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.
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.
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, GT, V6, Cobra, ShelbyGT500, Bullitt, Mach1, Boss, LX, SVO, EcoBoost, ShelbyGT350