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If you drive a Buick LaCrosse, the intake manifold plays a big role in how smoothly your engine breathes and how reliably it runs. Choosing the right intake manifold affects throttle response, fuel distribution, and long-term sealing against vacuum and coolant passage issues. This guide highlights seven shortlisted intake manifolds that stood out for fitment, build quality, and sealing performance. We evaluated each option on material, compatibility with stock components, and expected durability to help you narrow the choices. Read on for the criteria we used and what to look for when selecting the best fit for your LaCrosse.
Looking for other parts? See all Buick LaCrosse parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | AM Autoparts Intake Manifold (AM-469358101) compatible with 2.4L Buick/GM 4‑cylinder models |  |
| Best Quality Built to a higher standard if you want something more solid | GM Genuine Parts 12638038 Intake Manifold Assembly |  |
| Best Value The sweet spot between price and what you get | GM Genuine Parts Intake Manifold Kit (12637620) with Seals, Gasket, Sensor, and Bolts |  |
| Best Budget The cheapest option that still gets the job done reliably | NEWZQ Replacement Intake Manifold with Gasket for 2.4L L4 (fits Buick LaCrosse, Regal, Chevy Malibu, Pontiac G6, Saturn Aura) |  |
| Highest Rated A top-rated pick with lots of positive feedback | GM Genuine Parts 12639087 Intake Manifold Assembly |  |
| Most Popular A crowd favorite that many people choose with confidence | TRQ Intake Manifold (Model IMA07929) Compatible with Buick LaCrosse and 2.4L GM Engines |  |
| Best Seller A high-volume bestseller chosen again and again | A-Premium Intake Manifold for 2.4L 4‑Cylinder Engines |  |
1. AM Autoparts Intake Manifold (AM-469358101) compatible with 2.4L Buick/GM 4‑cylinder models
| Material | Plastic |
|---|---|
| Gasket Or Seal Included | Yes |
| Compatible Engine | 2.4L L4 |
| Manufacturer | AM Autoparts |
This AM Autoparts intake manifold is a direct-replacement style unit made of engineered plastic and supplied with gaskets to simplify installation. It fits 2.4L inline-4 GM applications such as Buick LaCrosse (including Hybrid) and related Chevrolet and GMC models, and is intended to replace the factory manifold without modification. Typical use is a like-for-like repair when the original manifold is cracked, leaking, or warped; the pre-assembled design and included seal reduce installation guesswork and speed up a routine engine repair. The plastic construction keeps weight down and resists corrosion compared with metal alternatives, while compatibility across multiple 2.4L variants makes it a convenient choice for shops and DIYers working on family sedans and crossovers. Important limitations are that this is a vehicle-specific replacement for the 2.4L L4 family so fit must be confirmed for your exact year and trim, and plastic manifolds can be less tolerant of extreme heat cycling than heavier-duty aftermarket metal options.
Best for: Balanced buyers who want a straightforward, factory-style replacement for a 2.4L Buick LaCrosse without chasing OEM parts and who value ease of installation and broad compatibility.
Less Ideal for: Buyers seeking heavy-duty or performance upgrades or those with non-2.4L engines should look at specialized aftermarket or vehicle-specific options instead.
- Designed as a direct-fit replacement to simplify installation
- Includes gasket or seal to reduce additional parts purchases
- Plastic construction resists corrosion and reduces weight
- Compatible with a broad range of GM 2.4L L4 applications including Buick LaCrosse variants
- Limited to GM 2.4L inline-4 applications so not universal across other engines
Verdict: A practical, direct-fit intake manifold replacement for 2.4L Buick LaCrosse owners who want a simple, factory-style swap.
