HI thanks for reading i recently got the code
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

now the important thing is i before this code is throun i used carb cleaner to clean the MAF sensoer i don't know if that contaminated or spoiled it

here is the test for the MAF data

reference range for MAF on MaxiDAS says the range is 0.00 to 0.66 (lb/s) ok>my car the maf at idle reads 0.01 lb/s and at 3000RPM reads 0.03 lb/s

my question is . is this normal??????????????? tell me what to do please.

i am going crazy i already through 740$ for exhaust manifold 250$ for intake manifold 65$ for HO2S 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

 

14 views no response ?

 

Carb cleaner is very caustic and is not intended for cleaning electronic componets.

CRC MAF cleaner or equivalant is all that should ever be used.

ONLY after the MAF is unpluged should it be cleaned and don't use things like rags or compressed air on it.

ONLY after the MAF is completely dry should it be pluged back in.

 

i know now it is wrong to through carb cleaner on the MAF
BUT MY QUESTION IS TELL ME ITS THE MAF BECAUSE THE RANGE IS GOOD OR BAD
REFRENCE RANGE (0.00 TO 0.66 lb/s)

my maf is 0.01 lb/s at idle 640 rpm and is 0.03 lb/s at 3000RPM

 

tell me what to do is it the MAF or any thing i don't want to through money and the hell code is there P0171

 

Your MAF is toast.

0.66 is your WOT (wide open throttle) range.

MAF reading of 0.03 @ roughly 3/4 throttle you are too lean.

Which is likely why you're getting a P0171 lean code.

 

thanks brother i will buy it and hope the 95$ is the last hope to solve the lean condition

 

I would have answered if I knew. Please post back and let us know if that worked out for you. Hope it does the trick.

 

No problem just don't forget to idle learn the new MAF for about 10 minutes or so.

Then you can run it back to the auto parts store and have the code cleared.

 

thanks bro i will update after the change