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Throttle Body Assembly
The throttle body assembly is the air metering valve between the intake tubing and the intake manifold. It controls how much air the engine draws in based on accelerator input and is electronically actuated on most modern vehicles.
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Buying Guide
Throttle Body Assembly Buying Guide
The air intake and fuel delivery system controls how air and fuel reach the engine. These parts work as a system — understanding how they connect helps you diagnose and buy correctly.
The air cleaner housing holds the engine air filter and mounts to the intake ducting. When the housing is cracked or broken, unfiltered air bypasses the element. The housing is vehicle-specific but typically straightforward to replace. Not included: the filter element itself — always install a fresh filter when replacing the housing.
The MAF sensor measures incoming air volume so the ECM can calculate the correct fuel dose. Symptoms of a failing MAF include rough idle, poor fuel economy, and hesitation under load. MAFs are often cleaned rather than replaced — use dedicated MAF cleaner spray before condemning the sensor. If buying used, ensure it's the correct part number for your engine variant (the same vehicle may have different MAF calibrations across engine options).
The throttle body meters airflow based on accelerator input. Common failure modes include carbon buildup (causing erratic idle) and a failed throttle position sensor (TPS). Many throttle bodies can be cleaned rather than replaced. If buying used, confirm the throttle plate moves freely and the TPS connector is intact. Some modern drive-by-wire throttle bodies require a relearn procedure after installation.
The intake manifold distributes air (or air-fuel mixture on carbureted engines) evenly to each cylinder. Plastic manifolds crack at EGR ports or coolant crossovers; aluminum manifolds warp at the gasket surface. When replacing, always use new gaskets. Not included: gaskets, EGR valve, fuel injectors, throttle body, or vacuum fittings — plan to transfer or replace these.
Fuel injectors atomize fuel directly into the intake port or cylinder. When buying used injectors, request flow test data or have them professionally tested and cleaned before installation. Match the injector impedance (high or low) and flow rate to your application. Related fuel injector parts include fuel rails, injector seals and O-rings, and clips — always replace seals when reinstalling injectors. Individual injectors are sometimes swapped; a full set ensures balanced fuel delivery.
On pre-fuel-injection vehicles, the carburetor handles both air metering and fuel delivery. Used carburetors are a viable option but should be rebuilt with a carburetor kit before installation — internal rubber components (needle valves, power valve, accelerator pump) degrade with age and ethanol exposure. Confirm the carburetor matches your engine's CFM requirement and mounting flange bolt pattern.
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ShopEarl.com is a network of American auto part suppliers - salvage yards, aftermarket vendors, and powertrain remanufacturers.
Our mission is to make finding the right auto part easy, affordable, and environmentally friendly by giving quality used parts a second life and keeping them out of landfills.
We use a comprehensive vehicle fitment database that matches parts to specific makes, models, years, and engine types.
For critical components like engines and transmissions, we also require VIN verification for your vehicle to ensure an exact match. The VIN (Vehicle Identification Number) contains specific information about your vehicle's configuration that helps identify the exact parts it needs.
If you're ever unsure about fitment, our team is available to help verify compatibility before you make a purchase.
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All payment data is encrypted using TLS technology. We never see or store your full payment information—only a secure token provided by our processor to complete your purchase.
ShopEarl.com offers free shipping within the continental United States. Shipping times can vary depending on shipping methods, and ‘unbolted’ used parts typically ship a day faster than ‘yard’ parts that have to be professionally dismantled from the vehicle first. You’ll receive email and text notifications every step of the way.
Delivery to commercial locations is always free, but larger parts that ship freight may incur surcharges if they are delivered to a residential address. You can always ship these for free to a repair facility or our team can help find a nearby commercial address for local pickup.
At the moment, we don’t offer expedited shipping options. However, we’re always looking for ways to improve our services, and we hope to offer faster shipping options in the future.
All parts come with a minimum 30 day return window from the date your part arrives. See full return policy for all the details.
A core charge is a refundable fee charged when you buy a part that can be rebuilt or remanufactured, like an engine, alternator, or transmission. It works like a deposit:
- You pay the core charge upfront when you buy the part.
- After installing the new part, you return the old part (the “core”) to the seller.
This system encourages recycling and helps manufacturers refurbish used parts instead of making new ones from scratch.
Used parts are OEM auto parts professionally dismantled by certified auto recyclers.
Remanufactured parts are used OEM parts that have been completely disassembled, cleaned, and rebuilt with new components where necessary. They're tested to meet or exceed original equipment specifications, and often come with warranties similar to new parts.
New parts are new, aftermarket components that have never been installed on a vehicle.