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How To Tune-up Your Ford Mustang

Written By: Josh Honeycutt

If you're looking to for a little more pep out of your mustang, a simple tune up can restore lost power. Keeping up on general maintenance will extend the life of your Mustang, so you continue wowing at shows and on the streets.

American Muscle

Tire Pressure

For daily driven applications, most Mustang owners run their tire pressures between 30-35psi. Incorrect tire pressure can cause uneven tire wear, and can also affect gas mileage. You can find the optimum pressure by inspecting the tread wear periodically. Even wear is the main goal. If the center of the tread is wearing faster than the rest of the tread, reduce pressure by 4-5 psi. If the outer edges are wearing more, increase pressure by 4-5 psi.

50 Years of Mustangs Tire Pressure Gauge

Wheel Balancers

There are other important aspects to inspect on your Mustang wheels as well. Located on the outer or inner lip of the rim are your wheel balancers. These are located at precise points on the rim to ensure proper rotational balance. If they are missing, the tire can produce a rumbling or roaring noise, and sometimes a slight shake in the steering wheel. Make sure these are intact, and occasionally have them rebalanced by a qualified tire shop.

Checking the Tires on a Foxbody Mustang

Tire Inspection

When inspecting your tires, make sure to check for any nails or other sharp object that may be lodged in the tire. Confirm the valve stems (the rubber nipple you use to inflate or deflate your tires with) are leak proof. Move them back and forth gently with your finger and listen for air leaks. If you suspect there maybe a slow leak in your tire, spray the area suspected with a soapy water mixture. If there is a leak you will see large bubbles forming where the air is escaping.

Hankook Ventus V12 Tires for Mustangs

Change Your Mustang’s Spark Plugs, Coils, & Wires

With modern day emissions compliant and fuel injected Mustangs, spark plugs last much longer than in the past. However, if your high mileage Mustang is still sporting the factory plugs, you may be wasting fuel, and putting a strain on the entire ignition system. It is important to periodically inspect the spark plugs for wear. On high mileage Mustangs with older spark plugs, the electrode of the plug erodes, increasing the plug gap. The condition of the plugs can provide information on how the engine is performing. For those with modded Mustangs, getting an aftermarket plug built to handle the added power is essential.

Coil packs don’t necessarily have to be replaced on a regular basis, but performe a simple inspection to ensure they are free of contaminants and the connections are firm. Plug wires don’t have to be replaced for long periods of time, however, inspections need to be completed. Specifically, make sure the jackets, insulation, and ends are not wearing and in proper condition. Additionally, making sure the wires have proper terminations and solid wire connections.

Autolite Mustang Spark Plug

Mustang Spark Plug Replacement Options

Spark plugs are relatively inexpensive. NGK, Ford Motorcraft and E3 all make quality spark plugs. Be sure they are gapped correctly for the application. In forced induction cars, the spark plugs must be checked more frequently. The combustion chamber conditions are a harsh environment for boosted or NOS cars. Therefore the spark plugs must be gapped smaller and inspected quite frequently, this is critical.

NGK Mustang Spark Plug Set

Checking Your Battery's Voltage & Condition

Tools needed: Voltmeter capable of reading 20 volts DC and less.

1. Select the voltmeter to read DC with a max value of 20 V or less.

2. With the car off, place the positive lead of a voltmeter on the positive post of the battery (red lead to red cable) and the black lead of the voltmeter to the negative post on the battery.

3. A fully charged battery should read 12-13 volts. Lower than 12 would indicate a weak battery, whereas under 11 volts indicates a failing (or failed) battery.

4. With the car running, the voltmeter should read 13.5-14.7 volts, indicating the charging system is working correctly. Any value higher than this would indicate an overcharge situation, and any value lower than 13.5 would indicate a discharge situation meaning the electrical system is unable to keep up.

