How often should you change spark plugs in a Mustang?
Over time, spark plugs can become less effective, so it’s important to keep a close eye on them every 30k miles or so. Tires: The type of tire and driving style heavily impact how long a set of tires will last you, but a good set of tires could last you up to ~50k miles!
How do you set a spark plug gap?
If the spark plugs give any resistance, spray around the plug with WD-40 to loosen it up. Be careful not to turn too hard or you could crack the plug. Set the gap on each new spark plug using the plug gapper. You will find the exact gap size for the 1999 Ford Expedition in your owner’s manual.
Where are the spark plugs located on a Mustang?
These Mustangs have coil-on-plugs. Where older designs will have a coil pack with plug wires, most modern cars have a coil sitting directly on top of the plug to fire it. Each coil-on-plug must be removed to access the spark plug it covers. Fortunately, the fuel rail and injectors do not have to come out to do this.
How do you replace spark plugs on a 1999 Ford Expedition?
How to replace the spark plugs on your 1999 ford Expedition. Using the wrench, remove the spark plugs from the engine block. If the spark plugs give any resistance, spray around the plug with WD-40 to loosen it up. Be careful not to turn too hard or you could crack the plug. Set the gap on each new spark plug using the plug gapper.
How often should spark plugs be changed on a 1999 Mustang?
My 1999 Mustang GT was bought with 118,000 miles on it. Spark plugs should be changed every 60,000 miles, so it was just about time. Fords of this vintage get a bad rap as far as spark plugs go, because the 05+ Mustangs had a terrible two-piece plug design that could break apart, leaving chunks of the spark plug in the cylinder.
What should I use to gap my spark plugs?
Locate the correct sized spark plug socket & wrench combo and start removing your spark plugs. Grab your spark plug gapping tool and start gapping your spark plugs to the correct specs. Apply a small amount of anti-seize to the threads of the spark plugs.
These Mustangs have coil-on-plugs. Where older designs will have a coil pack with plug wires, most modern cars have a coil sitting directly on top of the plug to fire it. Each coil-on-plug must be removed to access the spark plug it covers. Fortunately, the fuel rail and injectors do not have to come out to do this.
What to do if your spark plugs are bad?
Apply a small amount of anti-seize to the threads of the spark plugs. Start threading the spark plugs in by hand and then torque to the correct torque specs. Reconnect your spark plug wires. Reconnect the negative battery cable & take it for a test drive to ensure there are no driveability issues and you are finished!