04 LLY No power under heavy throttle or on hill climbs!

<HR style="COLOR: #d1d1e1" SIZE=1><!-- / icon and title --><!-- message -->I have a truck at work that we can not figure out and I thought that you guys would know much more than we would. Its a 04 1/2 LLY 3500 reg cab. It has no power when you want to do anything but just drive easy and will not get up to speed very quick. when you step in to it to pass, climb a hill or just to go faster it will fall on its face and lose speed and then pick back up very very slowy. The other day one of the techs had to prime it just to get it started back up. The codes we have found are as follows PO1093, PO404, PO101 is what I was told. One had something to do with the EGR. We cleared them and took it for a drive and the PO1093 came back very quickly and the others showed up soon thereafter. New fuel filters are one it and that didn't fix it. I even think that we had one dealer replaced the pick up tube and filter in the fuel tank. ( didn't know they had one in there?) We found one buliten about a pinched line come from or to the vac pump??? We have found that the Tech II shows that desired fuel pressure is higher than the fuel pressure readings we were getting from the engine and I know that theat could and is a very big problem to a diesel and I was wanting to know what should we do and if there was anything else to look at? http://www.dieselplace.com/forum/images/smilies/help2.gif

Thanks
Nathan and Kokosing Const. Co.

It is probably the driver's side fuel rail which contains a Pressure Relief Valve. If this valve sticks, it will drain the fuel rail.

Another possibility is that there is a pin hole somewhere between the pickup and the CP3 (high pressure pump on front center of engine).

could be high fuel return rates you need to get to dealer and have them check injector return rates you could have some bad injectors.