code P0171

2007 HUMMER H3

88,000 MILES

ALIJAMAL

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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

RPM 601 RPM

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

Oct 6, 2012 at 11:29 PM

SQM

CERTIFIED EXPERT
6,383 POSTS

Hello,

An engine can run lean due to a number of reasons.
It could be due to an intake leak, vacuum leak, exhaust leak, faulty mass air flow sensor, malfunctioning oxygen sensor, it can also run lean due to a leak in the air intake tubing.

The best course of action would be to take a look at the usual possibilities and take appropriate action.

Here is a helpful guide:

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Since you have already checked and replaced a few items it is a good idea to take a deeper dive of that code diagnostics.

I have attached the troubleshooting steps for Code P0171 below for your reference.

Please let me know if you have any questions.
Thank you.

Images (Click to enlarge)

Jan 5, 2022 at 11:58 AM