The 1979 Dodge Charger and its place in emissions history

The 1979 Dodge Charger sits at a turning point in American car design. This was the first year Chrysler's new, smaller Charger hit the road—a major shift from the muscle car era of the 1960s and early 1970s. The 1979 model came out just as the U.S. was tightening emissions rules and fuel economy standards, which shaped what engines Dodge could put in it and how those engines ran.

If you own or are considering a 1979 Charger, understanding what that year means for emissions and fuel use helps you know what to expect from the car and what repairs or modifications might be needed to keep it street-legal in your state.

Key Takeaways

  • The 1979 Charger was the first year of a completely redesigned, smaller model that reflected 1970s emissions and fuel economy rules.
  • Engine options ranged from a 2.2-liter four-cylinder to a 5.9-liter V8, with the smaller engines producing significantly better fuel economy.
  • All 1979 Chargers came with catalytic converters and emissions control systems required by federal law, though these systems sometimes fail or are removed on older cars.
  • Fuel economy for a 1979 Charger typically ranged from the mid-teens to low 20s miles per gallon, depending on engine size and driving conditions.
  • Emissions testing rules vary by state, and a 1979 Charger may face different inspection requirements depending on where you live and when the car was last registered.

Engine options and what they mean for emissions

Dodge offered several engine choices in the 1979 Charger. The base engine was a 2.2-liter four-cylinder that produced around 85 horsepower. Moving up, buyers could choose a 3.7-liter six-cylinder or a 5.2-liter V8. The largest option was a 5.9-liter V8 that produced roughly 195 horsepower. Each of these engines came from the factory with a catalytic converter and emissions control equipment.

The smaller engines—the four-cylinder and six-cylinder—were designed to meet fuel economy standards while staying within emissions limits. The V8 options gave more power but at the cost of higher fuel consumption and, in some cases, higher emissions output. If you are looking at a 1979 Charger, the engine size tells you a lot about what the car will cost to run and whether it will pass emissions testing in your state.

Catalytic converters and emissions control systems

Every 1979 Charger left the factory with a catalytic converter. This device sits in the exhaust system and converts harmful gases—carbon monoxide, nitrogen oxides, and unburned hydrocarbons—into less harmful substances. The catalytic converter is a legal requirement, and removing it or disabling it is illegal in all 50 states, even on older cars.

The 1979 Charger also came with other emissions control equipment: an air injection system that pumped fresh air into the exhaust, an exhaust gas recirculation (EGR) valve that routed some exhaust back into the engine, and a charcoal canister that captured fuel vapors from the tank. These systems work together to reduce what comes out of the tailpipe. On a car this old, these components may no longer work as designed, which can cause the car to fail emissions testing or run poorly.

Fuel economy for a 1979 Charger

The 1979 Charger was more fuel-efficient than the muscle cars of the previous decade, but by modern standards it still used a lot of gas. A four-cylinder 1979 Charger could achieve somewhere in the range of 20 to 24 miles per gallon on the highway, with city driving lower. A six-cylinder model typically saw 16 to 20 miles per gallon. The V8 models dropped to 14 to 18 miles per gallon, depending on driving conditions and how well the engine was maintained.

These numbers assume the car is in good mechanical condition and the emissions systems are working. A car with a failing oxygen sensor, a clogged air filter, or a malfunctioning EGR valve will use more fuel and produce higher emissions. If you own a 1979 Charger, keeping up with basic maintenance—spark plugs, air filters, fuel filters—will help it run as efficiently as it can for that year.

Emissions testing and state regulations

Whether your 1979 Charger needs to pass an emissions test depends on your state and sometimes on the county you live in. Some states do not test vehicles older than a certain year—often 25 to 30 years old—which means a 1979 Charger might be exempt. Other states test all cars regardless of age. A few states have different rules for cars built before a certain year, allowing them to meet older emissions standards rather than current ones.

