Let's dive deep into everything you need to know about the exhaust system of your 1990 Honda Civic Sedan. We're talking about upgrades, maintenance, common issues, and how to keep your ride sounding sweet and running smoothly. If you're a car enthusiast or just trying to keep your trusty Civic in top shape, this guide is for you!

Understanding Your 1990 Honda Civic Sedan Exhaust System

Alright, guys, let's break down the basics. Your exhaust system is more than just a way to get rid of fumes; it's a crucial part of your car's performance. In a 1990 Honda Civic Sedan, the exhaust system typically consists of several key components working together in harmony:

• Exhaust Manifold: This is where it all begins. The exhaust manifold is bolted directly to the engine's cylinder head and collects the hot exhaust gases as they exit the engine's combustion chambers. Think of it as the starting point of the exhaust's journey. Its design plays a vital role in initial exhaust flow and can influence engine performance.
• Catalytic Converter: Next up is the catalytic converter. This component is responsible for reducing harmful pollutants in the exhaust gases, such as hydrocarbons, carbon monoxide, and nitrogen oxides, converting them into less harmful substances like carbon dioxide, water, and nitrogen. It's an essential part of meeting emissions standards and keeping the air clean.
• Resonator (if equipped): Some 1990 Civic Sedans came with a resonator, which helps to reduce specific sound frequencies, minimizing drone and unwanted noise in the cabin. If your Civic has one, it's usually located in the mid-pipe section of the exhaust.
• Muffler: The muffler is the final major component. It's designed to dampen exhaust noise, making your car quieter and more comfortable to drive. The muffler uses a series of chambers and baffles to cancel out sound waves and reduce the overall volume of the exhaust.
• Piping: Connecting all these components are various pipes. These pipes carry the exhaust gases from the manifold, through the catalytic converter and resonator (if present), and finally to the muffler.

Understanding how each part works will help you diagnose problems and make informed decisions about repairs and upgrades. Remember, a well-functioning exhaust system not only reduces pollution but also optimizes your engine's performance and fuel efficiency. We need to consider things like backpressure and flow when modifying or repairing the system.

Common Exhaust Issues in the 1990 Honda Civic Sedan

Okay, so what are some of the typical problems you might run into with your 1990 Civic's exhaust? Let's run through the usual suspects. Knowing these can save you time and money when troubleshooting.

• Rust and Corrosion: This is a big one, especially if you live in an area with harsh winters or salty roads. Over time, the exhaust system can rust and corrode, leading to leaks and reduced performance. Check for rust spots, especially around joints, hangers, and the muffler.
• Exhaust Leaks: Leaks can occur anywhere in the system, from the manifold gasket to the muffler. They can cause a noticeable increase in exhaust noise, a decrease in fuel efficiency, and even trigger the check engine light. Common leak points include rusted sections, cracked welds, and damaged gaskets.
• Catalytic Converter Problems: The catalytic converter can become clogged or fail over time, reducing its efficiency and potentially causing the engine to run poorly. Symptoms include a decrease in power, poor fuel economy, and a sulfur-like smell from the exhaust. A failing catalytic converter can also cause the car to fail an emissions test.
• Muffler Damage: Mufflers can rust out, develop holes, or become damaged from impacts. A damaged muffler will usually result in a louder exhaust note and could affect the car's overall performance. It's important to inspect the muffler regularly for signs of damage.
• Hanger Issues: The exhaust system is supported by hangers, which can break or become loose over time. This can cause the exhaust system to sag, vibrate, or even drag on the ground. Inspect the hangers regularly and replace any that are damaged or missing. Ignoring hanger issues can lead to more significant exhaust system damage.

Addressing these common issues promptly can prevent further damage and keep your Civic running smoothly. Regular inspections and maintenance are key to extending the life of your exhaust system. Also, keep an ear out for any unusual noises, as they can often be an early warning sign of a problem. Don't ignore that rattling or hissing sound!

Exhaust Upgrades for Your 1990 Honda Civic Sedan

Ready to give your 1990 Civic a little extra oomph? Upgrading the exhaust can improve performance, sound, and even the overall look of your car. But what are your options, and what should you consider?

• Cat-Back Systems: A cat-back system replaces everything from the catalytic converter back to the tailpipe. These systems typically offer improved exhaust flow, resulting in a slight increase in horsepower and torque. They also often have a sportier sound. Look for systems made from high-quality materials like stainless steel for durability.
• Axle-Back Systems: An axle-back system replaces only the muffler and the section of pipe after the rear axle. This is a more budget-friendly option for improving the sound of your exhaust without significantly affecting performance. These systems are easy to install and can give your Civic a more aggressive tone.
• Headers: Upgrading the exhaust manifold (headers) can significantly improve exhaust flow, leading to noticeable gains in horsepower and torque. Aftermarket headers are designed to be less restrictive than the factory manifold, allowing exhaust gases to exit the engine more efficiently. This upgrade often requires professional installation and may affect emissions compliance.
• High-Flow Catalytic Converters: A high-flow catalytic converter can improve exhaust flow while still meeting emissions standards. These converters are designed to be less restrictive than the factory unit, allowing for better performance without sacrificing environmental responsibility. This is a good option for those looking to balance performance and emissions.
• Custom Exhaust Systems: For the ultimate in performance and customization, consider a custom exhaust system. This involves having a shop fabricate a system tailored to your specific needs and preferences. A custom system can be optimized for maximum flow and sound, but it's also the most expensive option.