2. GM Genuine Parts 12638038 Intake Manifold Assembly
| Manufacturer | ACDelco |
|---|---|
| Brand | GM GENUINE PARTS |
| Model | Manifold |
| Exterior | Machined |
This GM Genuine Parts intake manifold is a factory-style replacement designed to restore intake airflow and fitment to GM V8 applications. It installs like a stock manifold and is typically used when repairing or rebuilding an engine where factory fit and long-term durability matter. The machined exterior and GM validation mean port alignment and mounting points match factory locations, which reduces installation fuss and the need for aftermarket adapters. Buyers will appreciate that the manifold already accommodates a 3-bar MAP sensor opening on some variants and moves more air than older or worn cast manifolds. Important limitations are that several small hardware items are not supplied, for example the MAP sensor retainer clip, throttle body o-ring, and certain vacuum fittings, so plan to source those separately. This is not a performance-ported aftermarket manifold, so gains beyond restoring stock flow are limited without additional tuning or porting work.
Best for: Performance-oriented owners seeking a high-quality, factory-correct intake to restore reliable airflow and fit while preserving drivability and long-term durability.
Less Ideal for: Buyers looking for a bolt-on performance intake with larger aftermarket ports or significant flow gains should consider purpose-built aftermarket manifolds instead.
- Factory-validated fit reduces installation alignment issues
- Machined exterior and factory design for consistent porting and sealing
- Supports 3-bar MAP sensor on applicable units without adapter
- Durable, OEM-style construction intended for long service life
- Does not include small installation items such as MAP retainer clip, throttle body o-ring, or some vacuum fittings
Verdict: A factory-quality GM intake manifold that restores stock-fit airflow and durability for performance-focused engine builds.
3. GM Genuine Parts Intake Manifold Kit (12637620) with Seals, Gasket, Sensor, and Bolts
| Manufacturer | ACDelco |
|---|---|
| Brand | GM GENUINE PARTS |
| Model | Intake Manifold Kit |
| Item model number | 12637620 |
This GM Genuine Parts intake manifold kit is a direct-fit replacement designed to restore proper air and fuel distribution to the intake ports on compatible GM engines. Intended for repair and routine maintenance, the kit ships with the manifold plus the necessary gaskets, sensor and mounting hardware so you can replace the failed component without sourcing separate parts. Being a GM Genuine Parts item, it is manufactured to factory specifications for fit, form, and function which simplifies installation and reduces the chance of fitment issues when used on the intended vehicle. In practical use the unit helps recover engine performance, idling smoothness, and fuel delivery consistency after a leaking or cracked manifold is replaced. Limitations are typical of direct-replacement OE parts: it is vehicle-specific so confirm fitment for your Saturn Vue engine before purchase and professional installation may be required if you lack mechanical experience.
Best for: Risk-averse mainstream buyers seeking a factory-quality, direct-replacement intake manifold kit that minimizes fitment uncertainty and reduces the need for aftermarket part sourcing.
Less Ideal for: Buyers looking for performance-tuned or universal intake upgrades should consider aftermarket performance manifolds instead of this factory replacement.
- Factory-quality design engineered to GM specifications for reliable fit and function
- Includes gaskets, sensor, seals, and mounting bolts to complete the repair in one kit
- Restores proper air/fuel distribution to improve idle stability and performance
- Vehicle-specific fitment requires confirmation for Saturn Vue engine variants before buying
Verdict: A complete, factory-quality intake manifold kit that simplifies replacement and restores factory performance for compatible GM engines.
4. NEWZQ Replacement Intake Manifold with Gasket for 2.4L L4 (fits Buick LaCrosse, Regal, Chevy Malibu, Pontiac G6, Saturn Aura)
| Brand | NEWZQ |
|---|---|
| Model | 12615133 12643496 |
| Exterior | Machined |
| Manufacturer Part Number | 12615133 12643496 |
This NEWZQ intake manifold is a direct replacement designed for 2.4L L4 GM engines found in Buick LaCrosse and related models. It is supplied as a machined manifold and includes the gasket set referenced by common OEM numbers, making it suitable for routine engine repairs and rebuilds. Typical use is straightforward: remove the failed manifold, transfer any required sensors or hardware, and install this unit to restore intake sealing and airflow. The machined exterior suggests consistent surface finish for mating surfaces, and multiple customer reports indicate straightforward fitment on compatible years. As a budget-focused aftermarket part, it provides a low-cost path to getting the vehicle back on the road but may not match higher-end performance or longevity of premium factory-quality replacements. Installers should inspect mating surfaces and fasteners and consider replacing any worn sensors or bolts during the job to ensure a reliable seal. This unit is best for cost-conscious repairs where affordability is the priority rather than long-term performance upgrades.
