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10-11-2023, 02:54 PM
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,238
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system lean codes
ive been battling p0171, p0174 syatem lean bank1 and bank 2 i've already replaced the intake gaskets, i do not have a brake booster but i have the van plug in the back of the intake not leaking, ive cleaned the mass flow air sensor, no change will set lean codes after about 30 mins of driving, fuel pressure is 60psi, so im left with either a bad mass flow or 2 bad oxygen sesnors whats the best way to tell which i need without throwing parts at it? motor is a 2004 silverado 4.8 4l60e running an corvette filter and ac delco ep381 fuel pump.
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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