Hi new member need help codes P0171,P0133.P1133 and freeze frame information

[Ali Jamal]

Thanks for reading my Post my Hummer H3 2007 3.7l I-5 with 88000 M on odometer runs like crap lately for last 4 days today i just bought a code scanner to find that it came up with 4 codes which are(P0171,P1133,P0133,P0128) starting by thermostat code P0128 was for stuck open thermostat (P0128 ECT below thermostat reg temp) any way i bought a new thermostat and the temp is back to 1/2 to nearly 3/4 and i erased the codes after a 10 mile trip same fuel in tank the MIL come back showing only 3 codes on scanner

P0171 engine too lean
P0133 O2 sensor circuit slow response B1 S 1
P1133 heated oxygen sensor HO2S insufficient switching B1 S1

here are the freeze frame records

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


please help me out i love this rig and i want to keep it till i find a good lo millage V8 alpha or plan on keeping mine till 200000M

FYI car use is just for off road

TB cleaned every 6 months -air filter changed with new one - EGR valve cleaned it was full carbon - filter is changed every oil change - used oil 10 w 30 AC Delco U.S.A -Coolant changed and radiator flushed at 80000m used DEX coolant - spark plugs changed with the same OEM model at 80000M - trany oil and filter changed every 30000M with dexron VI - MAF is cleaned with Carburetor Cleaner due to no MAF cleaner spray avilable here

Fuel type Super unleaded


now i see drop rpm at stops and accelaration is really crap fuel millage
what to tell 27L For every 100 KM no AC on
car temp is between 1/2 to 3/4 at high speed out city its even 1 mark below 1/2 and outside temp is 20 C

please help me thanks in advance what do i have to do to get it back to normal

 

[Neo]

hopefully one of the real smart guys here will see this and have some good answers for you.

it seems like these 3 codes could all be related :

P0171 engine too lean
P0133 O2 sensor circuit slow response B1 S 1
P1133 heated oxygen sensor HO2S insufficient switching B1 S1

you might start by replacing the O2 sensor , also the Carburetor Cleaner might of removed some special coating on the MAF. i'm not sure if that would cause this or not.

 

[3Hummers]

PM hummech here on the forum. He can walk you through all of the diagnostics.

 

[JGBB04]

also the Carburetor Cleaner might of removed some special coating on the MAF. i'm not sure if that would cause this or not.

Same disclaimer as Neo but YES anything other than cleaning the MAF properly will mess it up & throw codes

 

[Pappibri]

Kinda curious also if the carb cleaner would mess up the MAF. You out of country, no MAF cleaner?

 

[Ali Jamal]

Thx alot Neo i will change them but all i have to know is it the sensor problem or contaminated or air leak or MAF problem or MAP i just wanna know which one is so not to pay $$$ for STH which don't have problem

 

[Ali Jamal]

PM hummech here on the forum. He can walk you through all of the diagnostics.

thanks alot i did waiting for his kind response thanks for the help

 

[Ali Jamal]

Same disclaimer as Neo but YES anything other than cleaning the MAF properly will mess it up & throw codes

yes that may be it and i will change it but for now i just wanna know is it the MAF or HO2S or both?

 

[Ali Jamal]

Kinda curious also if the carb cleaner would mess up the MAF. You out of country, no MAF cleaner?

me to man , my car is running just like crap i even don't drive it now till i fix it by the way i am ot from U.S.A but i love your chassis cars thats why i own a Trailblazer L6 4.2L and Hummer I5 3.7l and Toyota Tundra V8 4.7 L

FYI my hummer is same white color as yours but Model 2007 Luxury with modes i made Winch + lift front and rear + off road lights +Air comp + 110V and 220 v converter + walkie talkie 500 M distance + extra Tire + all terrain 285 75 R16 + extra Electric fan with switch + roof lights + triple Horn + and a shotgun for hunt LOL.

 

[hummech]

hELLO Jamal,
that is a common problem here in the states too. it is the first o2 sensor that is located in the exhaust manafold that is giving you some trouble. we inspect the wires going to the heated o2 sensor first and if all looks good there we replace the sensor. we also have a updated program that gets flashed into the ECM which slightly changes the range that the computer needs to see the o2 sensor variation and it's response time.
if this sensor is faulty, the engine will run poorly and because the system defaults to full rich on the fuel which means you also get poor gas mileage.
good luck,
mike s.

 

[Ali Jamal]

hELLO Jamal,
that is a common problem here in the states too. it is the first o2 sensor that is located in the exhaust manafold that is giving you some trouble. we inspect the wires going to the heated o2 sensor first and if all looks good there we replace the sensor. we also have a updated program that gets flashed into the ECM which slightly changes the range that the computer needs to see the o2 sensor variation and it's response time.
if this sensor is faulty, the engine will run poorly and because the system defaults to full rich on the fuel which means you also get poor gas mileage.
good luck,
mike s.

thanks man tommorow i will change the sensor HO2S ( located in the exhaust manafold ) and update you with the result thanks Mike

 

[Ali Jamal]

today i changed the HO2S the car acceleration is much better now but MIL is back just after i got on road an driving like hell around 3000rpm to 5000rpm to test the performance of the car checked the code is reading P0171 what to do?
the MAF live data at 600 to 750 rpm was 20 and it just jumps to 100 or much more at higher RPM is that correct? any help suggested?

if i put freeze frame info will it help to Diagnose the problem?

 

[Ali Jamal]

long fuel term is 20% is this normal? the authorized PC person told me its too much .

 

[3Hummers]

Time to PM Mike again.

 

[Ali Jamal]

Time to PM Mike again.

yes for sure thanks for you assistance :agree: :thumbs:and thanks for Mr.Mike :sl2:

P0171
short fuel term is 9% and i don't know if its ok ?
long fuel term is 24.2% last test for lean code failed and is this range normal 24.2%? the authorized tech 2 person told me its too much is he right?


If i put freeze frame records will it help to Diagnose the real problem?

Big thank you for this great forum and the Kind persons who help others