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Username Post: P1174 code on 2008 Uplander        (Topic#361326)
Posts: 1

Reg: 06-09-20
06-09-20 03:50 PM - Post#2796019    

I have a 2008 Uplander with 3.9L engine. I'm at a loss trying to figure out a P1174 code Fuel Trim cylinder Balance.

What I have done so far:
1. Replaced upstream O2 sensor (only 1 on this vehicle)
2. Cleaned, then replaced MAF sensor.
3. Reset the alcohol % in the computer and confirmed it calculated the value pretty closely after the reset (flex fuel engine).
4. Tested fuel pressure. I get about 60 PSI key on but engine off, 67 PSI with engine running at idle. Operating range I found was 59-62 so this seems a bit high but I don't know what I can do to change this.
5. Tested injectors by doing ohm check on each one, all tested very similar and within acceptable range.
6. Checked barometric pressure from scan tool is close to actual. Computer reads 28.6 when weather reporting station says it is 29.9, I don't know if that is close enough or what I can do to change this.
7. Removed the purge valve from the canister above fuel tank and cleaned and tested it for proper operation.

After I clear the code it resets within a few minutes of driving. My scan tool gives some freeze frame data when the code sets, I'll list it here. Does anything look out of range? I'm at a loss on this one, not sure where to go next. Maybe I missed something in the things I have tested already, any suggestions welcome! Thank you!

Data from when the code is set in the computer:
Fuel Sys 1: CL
Calc LOAD(%): 27.4
ECT(deg F): 168
STFT B1(%): -1.5
LTFT B1(%): -4.6
MAP(inHg): 12.4
Eng RPM: 1087
Veh Speed(mph): 44
Spark Adv(deg): 8
IAT(deg F): 109
MAF(lb/min): 1.091
TPS(%): 25.4
Run Time (sec): 169
command EVAP(%): 52.5
Fuel Level(%): 52.5
Warm-up DTC Clr: 2
Clr Dist(mile): 1
EVAP P(inH2O): -0.584
BARO(inHg): 28.6
CAT Te 11(deg F): 1344.2
ECU Voltas (V): 14.094
LOAD Value(%): 19.6
EQ ratio: 0.999
Rel TPS(%): 11.7
Ambient(Deg F): 109
TPS B(%): 25.4
ACC Pedal D(%) 19.2
ACC Pedal E(%): 9.4
Command TAC(%): 16.4

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