Before making any upgrades, it's essential to consider factors like your budget, desired performance gains, and local emissions regulations. Do your research and choose components that are compatible with your 1990 Civic. Also, remember that some upgrades may require modifications to other parts of the car, such as the engine management system. Talk to a professional to get the best advice for your specific needs.

Maintenance Tips for Your 1990 Honda Civic Sedan Exhaust

Keeping your exhaust system in good condition is crucial for your Civic's performance and longevity. Here are some essential maintenance tips to follow:

• Regular Inspections: Inspect your exhaust system regularly for signs of rust, leaks, and damage. Pay close attention to the joints, hangers, and muffler. Early detection of problems can prevent them from escalating into more significant issues.
• Check for Leaks: Listen for unusual noises, such as hissing or rattling, which could indicate an exhaust leak. You can also visually inspect for leaks by looking for black soot around joints and connections. Addressing leaks promptly can prevent performance issues and potential damage to other components.
• Keep it Clean: Periodically clean your exhaust system to remove dirt, debris, and road salt. This can help prevent rust and corrosion, especially in areas with harsh weather conditions. Use a mild soap and water solution and rinse thoroughly.
• Replace Worn Parts: Replace any worn or damaged parts promptly, such as gaskets, hangers, and clamps. Using high-quality replacement parts will ensure a proper fit and long-lasting performance. Don't skimp on quality when it comes to exhaust components.
• Professional Check-ups: Have your exhaust system inspected by a professional mechanic during routine maintenance. They can identify potential problems that you might miss and provide expert advice on repairs and upgrades. A professional inspection can also ensure that your exhaust system meets emissions standards.

By following these maintenance tips, you can extend the life of your 1990 Honda Civic's exhaust system and keep it running efficiently. Remember, a well-maintained exhaust system not only improves performance but also helps to reduce pollution and keep your Civic running smoothly for years to come. Regular maintenance is an investment in the long-term health of your vehicle.

Step-by-Step: Replacing Your 1990 Honda Civic Sedan Exhaust

Alright, feeling brave enough to tackle an exhaust replacement yourself? Here’s a general guide. Remember, safety first, and if you're not comfortable, get a pro to handle it. But for the DIYers, here’s a breakdown:

1. Gather Your Tools and Parts: Before you start, make sure you have all the necessary tools, including wrenches, sockets, penetrating oil, a jack, jack stands, and safety glasses. Also, have your new exhaust components ready to go.
2. Safety First: Jack up your 1990 Civic and secure it with jack stands. Never work under a car supported only by a jack. Wear safety glasses to protect your eyes from debris. Let the exhaust cool down completely before starting to avoid burns.
3. Loosen Connections: Spray penetrating oil on all the bolts and connections you'll be removing. This will make it easier to loosen them and prevent them from breaking. Let the oil soak in for at least 15-20 minutes.
4. Remove the Old Exhaust: Start by removing the bolts holding the exhaust system together, working from the back to the front. Be careful not to damage any of the surrounding components. You may need to use a rubber mallet to gently tap the exhaust system loose.
5. Install the New Exhaust: Install the new exhaust components in the reverse order of removal. Make sure all the connections are tight and properly aligned. Use new gaskets and hardware to ensure a proper seal.
6. Check for Leaks: Once the new exhaust is installed, start the car and check for any leaks. Listen for unusual noises and visually inspect the connections for any signs of exhaust escaping. Tighten any loose connections as needed.
7. Final Check: After a test drive, re-check all the connections to ensure they are still tight. Monitor the exhaust system for any issues and address them promptly.

Replacing your exhaust system can be a rewarding DIY project, but it's essential to take your time and follow the steps carefully. If you encounter any difficulties or are unsure about any part of the process, don't hesitate to seek professional assistance. A properly installed exhaust system will improve your Civic's performance and sound, making it a worthwhile upgrade.

Maximizing Performance and Sound

Now, let's talk about getting the most out of your exhaust system. Whether you're looking for better performance, a more aggressive sound, or both, here are some tips to help you achieve your goals:

• Optimize Exhaust Flow: Improving exhaust flow is key to maximizing performance. This can be achieved by upgrading to a less restrictive exhaust system, such as a cat-back or header system. A free-flowing exhaust allows the engine to breathe more efficiently, resulting in increased horsepower and torque.
• Choose the Right Muffler: The muffler plays a significant role in determining the sound of your exhaust. Experiment with different types of mufflers to find the sound that you like best. Chambered mufflers tend to produce a deep, throaty sound, while straight-through mufflers offer a louder, more aggressive tone.
• Consider an Electronic Exhaust Cutout: An electronic exhaust cutout allows you to bypass the muffler, unleashing the full sound of your engine. This can be a fun option for occasional use, such as at the track or during car shows. However, be aware that it may not be legal for street use in all areas.
• Tune Your Engine: After making significant exhaust upgrades, consider tuning your engine to optimize performance. A professional tune can adjust the engine's fuel and ignition settings to take full advantage of the improved exhaust flow. This can result in even greater gains in horsepower and torque.
• Balance Performance and Sound: Finding the right balance between performance and sound is essential. A too-loud exhaust can be annoying for daily driving, while an overly restrictive system can limit performance. Consider your driving habits and preferences when choosing exhaust components.

By optimizing your exhaust system for both performance and sound, you can transform your 1990 Honda Civic into a true driving machine. Whether you're cruising down the street or hitting the track, a well-tuned exhaust system will enhance your driving experience and turn heads wherever you go.

So there you have it! Everything you need to know about your 1990 Honda Civic Sedan's exhaust system. Keep this guide handy, and you'll be well-equipped to keep your ride roaring for years to come!