I took my wife and kids to Temple to get away from Hurricane Rita. I pulled my travel trailer. Everything was going fine for about 3 hours, in heavy traffic. My truck started missing and shifting funny. It would bog down and not shift correctly. It continued to do this, so I stopped and checked the transmission fluid it was fine. I didnt realize it was a miss at first it felt like the transmission was slipping. After restarting the truck it ran fine for a while longer then it started missing and bogging down and shifting funny. Again stopped turnrds it off and restarted it and it was fine. I dropped the trailer in Temple and turned around to head home, I work for SBC so I was on call for the storm. The truck did the same thing with no load on it. Ech time I could turn it off and restart it and it would be fine. No service engine light came on, it never got hot, the gauges were right down the middle. After reading a bunch of posts on loss of power I thoought it might be a COP. So I tok it to Auto Zone to have the codes read 2 Came up P0171, P0174. What do these codes stand for, the guy at AZ was not alot of help he just wrote them down for me. I just got the truck last month. f350 CC LWB 4wd v10

 

Can't help you with the codes, but a lot of people seem to clear up misses and intermittant running problems by changing the fuel filter.

 

Your codes mean that the computer detected a lean condition on both banks. P0171 means one bank, P0174 means the other. (No I don;t know which is right and left. )

Missng and bogging down sound like a bad COP but the weird shifting doesn't.

Explain how it doesn't shift correctly.

How many miles are on the clock?
Didjya do anything to the truck prior to the drive?

 

The lean codes are probably a dirty MAF or a vacuum leak.

Check the dreaded PCV elbow, and all other rubber "intake" related hoses.

Then, pull the MAF - using a torx anti-tamper bit, and use brake cleaner to clean it off.

Someone else had almost the exact same problem, they found a leaf stuck to the MAF wires

Of course, the lean code could also mean a clogged fuel filter, but the above checks are free except for the brake cleaner.

With a dirty MAF or bad vacuum leak, the motor will not know how much air is getting in, and therefore the shifting will be screwy too.

Let us know what happens!!!

art k.

 

Those two codes are set when the PCM cannot compensate the fueling rich eneough to deal with a lean condition in the engine. Since you set codes for both banks, this tells me that there is probably an unmetered air leak somewhere. Somewhere that is common to both banks. Could be a vacuum line disconected, maybe the air filter housing isn't closed correctly. You mention that you just got this truck, but is it new??, if not how many miles are on it?. Was there someone under the hood recently?. If it is not any of these simple things, then it may be an intake manifold leak, or possibly something wrong with the MAF, but I would think that would set additional codes.

 

The truck has 169000 miles. I did not do anything to it before the trip other than check the fluids. I changed the fuel filter today hoping that was the problem. The old one was as clean as could be. I could blow through it with little resistance. I am going to check the things mentioned above. I will post back after checkimg these. The truck pulled the trailer with no trouble for about 3 hours then suddenly had trouble.