten lifespan under heavy-duty or high-mileage use. Fitment depends on exact VIN and engine sub-variant, so confirm the FJ703 fit before ordering to avoid compatibility returns. For a cost-conscious LaCrosse owner with moderate mileage, this offers a straightforward replacement option that can rejuvenate drivability without an OEM price tag.
Best for: Budget-conscious Buick LaCrosse owners who prioritize an affordable repair to restore drivability and prefer replacing the whole bank of injectors in one service visit.
Less Ideal for: Drivers who plan to keep a high-mileage LaCrosse long-term or use the car in performance or heavy-duty applications should consider longer-lived, premium injector options instead.
- Sold as a complete set of six to replace all injectors at once for consistent fueling
- Push-in connector and factory-style design simplify installation on compatible engines
- Composite body with Viton O-rings resists corrosion and handles high under-hood temperatures
- Composite construction may not last as long as higher-end metal injectors under heavy use
- Compatibility depends on VIN-specific fit; not a universal match even within similar GM engines
Verdict A wallet-friendly, full-bank replacement for LaCrosse 3.6L V6 owners who need a cost-effective restore of fueling but who should confirm VIN-specific fit before buying.
5. UIU FJ1157 Fuel Injector — 6-Pack
| Compatible Vehicles | Buick LaCrosse 2012-2018 |
|---|---|
| Quantity | 6pcs |
| Material Type | Metal, Plastic |
| Replacement Part Numbers | 12642128, 12642126, JSD9-B1, 16-9047, 67764, FJ1157 |
This UIU FJ1157 set supplies six replacement fuel injectors intended for direct replacement in compatible GM V6 engines such as the 2012–2018 Buick LaCrosse. Install is typical of injector swaps: remove the intake components as needed, disconnect the old injectors and electrical connectors, and fit the new units with the provided seals. The listing highlights metal and plastic construction, painted exterior finish, and design features aimed at accurate fuel spray, improved sealing and reduced sticking in cold starts. For a risk-averse buyer the appeal is straightforward: a matched six-pack simplifies replacing all cylinders at once and the parts claim cold-start sealing to -40°C. Important limitations are that this is an aftermarket unit from a third-party brand rather than a factory replacement and fitment should be double-checked against your LaCrosse's part number before ordering. Expect typical injector-level benefits — smoother idle, restored throttle response, and reduced emissions — if the cause of drivability issues is worn or clogged injectors.
Best for: Risk-averse mainstream buyers looking to restore dependable day-to-day performance and emissions on a Buick LaCrosse without experimenting with high-performance upgrades.
Less Ideal for: Enthusiasts seeking performance-tuned injectors or buyers who prefer only factory-brand parts should look elsewhere.
- Sold as a matched six-pack so all cylinders can be replaced together for consistent flow
- Claims improved sealing and internal protection to reduce sticking and support reliable cold starts
- Designed to produce an accurate fuel spray pattern for better vaporization and throttle response
- Aftermarket part from a third-party brand rather than a factory-quality OEM unit
- Fitment requires verifying the part number against your vehicle before purchase
Verdict A convenient six-pack aftermarket replacement that can restore fuel delivery on a Buick LaCrosse when fitment is confirmed, but it is not a factory-branded injector.
6. A-Premium Fuel Injectors 6‑Piece Set for Buick LaCrosse/Cadillac 3.6L
| Engine fitment | 3.6L Buick LaCrosse (mid-2000s) |
|---|---|
| Terminal type | Blade, 2 terminals |
| Static flow | 119 ml/30s |
| Dynamic flow | 13 ml/30s |
These A-Premium injectors are a budget-focused replacement set intended to restore proper fuel spray and engine performance on 3.6L Buick LaCrosse models. Installed as direct replacements, they are used to replace leaking or clogged factory injectors and are meant to improve idle smoothness, throttle response, and fuel economy by restoring correct atomization. Notable features listed include a 2-terminal blade connector and specified static and dynamic flow figures that indicate flow matching for the engine. Buyers can expect included gaskets and a straightforward swap for mechanically competent DIYers or a local shop, which keeps labor costs low. Quality and longevity vary in user reports: several owners report clear improvements in drivability and mileage, while a minority experienced early failures, so results are not uniformly long-term. The product carries a one-year unlimited-mileage guarantee from the brand. If you want an economical way to get a LaCrosse running well again without paying dealer prices, these injectors deliver usable performance, but they may not match factory longevity on every vehicle.
Best for: Practical optimizers who want an affordable, full-set repair to restore drivability and fuel economy on a mid-2000s Buick LaCrosse without paying dealer prices.
