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Mustang Forums
2011-2014 Mustangs
Supercharged Roush Mustang stutters, stalls right after shifting gears and giving it gas
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<blockquote data-quote="nuacr0s" data-source="post: 15537608" data-attributes="member: 175931"><p>I have a problem with my 2012 Roush Mustang. I recently upgraded everything along the air flow path, injectors and new custom tune, and now it stalls when I shift gears at WOT and it dies or has erratic idle after I shift from gear to neutral while cruising</p><p></p><p>I’ve blown some smoke up the air intake tube, but could not find any vacuum leaks, maybe vacuum only leaks under engine load, while I am driving, because cat temps run really high when I give it gas, not sure</p><p></p><p>It was fine before the air flow and injectors upgrade. Here is a list of what I changed:</p><p></p><p>Throttle body: from stock ford 60mm twin to VMP 67mm twin</p><p></p><p>Supercharger elbow: from stock roush to VMP high flow elbow (ported)</p><p></p><p>Intake tube: from roush 90mm to JLT 95mm tube</p><p></p><p>Injectors: from ford racing 47lb to injector dynamics 1000’s 98lb injectors</p><p></p><p>Coil packs: from ford stock to granatelli extreme coil packs</p><p></p><p>Fuel type: from 93 to 98 octane</p><p></p><p>MAF sensor is clean</p><p></p><p>Installed 2 oil catch cans: one for the engine manifold and one for the air intake tube</p><p></p><p>Everything else is stock</p><p></p><p>New Tune: XP racing tune</p><p></p><p>Dyno results: 640 rwhp and 530lb/ft rwt</p><p></p><p>I’ve not seen any posts linking acceleration stuttering to any of the upgrades above. Does anybody have an idea or a lead I can follow to try and get to the root of this issue?</p></blockquote><p></p>
[QUOTE="nuacr0s, post: 15537608, member: 175931"] I have a problem with my 2012 Roush Mustang. I recently upgraded everything along the air flow path, injectors and new custom tune, and now it stalls when I shift gears at WOT and it dies or has erratic idle after I shift from gear to neutral while cruising I’ve blown some smoke up the air intake tube, but could not find any vacuum leaks, maybe vacuum only leaks under engine load, while I am driving, because cat temps run really high when I give it gas, not sure It was fine before the air flow and injectors upgrade. Here is a list of what I changed: Throttle body: from stock ford 60mm twin to VMP 67mm twin Supercharger elbow: from stock roush to VMP high flow elbow (ported) Intake tube: from roush 90mm to JLT 95mm tube Injectors: from ford racing 47lb to injector dynamics 1000’s 98lb injectors Coil packs: from ford stock to granatelli extreme coil packs Fuel type: from 93 to 98 octane MAF sensor is clean Installed 2 oil catch cans: one for the engine manifold and one for the air intake tube Everything else is stock New Tune: XP racing tune Dyno results: 640 rwhp and 530lb/ft rwt I’ve not seen any posts linking acceleration stuttering to any of the upgrades above. Does anybody have an idea or a lead I can follow to try and get to the root of this issue? [/QUOTE]
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2011-2014 Mustangs
Supercharged Roush Mustang stutters, stalls right after shifting gears and giving it gas
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