Okay guys, I'm at my wits end. I'll apologize in advance if this turns into a long post, but someone PLEASE help me. First of all, I'd like to introduce myself to the forum - my name is Shane and last week I bought a 2005 F-250 Crew Cab Lariat FX4. The truck has 173,000 miles, but it's in REALLY good condition, and I got a smokin' deal on it. I'm loving this rig, except for one thing. She frequently stumbles and looses power just off idle, like when you're pulling off from a stop.
I've been researching the board here for awhile, and apparently A LOT of people have the same problem out of this 6.0L. While I see multiple threads about the same issue, it seems there are a couple of different solutions.
When I bought the truck, nothing was wrong with it at all. I drove the truck home to Greenville SC from Atlanta. I ran 80-90 MPH all the way home and the truck did great. The next morning, I was going up a hill and she lost power and started billowing smoke out the tailpipe. I pulled over and shut it down immediately. The only thing I could think of was that I ran it too low on diesel. After looking over the truck for anything obvious (and finding nothing), I started it back up. She idled fine, but any input on the go peddle made it stumble badly. After pulling my hair out for a bit, I decided to just floor it to see what would happen. She sputtered for a bit and then cleared her throat and roared back to life.
All seemed well for a few miles, but then it started with this off idle stumble issue. It's so bad that I'm afraid to make a left turn across traffic - I don't know if it'll make it through the intersection. If I shift to neutral and floor it, she will clear up and run right again - usually. On the highway she runs great, but as soon as I slow down it will act up again.
The first thing I did was change the fuel filters and drain the water separator. I also put a full tank of fuel in, and added a little bottle of Lucas fuel injector stuff. And I've spent HOURS reading over this forum. I took the truck to a local Ford dealer to let them tell me what was wrong. I told them that I was pretty positive that the ICP sensor was the culprit. After a few hours, the dealer called me back.
They said that the EGR valve was sticking, and the intake (EGR?) was clogged with carbon. This was something they couldn't do, and had to send it to a "specialist". Oh, and my turbo needs the center section rebuilt. All this will only cost me $2700 (
), and it won't guarantee to fix my problem. When I asked them if the ICP sensor was functioning properly, they told me that it was fine, and I needed to fix the other things before they could do any further troubleshooting. I called them out on the fact that I wanted them to check the ICP sensor and they didn't do it. Then the guy tells me that he can put the truck back in the bay to check it, but he would have to charge me twice - I had to restrain myself on that one...
So I get the truck home (anyone still reading this?), and pull the EGR off. She was pretty nasty, and after a half hour of carb cleaner and a worn out toothbrush, she looked like new again. When I went to hook it back up, I noticed that the wires at the plug were frayed. I wrapped them back up with electrical tape and some new wire loom. Jumped in the truck to see if she was healthy. No luck - still having issues.
I read a post from a guy that was a few hundred miles from home with ICP troubles. He unplugged the sensor and drove home. He said the truck drove sluggish, but otherwise was fine. So I tried to do the same with my truck. I unplugged the ICP sensor and went around the block. Now it's running worse than when the sensor was plugged in. It took a mile or two before it acted up, but it never would clear up and run right. I had to limp it back into the driveway. I was hoping that if my ICP sensor was bad, this would be a way to test it (since the PCM supposedly runs default values when the ICP is unplugged). No deal.
So like I said at the beginning of my post, I'm at my wits end. I don't know what else to do, and I guess the next step for me is to spend $140 on a new ICP sensor. If that doesn't fix it...