Best for: Budget-conscious owners who prioritize low repair cost and need a straightforward replacement to restore engine function rather than improve performance.
Less Ideal for: Drivers seeking upgraded flow, increased longevity, or performance gains should consider higher-end or performance-oriented manifolds instead.
- Made as a direct replacement for 2.4L L4 GM applications for straightforward fitment.
- Includes gasket compatibility with common OEM part numbers for easier installation.
- Machined exterior finish for consistent mating surfaces and improved seal potential.
- Low-cost option that reduces repair bills compared with higher-priced aftermarket or factory parts.
- Aftermarket construction may not match long-term durability of premium factory-quality manifolds.
Verdict: A low-cost, direct-fit replacement intake manifold and gasket kit that gets 2.4L GM engines back on the road without breaking the budget.
5. GM Genuine Parts 12639087 Intake Manifold Assembly
| OEM Part Number | 12639087 |
|---|---|
| Model | Intake Manifold Assembly |
| Exterior | Machined |
This GM Genuine Parts intake manifold is a direct-fit replacement engineered to the same standards used by General Motors and intended to restore proper air delivery and sealing on compatible engines. It is typically used when a cracked, warped, or leaking intake manifold causes vacuum leaks, rough idle, reduced power, or coolant intrusion. Notable features include factory-spec design and manufacturing, machined exterior surfaces for reliable sealing, and GM validation that aligns fit, form, and function with the original component. In practice the part simplifies installation compared with aftermarket universal options because it matches mounting points and passages, which reduces the need for modifications. The main practical benefit is peace of mind from using a part backed by the vehicle maker that should return the engine to expected drivability and emissions performance. The product is a direct replacement rather than a performance upgrade, so buyers seeking power gains or modified flow characteristics will need a different component.
Best for: Reliability-focused owners who prioritize restoring factory performance and longevity with a vehicle-maker validated replacement rather than aftermarket modifications.
Less Ideal for: Buyers seeking increased horsepower or custom intake flow tuning should consider performance-oriented aftermarket manifolds instead.
- Factory-quality design and manufacturing validated by General Motors
- Direct-fit replacement that matches factory mounting points and passages
- Machined exterior surfaces to help ensure reliable sealing and fit
- Restores factory drivability, emissions behavior, and sealing where originals fail
- Not designed for performance gains or increased airflow compared with aftermarket performance manifolds
- Requires correct fitment checking to ensure compatibility with specific Saturn Vue engine variants
Verdict: A factory-validated intake manifold that restores original fit and drivability for GM-compatible engines.
6. TRQ Intake Manifold (Model IMA07929) Compatible with Buick LaCrosse and 2.4L GM Engines
| Brand | TRQ |
|---|---|
| Model | TRQ IMA07929 Intake Manifold |
| Material | Plastic |
| Gasket Included | Yes |
| Reference Number | 12637620 |
This TRQ intake manifold is a replacement, pre-assembled plastic manifold intended to restore airflow for 2.4L GM four-cylinder engines found on Buick LaCrosse and several related models. It installs as a direct replacement and ships with the gasket included, which simplifies a DIY swap and reduces shop time for routine repairs. The machined exterior and reinforced construction many reviewers note give it a more robust feel than the cheapest aftermarket units, and TRQ provides installation videos and compatibility guidance to help convenience-minded buyers. Some customers report reliable fit and quieter operation initially, while a few others have experienced internal baffling failures over extended use, so long-term durability varies by application. Installation may require relocating sensors and following TRQ guidance, but for routine maintenance or replacing a failing factory manifold this unit offers a convenient, ready-to-fit option that gets the vehicle back on the road quickly.
Best for: Convenience-driven buyers who want a ready-to-install, direct-replacement manifold that minimizes shop time and lets experienced DIYers or quick-service shops complete the repair with minimal fuss.
Less Ideal for: Drivers seeking a heavy-duty or performance-upgraded manifold for sustained high-load use should consider purpose-built metal options or performance-specific parts instead.
