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How To Change Mustang Spark Plugs - LMR Basics
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Published on 2016-12-05
The spark plug is a seemingly simple device, although it plays a critical role in internal combustion engines. There are three key ingredients an internal combustion engine requires to operate; air, fuel, and spark.
This informative video covers the basic procedure needed to change spark clubs in your 1979-1995 pushrod equipped, 5.0L Mustang. Shop LMR.com for the BEST selection of ignition related components for your Mustang.
How’s it going everybody? Landan with Late Model Restoration. In this installment of LMR basics, I’ll be showing you the general procedure on changing your spark plugs and will be doing the work on this 1992 Fox coupe.
The spark plug is a seemingly simple device, although it plays a critical role in internal combustion engines. There are three key ingredients an internal combustion engine requires to operate; air, fuel, and spark. A spark plug is a vital engine component that provides the spark; that ignites the air-fuel mixture; that drives an engine.
In perfect circumstances, and in a 100% bone stock car, extended-life spark plugs are engineered to last a hundred thousand miles. Of course, that change interval will drastically change based off of tuning and modifications to your car. It’s in your best interest to check a few plugs every oil change or after serious modifications and/or tuning to make sure everything is running efficiently.
To change the spark plugs in your Mustang, you’re going to need a few tools. You will need a spark plug socket, a socket set, and a simple gap tool to properly gap the plugs for your application. In our case, factory gap for this car is fifty-four thousandths. That of course will differ based off of plug choice and modifications.
To get started, pop the hood and disconnect the negative battery cable.
Remove the factory air box if equipped.
Disconnect all of the plug wires on both the driver and passenger side.
Take a 5/8” spark plug socket and socket wrench or in this case an open end wrench. Loosen and remove plugs one, two, three and four.
Take your new spark plugs and gap tool and gap the plugs to either factory specifications of fifty-four thousandths or the recommended gap for your application.
This is done by lightly prying up on the spark plug gap tool to widen the distance between the center and ground electrodes.
Do this for all four plugs. Once the plugs are gapped, apply a small amount of anti-seize to the threads.
Thread the plugs in by hand and then torque to five to fifteen pound feet depending on your application. On the driver side, it may help if you loosen and position the dipstick out of your way.
Repeat the previous steps for cylinders five, six, seven and eight. Reposition the dipstick if you moved it.
Now you can reconnect your plug wires or take the time to update those along with some plug wire dividers as well. Be sure and checkout are detailed plug wire install as well.
While you’re at it, a new distributor and coil cover wouldn’t hurt the under hood appearance as well.
Once complete, reconnect the negative battery cable and start the car.
Take it for test drive and make sure none of the plug wires are touching the header primaries.
That completes a successful spark plug change.
Installation time will obviously vary depending on the individual and the setup you have. However, this one should take no more than an hour of your time from start to finish and is a perfect weekend job.
Until next time guys, go ahead and subscribe to our YouTube channel if you haven’t already done so. Be sure and pick up a new set of spark plugs, plug wires and the related components from the real Mustang enthusiasts, LMR.com!