Katerina Swanson
Fuel injectors are an important component of a car's engine, and choosing the right ones is crucial to ensure the engine runs smoothly and efficiently. While bigger fuel injectors might seem like they would provide more power, it's important to ensure your engine is set up to handle the extra fuel to avoid flooding the engine and causing damage. The difference between 98 and 99-00 fuel injectors lies in their compatibility with specific engines and their ability to meet the engine's fuel requirements. Understanding the factors that determine the right fuel injectors, such as engine setup and horsepower expectations, is essential for making the right choice between 98 and 99-00 fuel injectors.
Differences between 98 and 99 00 fuel injectors
| Characteristics | Values |
|---|---|
| Air injection | 99-00 has air injection, which can be identified by the big nipple at the top of the mounting surface. |
| Mating surface | The mating surface of 99-00 is larger. |
| Vacuum leaks | The 99-00 IM has an air injection feature that causes vacuum problems when used with a 98-96 head unless the holes are plugged. |
| Gasket | The gaskets of 99-00 and 98-96 are different. |
| Headlights | The 99-00 headlights are different from the 98-96 headlights. |
| Bumper | The 99-00 bumper has one smaller opening in the middle and two mock openings on the sides under the headlights, while the 98-96 bumper has one big opening. |
| Injector size | The 99-00 injectors are 240cc/min. |
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What You'll Learn
The 99-00 front bumper is different around the headlights
The 99-00 front bumper has a distinct design around the headlights, setting it apart from the 96-98 model. Specifically, the 99-00 version features one smaller opening in the centre of the bumper and two mock openings on the sides beneath the headlights. In contrast, the 96-98 model sports a single large opening in the bumper cover. This variation in design lends a unique look to the 99-00 model, requiring the purchase of new headlights to complete the conversion to the newer model.
The differences between the 99-00 and 96-98 models extend beyond the headlights and bumper. The 99-00 front end boasts a distinct radiator support, although modifying the radiator support on the 96-98 model can make it compatible. The fenders, hood, and grill also exhibit subtle variations in shape, contributing to the cosmetic distinctions between the two versions.
While the 99-00 and 96-98 models share similarities in certain part numbers, such as the head part numbers, there are notable disparities in the gaskets. The 99-00 model incorporates an air injection feature, which can lead to vacuum problems when paired with the 96-98 head unless the injection holes are plugged. Conversely, utilising a 99-00 head with a 96-98 IM is less problematic, as it only requires gaskets from both models to be combined.
In terms of fuel injectors, the 99-00 injectors are 240cc/min, while the 01+ variants are 255cc/min. This minor difference in size may not be significant enough to impact performance noticeably. However, it's worth noting that installing larger injectors without the necessary engine modifications can lead to issues such as flooding the engine and causing it to run too rich, potentially damaging the engine.
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The 99-00 has a different vacuum setup
The 99-00 fuel injectors have a different vacuum setup from the 96-98 fuel injectors. The 99-00 IM has an air injection feature that causes vacuum problems when used with a 96-98 head unless you plug the holes. The 99-00 gasket has an air injection hole that goes directly into the injectors. The 99-00 fuel injectors are also larger, with a capacity of 240cc/min compared to the 01+ injectors, which have a capacity of 255cc/min.
The 99-00 fuel injectors have a different shape than the 96-98 injectors. The mating surface of the 99-00 injectors is larger and has a nipple at the top of the mounting surface, while the 96-98 injectors have a smaller, less square mating surface without a nipple. The 99-00 fuel injectors also have air injection holes by the fuel injection at the end of the runners, which can cause vacuum leaks if not plugged.
The 99-00 fuel injectors are a direct plug-and-play option, and your ECU will be able to handle the small change. However, it is important to note that the 99-00 fuel injectors may not be compatible with all vehicles. For example, when used with a 96-98 head, the 99-00 IM can cause vacuum leaks unless the injection holes are plugged.
Overall, the main difference between the 98 and 99-00 fuel injectors is the vacuum setup, with the 99-00 injectors having an air injection feature that can cause vacuum leaks when used with certain heads.
