I've struggled to figure this one out, and let it go with the check engine line on for a while because it is running well and mileage hasn't seemed to change either. But I'm thinking about selling this van soon and would like to get this problem fixed so the light isn't on.
I'm now getting a P1174 code to set after a few minutes of driving after resetting it. I've replaced the pre-cat O2 sensor, replaced the MAF sensor, and checked the purge valve above the fuel tank. As stated above checked the fuel pressure which may be a little high, I ohm'd out the injectors and get similar readings on all 6 injectors within acceptable range. I have also reset the alcohol % calculation a couple of times because this is a flex fuel engine. I can't figure out why I keep getting this fuel trim code. What else can I test???
Does anyone see any readings out of normal range? Here is the freeze frame data that my scanner gave me the last time it threw the P1174 code (pictures attached, but I'll type text below also):
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
Thanks for the help!!