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Old 09-26-2009, 04:47 PM   #1 (permalink)
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stumbling under boost
hey guys,
i thought for sure it was a bad coil that was making my truck stumble under boost again. but i just installed a brand new set of coils, and its still stumbling under boost.
what else could it be?
i was just in canada, and the highest octane they had was 91. i alway put 93 in when im down here. i was up there for 2 weeks driving with that gas. would this be the problem?
Last edited by bskin38; 09-26-2009 at 04:57 PM.
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Old 09-26-2009, 05:16 PM   #2 (permalink)
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I would not go WOT with 91 even though it is close to 93 but the temps have been getting very cold at night. My truck used to stumble and I removed the EGR and it was good after that. I believe your EGR is removed already so it could be either fuel related or a vacuum leak.
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Old 09-26-2009, 05:58 PM   #3 (permalink)
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Originally Posted by PhLoBuS View Post
I would not go WOT with 91 even though it is close to 93 but the temps have been getting very cold at night. My truck used to stumble and I removed the EGR and it was good after that. I believe your EGR is removed already so it could be either fuel related or a vacuum leak.
i was actually gunna call you tomorrow and see if you had any ideas.
i think tomorrow ill pull a plug or 2 and see what they look like. but idk if the plugs would be the problem, because i just installed them not to long ago.
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Old 09-26-2009, 10:13 PM   #4 (permalink)
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maybe the plug gap is too open. only stumbles under boost? do you have a wideband?
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Old 09-27-2009, 08:33 AM   #5 (permalink)
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When are you experiencing the stumble???
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Performance: KB 2.3 (3.5" upper 6# lower), JLP Sheetmetal Plenum, Chickenears Stage 3 Cool-Aid, SCT BA2600, NKG TR6s (.034"), Accufab SBTB, C&L Elbow, MotoBlue Aux Idler Kit, MotoBlue 100mm Idler, L&S Separator, Afco Dual Pass w/ Fan Kit, JLP Intercooler Res, TA Girdle, Stant 170* T-stat, Bassani High Flow Mids and Catback, FTVB, 4x4 Pan & Filter, Hotchkis Springs, Belltech Shock Extenders, JLP Shackles, JLP Long Bars, CE Drive Shaft Loop, SCT SF3, WMS Tuned, Dual Aeroforce Interceptors, MMCustomworks Dual Instrument Cluster Pod, Autometer Phantom Boost and Fuel Pressure Gauges, AEM Wideband, EGR & Fuel EVAP Delete
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Old 09-27-2009, 07:27 PM   #6 (permalink)
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Quote:
Originally Posted by PhLoBuS View Post
I would not go WOT with 91 even though it is close to 93 but the temps have been getting very cold at night. My truck used to stumble and I removed the EGR and it was good after that. I believe your EGR is removed already so it could be either fuel related or a vacuum leak.



x2 my truck had a very small annoying stumble replaced all coil on plugs spark plugs checked all vacume lines ect fuel filter oil change everything i could think off ended up when i took my truck back to get a new tune from my tunner he drove it and asked if we had the egr turned off or on and i said it was left on and he said HMMM busted out a new tune with out the egr on and no more stumble ......
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Old 09-29-2009, 07:35 PM   #7 (permalink)
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this was my stumble stumble
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Old 09-29-2009, 10:38 PM   #8 (permalink)
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91 octane ftl
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