- Pre-assembled direct-fit design simplifies DIY installation and saves time
- Includes gasket to avoid sourcing a separate seal during replacement
- Machined exterior and reinforced construction improve perceived build quality
- TRQ provides fitment guidance and instructional videos for easier installation
- Made of plastic so long-term durability may vary compared with metal alternatives
- Some users reported internal baffle failure and rattling after extended use
Verdict: A convenient, direct-fit replacement manifold that simplifies a DIY or quick-service swap for 2.4L Buick LaCrosse engines.
7. A-Premium Intake Manifold for 2.4L 4‑Cylinder Engines
| Vehicle fitment | Buick LaCrosse L4 2.4L (covered model years) |
|---|---|
| Includes | Sensor, seal and nuts |
| Reference numbers | 12637620, 12651992, 12637193 |
This A-Premium intake manifold is a direct replacement intended for GM 2.4L four-cylinder engines, including fitment for the Buick LaCrosse model years covered by the 2.4L lineup. It supplies the engine with the air path previously handled by the factory manifold and includes the sensor, seal and mounting nuts needed for installation. The interior surfaces are smoothed to promote steadier airflow and reduce turbulence, which can improve throttle response compared with a rough cast replacement. Buyers report it matches factory fit and can be used during routine repairs or when the original manifold has carbon buildup or PCV-related clogging. There are mixed quality reports: many users find it performs well out of the box, but some have experienced sealing issues or fragile purge ports that required repair. Installation on a LaCrosse is a moderate job that can involve removing the fuel rail and related components, so plan for time and care. For owners seeking a lower-cost replacement that aims for factory-style performance, this part is a practical option if inspected carefully before final installation.
Best for: Risk-averse mainstream buyers who prioritize restoring factory behavior at a lower cost than dealer parts and prefer a straightforward replacement for routine repairs on a Buick LaCrosse.
Less Ideal for: Owners seeking a premium performance upgrade or guaranteed long-term durability without inspection should consider OEM or higher-end aftermarket options instead.
- Designed to fit GM 2.4L 4-cylinder applications including Buick LaCrosse for direct replacement fitment
- Ships with sensor, seal and mounting nuts to simplify installation
- Smoother inner runner surfaces intended to improve airflow and reduce intake turbulence
- Multiple user reports of good fit and function comparable to factory-quality replacements
- Some units have reported sealing problems around central bolt area leading to vacuum or oil leaks
- Plastic purge/connector ports have been reported to break on handling by several buyers
- A few users noted manufacturing defects requiring minor modification before use
Verdict: A cost-conscious, factory-style replacement for the LaCrosse 2.4L that can restore airflow and function if inspected for seal and purge-port quality before final installation.
Choosing the Right Buick LaCrosse Intake Manifold: Key Factors to Consider
Vehicle-Specific Fitment
A correct fit ensures the manifold aligns with intake ports, mounting studs, and sensor locations. For the Buick LaCrosse, matching the manifold to the engine variant and production year avoids gaps that cause vacuum leaks and poor sealing.
Poor fitment often results in leakage at critical interfaces and can complicate sensor connections. Verify bolt pattern, throttle-body flange type, and spacing for vacuum lines before choosing a manifold to reduce installation time and rework.
Material And Manufacturing Quality
Materials like high-grade aluminum or reinforced composites resist warping and corrosion under thermal cycles. A consistently machined intake flange and well-formed runner walls support smooth airflow and help maintain an even seal with the head.
Manufacturing tolerances affect port alignment and surface flatness. Look for manifolds with documented machining processes or quality control notes, since better fabrication reduces the risk of leaks and premature failure.
Gasket Interface And Sealing Design
The mating surface design and the type of gasket provided determine long-term sealing reliability. A robust gasket interface accommodates minor surface imperfections and maintains a seal under changing temperatures and vibration.
Consider whether the manifold uses integrated sealing beads, dedicated gasket channels, or requires aftermarket gaskets. Proper sealing design also reduces the chance of coolant or vacuum cross-contamination and simplifies future replacement.