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The 99-00 has air injection in the intake manifold
The 99-00 fuel injectors have air injection in the intake manifold, which is the only real difference between them and the 96-98 fuel injectors. This feature is designed to feed air into the injectors to help with emissions. The 99-00 IM gasket has a larger mating surface and air injection holes by the fuel injection at the end of the runners by the injectors. If these are not plugged, it will cause a vacuum leak.
The 99-00 injectors are 240cc/min, while the 01+ are 255cc/min. The 99-00 injectors are a direct plug and play, and your ECU will be able to handle the tiny change. The 99-00 front bumper is also different from the 96-98, with the former having one smaller opening in the middle and two mock openings on the sides under the headlights. The 99-00 headlights are also different and cannot be used with the 96-98 model.
The 99-00 IM has an air injection feature that causes vacuum problems when used with a 96-98 head unless the holes are plugged. The opposite combination, a 96-98 IM with a 99-00 head, is less problematic and can be resolved by using a gasket from each model. The cylinder head is the same for both the 96-98 and 99-00, but the intake manifold and gasket are different.
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The 99-00 has a bigger mating surface
The 99-00 fuel injectors have a bigger mating surface than the 96-98 model. The 99-00 model has an air injection feature that causes vacuum leaks when used with a 96-98 head, unless the holes are plugged. The 99-00 model has a bigger nipple at the top of the mounting surface, and the mating surface is more square. The 96-98 model has a smaller mating surface and does not have a nipple by the top of the mating surface.
The 99-00 model has a different front bumper and headlights from the 96-98 model. The 99-00 bumper has one smaller opening in the middle and two mock openings on the sides under the headlights, while the 96-98 model has one big opening in the bumper cover. The 99-00 model also has a different shape for the headlights, hood, fenders, bumper, and grill.
The 99-00 injectors are 240cc/min, while the 01+ are 255cc/min. The difference in injector size is minimal, and your ECU will be able to handle the tiny change. However, if you install larger injectors, your ECU may cut back on fuel delivery as the primary O2 sensor will start saying you're running rich.
Overall, the main difference between the 99-00 and 96-98 fuel injectors is the bigger mating surface on the 99-00 model, which includes an air injection feature that requires some modifications when used with the 96-98 head.
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The 96-98 has a smaller, less square mating surface
The 96-98 fuel injectors have a smaller mating surface compared to the 99-00 version, which is less square-shaped. The 99-00 model has a larger mating surface area, and this is something to be aware of when considering a swap. The 99-00 model also has air injection holes, which can cause vacuum leaks when used with a 96-98 head, unless the holes are plugged. This is a common issue and a gasket from each model can be sandwiched together to solve the problem.
The 99-00 model has a different design with a nipple at the top of the mounting surface, and the air injection holes are located by the fuel injection at the end of the runners by the injectors. The 96-98 model lacks this nipple feature. The 99-00 model has a more distinct, squarer shape, while the 96-98 model has a more rounded, less angular shape.
The 96-98 model requires some modification to the radiator support to make it work, whereas the 99-00 model bolts up more easily. The 99-00 model has a different front bumper and headlight design, which is more complex, with one smaller opening in the middle and two mock openings on the sides under the headlights. The 96-98 model has a simpler design, with one big opening in the bumper cover.
The 99-00 model has a more modern, angular aesthetic, while the 96-98 model has a more classic, rounded look. The 99-00 model's design changes are largely cosmetic, and the performance of both models is similar. However, the 99-00 model's design improvements may offer some advantages in terms of aerodynamics and cooling.
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Frequently asked questions
The main difference between 98 and 99 00 fuel injectors is the addition of air injection in the 99 00 model. This feature causes vacuum problems when used with a 98 model unless you plug the holes.
The 99 00 fuel injectors are said to have a more powerful vacuum setup and are more efficient.
Yes, you can use 99 00 fuel injectors with a 98 model, but you will need to plug the air injection holes to prevent vacuum leaks.
