Code PO174?

Joe, hello, thank you for answering. I checked all the above, that you said, that is why I was asking about the 2 Terminal purge Valve solenoid. Here is a picture of what I was asking. Also, I just found this burnt plug that goes to the purge valve solenoid. Here is the short trims data freeze.

Joe, codes came back this time a po174 and po171.

Joe, here’s the picture of what I was talking about blowing in purge solenoid.

Will do Joe.

Joe, I was looking around for a vacuum leak an I found this little hose crack good, can this be a vacuum leak for lean code?

This part of the EGR valve solenoid.

Joe, I was going to put evap on but I had it checked and it was good. The one I was ask about, to blow in air was one bought online, and it was bad. So, I put a new IAC valve, because when I can to a stop the truck would acts up And when I would put on the air condition The check engine light would come on all the time Also The truck would pool Like if I was giving it gas. It was running good for about a week, fell the difference right away, But this morning I didn't warm up the truck And as I was driving The check engine light came on. The codes came back PO171 P0174 But I was looking at the scanner and I noticed short-term And long-term trans were looking good But My MAF sensor Was reading 0.01 at idle and also when I was driving. I took it off a few days ago and cleaned it I wondering if I didn't put something back right. Should the MAF sensor be at 0.01 or 0.04 is when I give it gas? Another thing, what would cause the check engine light to come on every time I turn on the heater or air conditioner? Because I know I don't have a vacuum leak I've checked everything from the gas tank all the way around the engines I had put a new PCV valve long time ago about it a year ago and changed it EGR a few things It just seems like This code keeps coming up but the truck is running way better since I changed the IAC. I just want to pass this smoke check. And thank you for your help. You put me in the right direction or letting me know about the short trims and long trims That was really helpful.

Joe, it was going well but a code po 443 po 171 po174. It was driving better than ever but this code can on. I put new evap, MAF, IAC, EGR, DPFE, 02 sensors check for vacuum, fuel pump, spark, plugs, battery. But the same old code always comes up po171, po174 with other codes? So, now I was reading about this code po443 on PCM. I have been reading about the purge solenoid. Remember Back I sent a picture of that burnt spot? Now I’m wondering could I had shorted the PCM because when I test the Evap plug I get power and ground but I don’t know now to check for short in wires. And how do I get a wire diagram for a PCM and the evap purge solenoid? Thanks Joe, I really believe that burnt spot has something to do with the vehicle giving me all these codes.

Thanks so much.

The truck runs a lot better, but it keeps getting a code p2195 and p171, not at the same time, I was testing the PCM to the evap purge sensor and when I checked the Voltage on the connector positive and negative, I get 11.63 Volts and when I put the positive on the connector evap purge and the negative on the battery I get 10.39 Volts, I read something that says they should be the same voltages? Now on 02 sensors I get this code, single biased/stuck lean bank sensor 1. I notice bank 1 sensor 1 and bank 2 sensor 1, both kind of move up and down on scanner but bank 1 sensor 2 and bank 2 sensor 2 stay around 0.710, could the 02 sensors be bad? See I put a four pack of O2 sensors. Supposedly they both to be universal but I noticed all four O2 sensors look the same the two in back 02 sensors are fat and kind of long and I heard the upper stream O2 sensors are supposed to be a little short and fat.

I don’t know what happened, but I wanted to also to say that tomorrow I’m going to do a smoke test but it seems like every time I leave the car sitting for a day or two that’s when I get the check engine lights. I’m kind of thinking the PCM computer is not working right that’s why I’m getting these codes.

On warm up it keeps getting p2195 and pp2197 and I feel rough idling. When I don’t let it warm up, I get the p171 and p174 on same banks 1, 2 and 2, 1. I patched all the exhaust pipes and muffler for cracks and holes. How about the purge solenoid? Voltage. The 11.63 and 10.39 V?

Joe, I have a question about the O2 sensors for my truck. What is the ohm resistance for the O2 sensors? I was testing them today, on my upstream I’m getting 3.3 Ohm one side and the other side I am getting 15.2 to 10.4 ohms. These are new ones I just put on and that why I am getting these codes p2195, p2197, on the old 02 sensors I only got one code. Someone told me that the ohms resistance should be 10 to 20 ohms?