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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
5.4l Spark Plugs
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<blockquote data-quote="MarkT" data-source="post: 85935" data-attributes="member: 3007"><p>Everybody has probably heard one story or another about the Ford 5.4l spark plugs issues.</p><p></p><p>The early 5.4 engines had only about 4 threads holding the plugs in and sometimes the threads would strip and the plug would shoot out of the head. Ford added more threads on later models to solve the problem.</p><p></p><p>Then in 2004 came the 3V Triton engine with an unconventional spark plug design... plenty of threads but it had a long shielded center electrode below the threads. At high mileages, sometimes the shield would seize in the head. There was also a weak spot where the shield attached below the threads caused by the manufacturing technique ("two piece design"). The end result? The spark plug would unthread just fine but the electrode shield would snap off and stay in the head. Ouch! </p><p></p><p>There is a Ford TSB on spark plug removal and tools available to extract the broken shield if it snaps off. Champion also came out with a new manufacturing technique ("one piece design") which makes the shield attachment much stronger and breakage far less likely. </p><p></p><p>[ATTACH=full]178223[/ATTACH]</p><p></p><p>The good news is that in 2008 Ford redesigned the spark plugs yet again. The spark plugs in our Raptors are a more conventional design without the long shield and with plenty of threads to prevent thread stripping. Problem solved!</p></blockquote><p></p>
[QUOTE="MarkT, post: 85935, member: 3007"] Everybody has probably heard one story or another about the Ford 5.4l spark plugs issues. The early 5.4 engines had only about 4 threads holding the plugs in and sometimes the threads would strip and the plug would shoot out of the head. Ford added more threads on later models to solve the problem. Then in 2004 came the 3V Triton engine with an unconventional spark plug design... plenty of threads but it had a long shielded center electrode below the threads. At high mileages, sometimes the shield would seize in the head. There was also a weak spot where the shield attached below the threads caused by the manufacturing technique ("two piece design"). The end result? The spark plug would unthread just fine but the electrode shield would snap off and stay in the head. Ouch! There is a Ford TSB on spark plug removal and tools available to extract the broken shield if it snaps off. Champion also came out with a new manufacturing technique ("one piece design") which makes the shield attachment much stronger and breakage far less likely. [ATTACH=full]178223[/ATTACH] The good news is that in 2008 Ford redesigned the spark plugs yet again. The spark plugs in our Raptors are a more conventional design without the long shield and with plenty of threads to prevent thread stripping. Problem solved! [/QUOTE]
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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
5.4l Spark Plugs
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