Not only that, but damage to the cat converter if you keep driving with a bad injector.

 

x2...

Who knows, one of the o2's might be contaminated with gasoline... giving out wierdo readings to the computer... it's hard to tell.

 

Defiantly a possibility, sadly, some of the 05's have bad injectors and when they start to go, who knows what cause and effect can happen to the o2 sensors. But it can't be a good thing. Good point.

 

Well I've been doing a lot of reading here and you guys are right, it very well could be an injector. If it sits for a long time it might be losing some pressure making it hard to start. When I go to start it, if it doesn't fire up right away then I'll turn the key off then back on and wait before I start cranking and I've been having good luck that way.
I erased the codes last night and the CEL came on again today, (Misfire on #7 Cyl).
As soon as I can I'm going to take it to the dealer. Hopefully they won't freak out when they see my AirForce One intake.
I also read here that Ford was extending the warranty on the injectors for the '05's to 100,000 miles. I don't remember ever receiving anything in the mail about that.

 

If it is truely an injector issue... then wrench007 and I are good.

Yes, they did extend the warranty on the injectors for your model year up to 100,000 miles.

Just take it really easy on the truck, until you get to the dealer.

 

Took it to the dealer and it was a leaky injector on the #7 cyl. They replaced it along with the o-rings for all the others and changed the oil. As I was driving home the CEL came on. P0171 (Bank 1 running too lean). Also when I came to a stop it stalled. At every stop sign I had to keep my foot on the throttle to keep it from dying. I don't remember what RPM that it idled at before but now it's at 500 RPM when it's in gear. I'm thinking it used to idle at 750.

 

Sounds like an O2 gone by-by...

But wrench007 and I were right... a leaky injector... sheesh... we should work for Ford.

 

You don't by any chance have a KNB air filter or simular installed? If so, you may have over oiled it and contaminated the MAF sensor which would set this code.

One of the most common causes of Ford P0171 and P0174 lean codes is a dirty mass airflow (MAF) sensor. The MAF sensor is located in the air inlet tube
just ahead of the throttle body. The MAF sensor should be protected from outside dust and debris by the air filter, but sometimes the air filter doesn't fit real tight inside the housing and allows unfiltered air into the engine. Dirt can stick to the MAF sensor wire and form a coating that slows the response of the sensor to changes in airflow. The MAF sensor can also be contaminated by fuel vapors that back up through the intake manifold and throttle body when the engine is shut off. The vapors can leave a waxy coating on the sensor wire. This causes the MAF sensor to under report airflow, which in turn misleads the powertrain control module (PCM) so it doesn't add enough fuel to maintain a properly balanced air/fuel ratio. As a result, the engine runs lean and sets a P0171 and/or P0174 code (see Ford TSB 98-23-10 for details).

I've tried cleaning the MAF sensors many times, but ended up replacing it.
Something to think about, maybe the fuel vapors from #7 injector contaminated it too a double whammy, just a thought.