CODE P0171

2007 Hummer H3



October, 6, 2012 AT 11:29 PM

HI thanks for reading I recently got the code
freeze frame info
DTC P0171

Fuel SYS1 cl

Fuel SYS2 N.A

Load PCT calculated load value 18, 0%

ETC engine coolant temp 86 C or 187 F

Short term fuel 1, 6%

Long term fuel 24, 2 %

Map 29 KPA


VSS Vehicle speed 0

spark advance ignition timing advance 10

IAT intake air temp 57 C

MAF 3.00 g/s

TP 12.2 %

Air Stat off

P0171 engine runs too lean B1 S1
any way no vaciom leaks found after I changed the intake manifold still the same problem
today I changed the exhaust manifold due to crack with new OEM new one I have reset the code p0171 now the trem fuel level is like

Short fuel trem is 7%
long fuel trem is still 24% just like old times
HO2S sensoer changed by new one code is still there

i am going crazy I already through 740$ for exhaust manifold 250$ for intake manifold 65$ for HO2S 95$ for MAF its driving me crazy please help

hummer h3 89000M 2007 LLR 3.7l I-5

no miss fire records on cylinders

Correct me if I am wrong


1 Answer



October, 7, 2012 AT 12:07 AM

If the air filter was recently removed, check if it is securely attached to intake tube inside air cleaner assy. A lean condition can be due to air bypassing the filter.

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