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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
P0300 code only at high rpm's under load
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<blockquote data-quote="TheGreatWhite5.0" data-source="post: 15700020" data-attributes="member: 187064"><p>So when I'm driving my car, when I go WOT and over 6500 rpm's my car starts to flash the check engine light and its a p0300 code. I check my misfire data through a handheld I have and I have misfires on every cylinder as follows (cylinder and number of misfires): cyl1-8 cyl2-2 cyl3-18 cyl4-1 cyl5-4 cyl6-7 cyl7-7cyl8-1. This problem started occuring randomly so I'm not sure what caused it. </p><p>My car is 2014 Mustang GT block</p><p>10.45:1 compression ratio</p><p>Fully built (manley rods/pistons/arp-bolts/billet oil-pump-gears)</p><p>Automatic</p><p>Roush 2.3 blower, 79mm pulley, jlt 123mm maf intake, ported elbow, stock kit gt500 tb, Deatchworks 95ib injectors, and I have a Boost-a-pump.</p><p>I run cali 91 octane and sometimes use VP octanium booster, not sure if that would have anything to do with it</p><p>car is Lund tuned and I've asked Jon jr. to look through it and he says its a 'lean misfire' and leaning out at the top. He thinks its the injectors but what are the odds 8 injectors are failing? I've changed the spark plugs, done a crank relearn, kam reset, and swapped coils around and it still is happening.</p></blockquote><p></p>
[QUOTE="TheGreatWhite5.0, post: 15700020, member: 187064"] So when I'm driving my car, when I go WOT and over 6500 rpm's my car starts to flash the check engine light and its a p0300 code. I check my misfire data through a handheld I have and I have misfires on every cylinder as follows (cylinder and number of misfires): cyl1-8 cyl2-2 cyl3-18 cyl4-1 cyl5-4 cyl6-7 cyl7-7cyl8-1. This problem started occuring randomly so I'm not sure what caused it. My car is 2014 Mustang GT block 10.45:1 compression ratio Fully built (manley rods/pistons/arp-bolts/billet oil-pump-gears) Automatic Roush 2.3 blower, 79mm pulley, jlt 123mm maf intake, ported elbow, stock kit gt500 tb, Deatchworks 95ib injectors, and I have a Boost-a-pump. I run cali 91 octane and sometimes use VP octanium booster, not sure if that would have anything to do with it car is Lund tuned and I've asked Jon jr. to look through it and he says its a 'lean misfire' and leaning out at the top. He thinks its the injectors but what are the odds 8 injectors are failing? I've changed the spark plugs, done a crank relearn, kam reset, and swapped coils around and it still is happening. [/QUOTE]
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2011-2014 Mustangs
Engine/Tuning
P0300 code only at high rpm's under load
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