Mustang Replacement & Aftermarket Air Filters

The air filter is the starting point for all air entering the engine. Therefore, it’s exposed to all the elements. Humidity, dirt, grime, sand, etc. all bombard the air filter. If you’re sticking with the stock paper filter, it’s a good idea to replace it with every oil change as this can affect the life of the engine and gas mileage. Many aftermarket companies such as K&N, JLT and MAC produce reusable air filters for the Mustang. These usually can net a little extra horsepower and better fuel economy. These only require the periodic wash (with a hose) and oiling. Make sure to use the manufactures provided oiling kit, as it is application specific. Also, follow the directions they provide.

Edelbrock Mustang Air Filter

How Do I Maintain My Mustang's PCV Valve?

A big key way of maintaining the PCV valve on a Mustang is to keep up with oil changes. PCV is directly correlated with oil pressure. The older the oil is, the thicker it will become. This in turn makes it more difficult to pass through the PCV system and can potentially create blockages.

Flush Your Mustang’s Radiator & Testing Your Thermostat

The more miles you put on your cooling system, the more corrosion it is exposed to. Extreme temperature changes and the exposure to ferrous metals can cause your coolant to pick up contaminants. This is especially true to Mustangs with cast-iron heads. Even with anti-freeze some oxidation occurs. You don’t want rust and iron particles building up in your radiator. This can lead to clogged coolant passages and overheating. Make sure the radiator cap is in good operating condition, if not just replace it as its pretty inexpensive. A proper radiator flush can be performed by a local shop and should be done annually.

A thermostat allows your Mustang's coolant to flow by opening or closing when the engine reaches a certain temperature. A fantastic way to maintain the thermostat is to keep an eye on the condition of the coolant itself. Coolant passes through the thermostat and having dirty coolant can clog the thermostat and prevent it from opening or closing. You can test the thermostat from time to time by putting it in water and then heating the water to the temperature where the thermostat would open. If the thermostat opens, then it is functioning as it should.

Mustang Mishimoto Radiator

Your Fuel Filter & Cold Weather Storage

Fuel filters can benefit from change by removing the dirt and debris that can find their way into the fuel tank. Changing this can remove potential clogs, keep filters clean, and give an owner a solid peace of mind. Keeping your fuel clean and staiblized during the cold season can go a long way in making sure your pony doesn't turn up lame come spring time.

For the Mustang owner exposed to the extremely frigid temperatures of winter, it’s extremely important to be sure your Mustang is winterized. If your mustang is going to be sitting in cold temperatures for an extended amount of time, use a fuel additive to your fuel tank. This will help to maintain octane and remove moisture from the fuel. If your Mustang will be exposed to sub-freezing temperatures, be sure you have fresh anti-freeze in the engine. The last thing you want to find is you freeze plugs lying on the ground beneath your stang.

2005-2009 Mustang in the Winter Months

Oil Changes and Oil Filters

Whether it be some small metal flakes from a brand new engine or catching outside contaminants, keeping the oil filter clean can keep the engine alive and healthy. Make sure to replace your oil filter during every oil change if you're doing them yourself. If you need more details on how to change your Mustang's oil, check out this guide.

Preventive Maintenance Is Cheaper Than Repair

Staying on top of your Mustang’s maintenance schedule will prevent major repairs in the future. These are all simple procedures to ensure your Mustang lives a long, healthy life. All it takes is a little neglect to send your precious stallion on a slow path to the bone yard. With a little maintenance and a careful eye, you can provide a long healthy life for your Mustang. Just keep the above tips in mind and you'll do fine:

  • Keep an eye on your tire pressure for maximum mpg and to preserve your tires
  • If you lose a wheel weight, replace it. Unnecessary vibrations only serve to cause headaches
  • Watch for dry rotting or slow leaks from your tires
  • Large spark plug gaps strain the ignition system. Replace them appropriately
  • An air filter is probably one of the easiest items to replace. Keep your Mustang breathing freely
  • Coolant should be replaced once a year to prevent it becoming too acidic and eating up your Mustang’s cooling system
  • If your Mustang hibernates for the winter, don’t forget fuel stabilizer and other winter prep items
Many Generations of Mustangs at the Track
Fitment includes: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, GT, V6, Cobra, ShelbyGT500, Bullitt, Mach1, Boss, LX, SVO, EcoBoost, ShelbyGT350