If your state does require testing, you will need to take the car to an official testing station. The test measures what comes out of the tailpipe: carbon monoxide, nitrogen oxides, and sometimes particulate matter. A car with a working catalytic converter and functioning emissions systems usually passes. If the car fails, the testing station will tell you what pollutant is too high, which helps you know what to repair.

Common issues with 1979 Chargers and emissions

The most common problem with a 1979 Charger's emissions system is a failed or clogged catalytic converter. After 40+ years, the converter may have broken down internally or become blocked with carbon buildup. A failing converter will cause the car to run poorly, smell like rotten eggs, and fail emissions testing. Replacing a catalytic converter is expensive but necessary for legal operation.

The second common issue is a non-functional oxygen sensor. The oxygen sensor tells the engine computer (or carburetor on some 1979 models) how much fuel to burn. A bad sensor causes the engine to run too rich or too lean, which increases emissions and lowers fuel economy. The EGR valve also fails frequently on cars this age; a stuck or leaking EGR valve can cause rough idling and higher nitrogen oxide emissions.

Some owners remove or disable these emissions systems to improve performance or fuel economy. This is illegal and will cause the car to fail any emissions test. If you are buying a used 1979 Charger, ask the seller whether the emissions equipment is intact and functional.

Maintenance to keep emissions in check

To keep a 1979 Charger running as cleanly as possible, follow a regular maintenance schedule. Change the oil and oil filter every 3,000 to 5,000 miles. Replace the air filter annually or when it looks dirty. Keep the fuel filter clean and replace it if the car is hard to start or runs rough. Check that the battery is in good condition, because a weak battery can cause the engine to run poorly and produce higher emissions.

Have the ignition timing checked by a mechanic familiar with older cars. Timing that is off by even a few degrees can increase emissions and reduce fuel economy. If the car fails an emissions test, a good mechanic can diagnose which system is at fault—the catalytic converter, oxygen sensor, EGR valve, or air injection system—and repair it. Trying to pass an emissions test without fixing the underlying problem usually does not work.

Frequently Asked Questions

Can I drive a 1979 Charger if it fails an emissions test?

That depends on your state. Some states will not issue a registration or inspection sticker to a car that fails emissions testing. Other states allow you to drive the car but require you to get it repaired within a certain time frame and retest it. A few states have a waiver program for older cars if repair costs exceed a certain amount. Check your state's Department of Motor Vehicles website for the specific rules in your area.

Is it legal to replace the catalytic converter on a 1979 Charger?

Yes, replacing a failed catalytic converter is legal and necessary. You must install a converter that meets federal emissions standards for that year and engine size. Aftermarket converters are available and are usually less expensive than original equipment. Never remove the converter or install a "test pipe" that bypasses it, as this is illegal and will cause the car to fail testing.

What is the difference between a 1979 Charger and earlier Chargers in terms of emissions?

The 1979 Charger was a completely new design and was smaller and lighter than the 1968–1978 Chargers. It came with more advanced emissions control systems because federal standards had become stricter by 1979. Earlier Chargers may have had fewer or less sophisticated emissions equipment, depending on the model year. If you are comparing a 1979 to an older Charger, the newer one will generally produce lower emissions.

How do I know if the emissions equipment on my 1979 Charger is original?

Look under the car and trace the exhaust system from the engine to the rear. The catalytic converter should be a metal canister in the exhaust line. Check the engine bay for the air injection pump (usually a belt-driven pump on the side of the engine) and the EGR valve (typically mounted on or near the intake manifold). If these parts are missing or disconnected, the emissions systems have been removed. A mechanic can inspect the car and tell you what is missing or not working.

Will a 1979 Charger ever be exempt from emissions testing?

In some states, yes. As the car gets older, more states move it into an exemption category. Some states exempt all vehicles over 25 or 30 years old. Others exempt only vehicles that were not originally equipped with emissions control systems, which does not explore to a 1979 Charger. Check your state's current rules, as they can change. Even if your car is exempt from testing, the catalytic converter and emissions systems must remain intact and functional to be street-legal.