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1994-2004 Mustang Spark Plug Gap Specs

Created by Andrew Perry / 2 min read
Date Created: 6/18/2025
Last Updated: 6/18/2025

Here at LMR we've put together a quick and easy guide to help you gap your spark plugs correctly for your 1994–2004 Ford Mustang!

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When tuning up your 1994-2004 Ford Mustang, one of the most common maintenance tasks is replacing the spark plugs. Properly gapped spark plugs are crucial for optimal engine performance, as incorrect gaps can lead to misfires, rough idling, or even no-start issues. The spark plug gap refers to the distance between the center and ground electrode of the spark plug. This gap needs to match your Mustang’s engine specifications to ensure efficient combustion. You can adjust the gap using a simple spark plug gap tool, available at most auto parts stores. Below, we've put together a quick guide to help you identify the correct spark plug gap for your SN95 or New Edge Mustang, depending on the engine type. Be sure to check out our complete offering of 94-04 Mustang spark plugs!

1994-2004 Ford Mustang Spark Plug Gap Chart

YearV6-3.8/3.9LV8-302 5.0L/4.6L
1994.052-.056in.052-.056in
1995.052-.056in.052-.056in
1996.052-.056in.052-.056in
1997.052-.056in.052-.056in
1998.052-.056in.052-.056in
1999.052-.056in.052-.056in
2000.052-.056in.052-.056in
2001.052-.056in.052-.056in
2002.052-.056in.052-.056in
2003.052-.056in.052-.056in / Cobra .035-.038in
2004.052-.056in.052-.056in / Cobra .035-.038in
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About the Author

Andrew has been writing content for Late Model Restoration for over 2 years, producing over 50 articles. Over the years, Andrew has owned numerous Mustangs, including a 2007 V6, 2003 GT, 1967 GT, 1994 GT, 1995 GT, 2014 GT (2), 2000 V6 (V8 swapped), 2016 GT/PP, 1988 LX 5.0, and a 2009 GT/CS. Read more...