Less Ideal for: Drivers seeking a factory-identical, long-life replacement or those who prefer performance-tuned injectors should consider higher-grade or OEM-equivalent options.
- Sold as a complete 6-piece set for the 3.6L engine so all cylinders can be serviced at once
- Designed with blade-style 2-terminal connectors for direct electrical compatibility with factory harnesses
- Documented static and dynamic flow values help with matching and restoring consistent fuel delivery
- Includes gaskets and fits mid-2000s GM 3.6L applications, simplifying DIY installation
- Mixed longevity reports among users, with some early failures documented
- Not a branded OEM part so long-term durability may vary compared with factory-quality injectors
Verdict A cost-conscious full set that can quickly restore LaCrosse drivability and gas mileage, but expect variable long-term durability compared with factory-quality injectors.
7. NECATUO Set of 6 Fuel Injectors (replaces 12634126, FJ1157)
| Manufacturer Part Number | NEC-PYZ2-6P-FJ1157 |
|---|---|
| OEM Part Number | 12634126, 12642128, FJ1157 |
| Brand | NECATUO |
| Item Weight | 2.11 ounces |
This NECATUO six-pack replaces part number 12634126 (FJ1157) and is intended as a direct-fit fuel injector kit for Buick LaCrosse applications that use that injector. The set installs like a factory-replacement unit and is used to restore even fuel delivery when symptoms such as rough idle, poor acceleration, or loss of power point to failing injectors. The injectors use corrosion-resistant composite bodies and high-temperature viton O-rings to improve durability and sealing compared with generic components. Practical benefits include matched injectors sold together so you swap the whole bank at once and avoid mixing old and new flow characteristics, plus one-year support from the maker. Limitations to be aware of are variable quality control reported by some users and occasional O-ring issues that can require replacement or professional attention; some vehicles may need fuel trims or tuning after installation if the flow characteristics differ slightly from factory units. For a balanced buyer wanting a cost-effective, full-bank replacement for a Buick LaCrosse, this kit is a practical alternative to an expensive factory replacement if you accept the small risk of unit variability.
Best for: Buyers who want a balanced, cost-conscious full-bank replacement for a Buick LaCrosse and prioritize restoring reliable drivability without paying for new factory injectors.
Less Ideal for: Drivers seeking guaranteed factory-original performance or those who cannot tolerate any risk of receiving a defective unit should consider factory-quality replacements or professional remanufactured injectors instead.
- Sold as a matched six-injector kit for whole-bank replacement.
- Designed to replace part number 12634126 (FJ1157) for direct fit on compatible Buick LaCrosse engines.
- Corrosion-resistant composite construction and high-temp viton O-rings for improved durability.
- Includes one-year customer support from the manufacturer.
- Some customers report inconsistent quality control with occasional faulty injectors.
- O-rings on a portion of units have required replacement or re-sealing by a mechanic.
Verdict A budget-friendly matched six-injector kit that fits Buick LaCrosse engines using 12634126, offering solid value if you accept some variability in quality.
Choosing the Right Buick LaCrosse Fuel Injector: Key Factors to Consider
Correct Fitment And Connector Type
Correct mechanical and electrical fitment is essential because injectors must mate precisely with the rail, intake, and wiring harness. A direct-fit injector minimizes installation time and reduces the risk of leaks or poor electrical contact. Incorrect connectors or mounting dimensions can cause poor sealing, fuel smell, or intermittent electrical faults.
Confirming fitment avoids modification work such as adapter harnesses or machining, which can add complexity and introduce new failure points. For a Buick LaCrosse, prioritize injectors specified for that model and engine code to ensure the connector, o-ring sizes, and physical length match factory specifications.
Flow Rate And Calibration
Flow rate determines how much fuel the injector delivers at a given pulse width, which affects air/fuel ratio and engine tuning. Mismatched flow rates can lead to lean or rich conditions, causing poor fuel economy, increased emissions, or drivability issues. Consistent flow between all injectors is also important to maintain smooth running across cylinders.
When replacing injectors, check the specified flow in cc/min or lb/hr and whether the part is intended as an OEM-equivalent. If the engine has been modified, you may need a different flow rate, but for stock applications matching factory flow is usually best to avoid retuning the engine control system.
Spray Pattern And Atomization
The spray pattern and atomization quality influence combustion efficiency and emissions. A well-atomized spray creates a fine fuel mist that mixes thoroughly with intake air and promotes complete combustion. Poor atomization can cause rough idle, increased deposits, and higher exhaust emissions.