Compatibility With Sensors And Vacuum Lines
Intake manifolds must accommodate mass airflow, MAP, EGR, and other sensor ports, along with vacuum fittings. Manifolds that keep factory sensor locations and vacuum routing intact reduce the need for splicing or adapters.
Ensure all necessary ports are present and accessible for routine diagnostics. Retaining original vacuum pathways helps prevent drivability issues related to incorrect manifold pressure readings.
Ease Of Installation And Maintenance
Features such as clearly marked bolt locations, accessible mounting hardware, and well-documented torque guidance make installation smoother. Manifolds that allow straightforward access for gasket replacement or cleaning save time during routine service.
Consider how the manifold interfaces with surrounding components, whether special tools are required, and whether the design allows for safe cleaning of carbon buildup without full removal when applicable.
Thermal And Flow Characteristics
Runner shape, plenum volume, and surface finish influence airflow distribution and how the engine responds across the rev range. Materials and design that manage heat transfer help avoid hotspots and reduce the risk of warping.
Think about whether you prioritize steady low-end torque, high-rpm power, or a balanced response. The manifold should support the engine's intended operating characteristics while maintaining stable temperatures and consistent flow to all cylinders.
How We Chose the Best Buick LaCrosse Intake Manifold
We focused on attributes that most directly affect installation success and in-service reliability for Buick LaCrosse intake manifolds. Key criteria included precise vehicle fitment and bolt pattern alignment, material and manufacturing quality to resist warping and corrosion, gasket interface design and sealing surface finish, and compatibility with factory sensors and vacuum lines. We also weighed ease of installation, documented torque specifications or guidance, and the availability of clear mounting and vacuum port layouts.Products were excluded if they lacked clear fitment information for the Buick LaCrosse, did not provide adequate sealing detail for coolant or vacuum passages, or required extensive modification to mating components. We prioritized manifolds that minimize the need for additional adapters and that support routine maintenance such as cleaning and gasket replacement. The final list reflects items that balance reliable sealing, durable construction, and straightforward fitment for typical LaCrosse installations.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I tell if my Buick LaCrosse intake manifold is failing?
Common signs include rough idle, poor acceleration, or unexplained vacuum-related codes. You may also notice coolant contamination in the intake or repeated coolant loss without an obvious external leak. These symptoms often warrant a focused inspection of the manifold and its gasket surfaces.
Can I clean an intake manifold instead of replacing it?
Cleaning can help if the issue is carbon buildup or minor deposits on the runners and plenum. However, cleaning will not fix warped flanges, cracked passages, or compromised gasket surfaces. Inspect sealing faces and internal passages to determine whether cleaning or replacement is the appropriate solution.
What role do torque specs play when installing an intake manifold?
Correct torque on mounting bolts ensures even clamping of the gasket and prevents warping of the manifold flange. Following the proper torque sequence and values reduces the chance of vacuum leaks and uneven sealing. If torque specs are not provided, consult vehicle-specific documentation to avoid over- or under-tightening.
How can I diagnose an intake manifold vacuum leak?
Start with a visual inspection for cracked hoses, loose fittings, or damaged gasket surfaces. A smoke test or using a handheld vacuum gauge can help locate leaks in hard-to-see areas. Listening for hissing noises under operating conditions and checking for inconsistent idle or fuel trims can also point to a vacuum leak.
Are performance-focused intake manifolds worth considering?
Performance manifolds can alter airflow characteristics to favor higher rpm power or improved throttle response, but they may change low-end drivability and require supporting modifications. Consider your driving goals and whether the manifold preserves necessary sensor and vacuum connections before choosing an upgraded design.
Conclusion
When selecting a Buick LaCrosse intake manifold, prioritize accurate fitment, robust sealing at the gasket interface, and material quality that resists heat and distortion. Balance airflow characteristics with the engine's intended use and make sure the manifold maintains factory sensor and vacuum connections.Accept that tradeoffs exist between ease of installation, long-term durability, and any performance-oriented shaping of the runners. Use the factors outlined here to weigh those tradeoffs and choose the option that best matches your installation preferences and driving goals.
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