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#1
09-08-2018, 02:08 PM
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2003 lb7 keeps giving maf code.
Recently blocked the egr and removed the vacuum pump and intake heater. Been getting maf code since. New sensor. Same deal. Only throws the code when I start it. Pulling 53-56 g/s flow at idle. This is driving me nuts having to reset the light every time I start my pickup.
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#2
09-08-2018, 02:48 PM
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Did you retune it after the new mods?? That’s your maf issue.... you prob have some other associated codes.
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 1970 Chevelle Duramax Hot Rod, '04 LB7/TH400-gear vendor, HTT 67.7 FMW, Wagler street intake, 65% S&S sticks, exergy 10 mil pump, SoCal AF3388, Valve springs, Push Rods, LBZ rods, cut LB7 slugs..... 10 sec cruzer :-) 2002 2500HD LLY 6 speed ally conversion
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#3
09-08-2018, 03:09 PM
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At start up the ecm goes through the egr checks. It is looking for a drop in air flow since some of it will be provided by the egr. If it is blocked then it won't see the drop and may trigger the code. Would likely get egr codes too
Need to have the tune adjusted for the changes
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2008 Chevrolet 3500HD DRW LTZ 285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L. 2006 BRM Jetta TDI. Injectors, turbo, Malone custom tuning on ecm and tcm
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#5
09-08-2018, 04:06 PM
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53-56 g/s does seem a little high. Shouldn't it be closer to 40ish.
Stock intake?
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2008 Chevrolet 3500HD DRW LTZ 285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L. 2006 BRM Jetta TDI. Injectors, turbo, Malone custom tuning on ecm and tcm
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#7
09-08-2018, 09:26 PM
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Well, there's your first mistake. K&N intakes are terrible for these trucks.
Have you put the stock intake back on to see if the code comes up again?
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Tom "BBT" -- 2003 GMC CC/SB 4x4 12.14@111.15 "The Cruzer" -- 2014 Chevy Cruze Diesel -- the fun little DD "Kleshay" -- 2000 C5 Corvette -- the toy "The Bigger Boat" -- 2011 Workhorse P700 - 6.0LS/Allison - what I drive at work Two wrongs dont make a right, but three rights do make a left. Reality is a matter of perspective. This forum isn't for the weak of heart.....or wallet. "Lets build a race car they said. Itll be fun they said. I don't know who "they" are.........but they need a good punch in the face!" -- mufflerguy (yb)
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#9
09-21-2018, 08:35 PM
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53-56 is way to high and will code. Should be down in the mid 30's to low 40's for an lb7. I would be looking for boost leaks myself.
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1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that, DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit. 
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