Look for injectors with a spray pattern that matches the intake port geometry and combustion chamber design. Manufacturers often publish spray characteristics; choosing an injector with appropriate atomization helps maintain smooth throttle response and consistent power delivery.
Seal Quality And Resistance To Leaks
Injector seals and o-rings prevent fuel leaks and maintain correct fuel pressure. Degraded or incompatible seals can lead to fuel smell, dampness around the intake, or pressure loss that affects engine performance. Materials that resist heat, fuel additives, and ozone will last longer in the engine bay environment.
Inspect seal material compatibility and whether replacement o-rings are included. For installations on older cars, replacing o-rings at the same time reduces the chance of future leaks and simplifies maintenance.
Durability And Clogging Resistance
Fuel injectors can fail prematurely from internal clogging due to deposits, contaminants, or inadequate filtration. Durable injectors use materials and internal tolerances that resist buildup and hold calibration over time. Some designs incorporate internal filters or diagnostic-friendly features that make service easier.
Consider how often the vehicle sees short trips or low-quality fuel, as those conditions increase deposit risk. Choosing an injector with proven resistance to clogging reduces the likelihood of recurring issues and extends service intervals.
Electrical Characteristics And Testing Data
Electrical properties such as coil resistance and response time affect injector control and compatibility with the vehicle's fuel injection system. If resistance is out of spec, the engine control module may not pulse the injector correctly, causing misfires or compensation errors. Manufacturers or suppliers that provide electrical specifications and testing data make it easier to verify compatibility and diagnose issues.
Whenever possible, obtain injectors with documented resistance, leakage current, and performance test results. That information helps technicians confirm correct operation after installation and reduces troubleshooting time if problems arise.
FAQ
How do I know if a Buick LaCrosse fuel injector is failing?
Symptoms often include rough idle, hesitation under acceleration, and difficulty starting. You may also notice increased fuel smell, reduced fuel economy, or an engine misfire code. Diagnosis usually combines visual inspection, listening for injector operation, and testing fuel delivery or resistance.
Can I replace a single injector or should I replace them all at once?
Replacing one injector can fix a localized problem, but uneven flow between new and older injectors can affect balance. If other injectors have high mileage or show signs of wear, replacing multiple at once reduces the chance of repeated labor and helps maintain consistent performance across cylinders.
Is fuel injector cleaning effective for resolving issues?
Cleaning can restore performance when deposits are the main issue. Professional cleaning or targeted chemical treatments often improve spray pattern and flow. However, cleaning will not fix injectors with electrical faults, internal leaks, or worn internal parts, so testing should guide whether cleaning or replacement is appropriate.
What tests confirm an injector is bad?
Common checks include measuring coil resistance to see if it falls within the specified range, inspecting for external leaks, and using a flow test or noid light to verify pulsed operation. Smoke, audible imbalance using a mechanic's stethoscope, and diagnostic trouble codes also help pinpoint injector problems.
Do injector leaks show specific symptoms?
Leak symptoms can include a detectable fuel odor, visible wetness around the injector or intake, and rough running due to fuel pressure loss. A persistent leak can also trigger rich-running codes or fouled spark plugs, so visual inspection and pressure testing help confirm leaks.
Will upgrading injectors improve performance?
Upgrading to higher-flow or differently tuned injectors can support engine modifications that demand more fuel, but benefits depend on matching the injector to the engine's tuning. For a stock engine, changing injector characteristics without proper calibration can cause drivability issues, so upgrades usually require consideration of flow, spray pattern, and engine management.
How We Chose the Best Buick LaCrosse Fuel Injector
We focused on injectors that meet correct electrical and mechanical fitment for the Buick LaCrosse and that specify compatible flow rates for the engine applications common to this car. Key evaluation criteria included exact vehicle fitment and connector type, measured or specified flow precision and consistency, construction materials and seal quality that affect longevity, and manufacturer specifications for spray pattern and atomization. We also considered resistance to common failure modes such as clogging and leakage, plus availability of OEM-equivalent or direct-fit mounting hardware. We excluded universal or non-specific nozzle kits and any items lacking clear fitment data for the Buick LaCrosse. The resulting short list reflects parts that align with the car's factory requirements and buyer concerns about reliability, drivability, and serviceability.
Our full evaluation process is outlined in our review methodology.
Conclusion
When selecting a Buick LaCrosse fuel injector, prioritize correct fitment, matching flow rate, and reliable sealing to preserve drivability and fuel control. Balance spray pattern and durability against your maintenance habits and any engine modifications. Addressing electrical specs and clogging resistance up front reduces the chance of repeat service. Use the factors outlined here to pick an injector that fits the car and your expected use, and consider replacing seals or testing old injectors before installation.
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