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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
2018 with PRX93 tune engine stuttering at altitude
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<blockquote data-quote="eclou" data-source="post: 1865065" data-attributes="member: 27872"><p>I have a 2018 with PRX93 tune, 80k miles, had cam phasers done x2. Just replaced the vacuum hoses and check valve for the front hub engagement. Newer motorsports plugs in the last 5k miles.</p><p></p><p>Driving up to Colorado from Houston started getting some stuttering from the engine on medium throttle at highway speeds. Thought it might be related to octane as only 91 was available in West Texas, NM, Colorado. I have been adding octane boost and fuel system cleaner. No codes thrown on the NPT gauge but at one point trying to pass on the freeway it stuttered badly enough to throw a CE service light and said "cylinder 1 misfire". I cleared it and engine ran ok again but still stutters under higher throttle load.</p><p></p><p>Now if I manually downshift to 7th gear and ease into the acceleration it doesn't happen as much </p><p></p><p>Anyone got any ideas of what's up?</p></blockquote><p></p>
[QUOTE="eclou, post: 1865065, member: 27872"] I have a 2018 with PRX93 tune, 80k miles, had cam phasers done x2. Just replaced the vacuum hoses and check valve for the front hub engagement. Newer motorsports plugs in the last 5k miles. Driving up to Colorado from Houston started getting some stuttering from the engine on medium throttle at highway speeds. Thought it might be related to octane as only 91 was available in West Texas, NM, Colorado. I have been adding octane boost and fuel system cleaner. No codes thrown on the NPT gauge but at one point trying to pass on the freeway it stuttered badly enough to throw a CE service light and said "cylinder 1 misfire". I cleared it and engine ran ok again but still stutters under higher throttle load. Now if I manually downshift to 7th gear and ease into the acceleration it doesn't happen as much Anyone got any ideas of what's up? [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
2018 with PRX93 tune engine stuttering at altitude
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