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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
New Raptor - misfire detected - p0305, p0316
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<blockquote data-quote="FordTechOne" data-source="post: 1551992" data-attributes="member: 35543"><p>DTC P0305 is cylinder #5 misfire; P0316 is misfire detected within the first 1000 engine rotations following the engine being started.</p><p></p><p>Diagnostics should be focused on DTC P0305, since it indicates the specific cylinder that has been attributed to the misfire.</p><p></p><p>Misfires can be caused by 3 possible systems; base engine (valves sticking, low compression etc) which are typically consistent, or at least consistent with certain conditions present (temperature, load, engine RPM, etc). Fuel/spark misfires are the most common, and are typically caused by a faulty coil, injector, or poor electrical connection. Engine management related misfires are rare, but can be caused by everything from a damaged crankshaft position (CKP) tone ring or sensor to a faulty PCM.</p><p></p><p>With the symptom being both intermittent with DTCs and a loss of power/rough running, I would suspect it’s fuel/ignition related. As some others have mentioned, poor quality fuel can also cause these symptoms. It sounds like it occurs when the engine is fully warmed up after an extended drive; be sure to give the dealer as many details as possible regarding the conditions under which it occurs. If they just take it around the block, they’re not going to be able to duplicate it. Once they duplicate it and determine root cause through diagnosis, there is no need to worry about it being a long-term issue.</p></blockquote><p></p>
[QUOTE="FordTechOne, post: 1551992, member: 35543"] DTC P0305 is cylinder #5 misfire; P0316 is misfire detected within the first 1000 engine rotations following the engine being started. Diagnostics should be focused on DTC P0305, since it indicates the specific cylinder that has been attributed to the misfire. Misfires can be caused by 3 possible systems; base engine (valves sticking, low compression etc) which are typically consistent, or at least consistent with certain conditions present (temperature, load, engine RPM, etc). Fuel/spark misfires are the most common, and are typically caused by a faulty coil, injector, or poor electrical connection. Engine management related misfires are rare, but can be caused by everything from a damaged crankshaft position (CKP) tone ring or sensor to a faulty PCM. With the symptom being both intermittent with DTCs and a loss of power/rough running, I would suspect it’s fuel/ignition related. As some others have mentioned, poor quality fuel can also cause these symptoms. It sounds like it occurs when the engine is fully warmed up after an extended drive; be sure to give the dealer as many details as possible regarding the conditions under which it occurs. If they just take it around the block, they’re not going to be able to duplicate it. Once they duplicate it and determine root cause through diagnosis, there is no need to worry about it being a long-term issue. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
New Raptor - misfire detected - p0305, p0316
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