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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Replacing Spark Plugs on Roush 2013
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<blockquote data-quote="BalanBro" data-source="post: 1953760" data-attributes="member: 62816"><p>Possibly. Mine felt like it had an occasional miss at idle, but seemed fine otherwise. This was when I bought it last year with 68k.</p><p>Recently at 80k, I noticed a ticking sound coming from the driver side, so I decided to investigate. Came to find at least one of my coils occasionally arcing on the fuel rail and cylinder head. A bit more research and I come to find this is a very common issue on the 6.2 used on raptors and F250s. So I decided to replace all my plugs and coils with new Motorcrafts.</p><p></p><p>I just completed the job, removing each plug from a warm (not hot) engine. Getting to some of the lower plugs was a pain. The two most difficult were the passenger side by the shock tower, and the rear most driver side, up against the firewall. So here are my observations and assumptions:</p><p>All the plugs looked okay given the mileage. Actually, someone changed the top 8 plugs before, as they were a cheaper set with a platinum electrode. The bottom 8 were definitely the original, but didn't look bad at all. Could have easily been regapped and run for more miles, but for the cost, who cares?</p><p></p><p>I think the real issue is the coils. There is an internal resistor "pill" in the upper coil unit. All of them were corroded. What I believe happens, is the corrosion causes a poor connection between the coilpack and the plug, so the electricity goes though the path of least resistance, which happens to be through the vent holes in the coilpacks and to the nearest grounded metal object. When this happens, I believe the upper spark plug will not fire. However, since the 6.2 has a wasted spark system with two plugs, the lower one continues to fire so you don't get a complete misfire that would trigger a check engine light. After putting in new coils, the ticking noise is completely gone, idle is very smooth, and throttle response off idle and at low rpm is MUCH improved.</p><p></p><p>I heard there are boot kits to rebuild the coil packs with a new resistor, but I can't for the life of me get the old resistor pill out since it's corroded way up in there.</p><p></p><p></p><p>TL;DR</p><p>Your plugs may be fine, but the coils are suspect.</p></blockquote><p></p>
[QUOTE="BalanBro, post: 1953760, member: 62816"] Possibly. Mine felt like it had an occasional miss at idle, but seemed fine otherwise. This was when I bought it last year with 68k. Recently at 80k, I noticed a ticking sound coming from the driver side, so I decided to investigate. Came to find at least one of my coils occasionally arcing on the fuel rail and cylinder head. A bit more research and I come to find this is a very common issue on the 6.2 used on raptors and F250s. So I decided to replace all my plugs and coils with new Motorcrafts. I just completed the job, removing each plug from a warm (not hot) engine. Getting to some of the lower plugs was a pain. The two most difficult were the passenger side by the shock tower, and the rear most driver side, up against the firewall. So here are my observations and assumptions: All the plugs looked okay given the mileage. Actually, someone changed the top 8 plugs before, as they were a cheaper set with a platinum electrode. The bottom 8 were definitely the original, but didn't look bad at all. Could have easily been regapped and run for more miles, but for the cost, who cares? I think the real issue is the coils. There is an internal resistor "pill" in the upper coil unit. All of them were corroded. What I believe happens, is the corrosion causes a poor connection between the coilpack and the plug, so the electricity goes though the path of least resistance, which happens to be through the vent holes in the coilpacks and to the nearest grounded metal object. When this happens, I believe the upper spark plug will not fire. However, since the 6.2 has a wasted spark system with two plugs, the lower one continues to fire so you don't get a complete misfire that would trigger a check engine light. After putting in new coils, the ticking noise is completely gone, idle is very smooth, and throttle response off idle and at low rpm is MUCH improved. I heard there are boot kits to rebuild the coil packs with a new resistor, but I can't for the life of me get the old resistor pill out since it's corroded way up in there. TL;DR Your plugs may be fine, but the coils are suspect. [/QUOTE]
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