Well I have been noticing a slight loss in boost and power over the last couple of weeks. A month or two ago i did the 6637 mod, 3"to 3-1/2"dp, and cleaned the fuel screen. I noticed a very nice improvement and my boost was all they way up to 20PSI. 21 PSI if I really pushed it up a hill. Before the mods I was about 16 psi. Today I was running from work site to work site up a few grades and decided to punch it up the hills. Well now I am lucky to get 17 psi, and it just didn't feel like it had as much power as it should. Especial above 2500 rpm. So I got home tonight and checked the screen, it was clear. I then put a new fuel filter in, and filled the reservoir up with atf. I took it out and romped on it as much as I could (in the city). And it felt like it was slightly missing or hesitating some of the time. I couldn't tell if my boost was back though because I was in the city and i couldn't get a long enough stretch. I also checked the air filter and boots on the intake. Nothing seemed wrong with anything. I am kinda scratching my head now. Oh, i also checked to see if I had an exhaust leak before the turbo but couldn't see anything. Oil was changed 1k miles ago.

Anybody have an ideas? I am going on a trip this weekend pulling an equipment trailer to pick something up and I am kinda bummed it is not running like it should.

 

could be bad MAP sensor are pluged up hose going to the MAP

 

Where is the map sensor? And is it possible for it to be bad and not throw a DTC?

 

Hmm, ill try unplugging that tomorrow and see what happens. Anybody think It would be a problem if I put a gallon of atv in the rear tank with like a gallon of diesel? Just to clean the injectors a little better.

 

Well it for sure is down on power. Today I can just muster 15psi. I can also tell it is slightly missing in the higher rpm range. Any ideas, I am pretty bummed cause I am leaving on a trip today. I did notice the lookes like there is fuel leaking out of the FPR on the side of the bowel. I will run over to international and see if they have one. I will also go buy a cheap tire pressure gauge and check the fuel pressure. Any other ideas?

 

How many miles on the oil ?(& is it full)?.. & what is the Fuel pressure ?...

 

where you at as well, lotta stations are mixing 1 and 2 diesel for a winter blend because of the temperatures, I get at least a 30% loss in mileage because of this and it has half the power as well......

 

I changed the oil a little over a thousand miles ago. I also checked the fuel pressure and its at 55psi. I am in southern oregon and It doesnt get below freezing very often.

I may have found my problem though. The o ring between the fuel bowl and the fuel pressure regulator was broken and missing a big chunk. Where can that chunk be? I am sure it could mess some stuff up. I don't have time to mess with it because I need to leave. So I am going to run down to international and match an oring then just cross my fingers and hope I dont get stranded on the side of the road. I have no time to track down that pc.

 

Well i was pretty dissapointed in my trip. Most of the hills I could speed up last time I pulled this trailer over the pass. This time I slowed down on most all of them. I really dont know where to start. I think it is fuel related and not oil related. It runs fine for about five seconds after I put my foot in it, but then just seems like it starts to run out of fuel. Starts missing and just loosing power. Where is the most common problem for the fuel system to get clogged up? I already changed the fuel filter and checked the screen. At idle it had 55 psi. Anybody know were to start? This is very frustrating. Thanks guys.

 

Might have to plumb in a gauge to read fuel pressure under load ...You may also need to get some real time data form a scanner under load also...

 

just a try a few weeks ago my truck would idle fine rev up fine but on the highway it felt like it did not wont to go and it had what seem to be a miss but it was my TPS cutting out and had no codes might be something check in to

 

I will try check that out as well if what I did didn't work. I took the fuel bowl out and the fpr. I took everything all apart and blew threw everything with a compressor and cleaned it all real well. It wasn't bad at all. A little bit of junk at the bottom of the bowl and that was it. What I did notice though, was the brass nut that holds the magnetic solenoid on the IPR was in the valley and the solenoid was moving all over the IPR. My fault, I was the last one to take the IPR out. So I am hoping that was the problem. I will find out tomorrow when i pull the trailer to my shop. I never did find that piece of o-ring. I doubt it made it inside the fuel system though. The more I looked at where it came from the more I find it impossible it was in the fuel system. I think it just fell down into the valley.

I am going to re-seal the intakes on the heads though. They both seem to be seeping pretty bad. Where does all the oil come from? I know the valve cover vents right into the intake, but my truck doesn't use any oil so i was surprised to see how wet it was around the intakes. Especially the passenger side. What do I use to reseal them? Why do the power stroke engines vent into the intake. While the T444E engine vent to the open air? Must be for emissions.

Amazzing how many small things have gone wrong after I hit the 200k mark. I am now at 210k.

 

Was it down shifting with no buttox behind it? I ask because I have had a seen a BIG change in fuel consumption and I didn't notice a performance problem at FIRST but I believe I am experiencing some now. I have a EPV code (cause it is unplugged) and a right bank GP code (cause I need GP's). I can't find the problem

 

mine didn't down shift and no CEL an no codes did you mean EBPV is so it should not set a code cause it's unpluged

 

Unfortunately my CEL is burned out LOL (sigh). But on the Cali model (that I am blessed with) it will throw a code. I think I am just going to bight the crappy milage bullet and change the GP's, injector O rings, fuelbowl/FPR rebuild, and IPR kit this spring.and see what happens. I was just inquiring b/c I hate using so much fuel. Thanks again fordpride.