Truck losing power under load, please help! - Ford Powerstroke Diesel Forum
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Old 03-05-2011, 04:52 PM
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Truck losing power under load, please help!

Two days ago I started experiencing a loss of power and shaking under load. It doesn't happen all the time, mainly after a 30+ minute drive and when going up hills. It starts out as a minor miss and then eventually the entire truck will start shaking and I will lose all power. At that point I have to pull over and let it idle for a while and then I can normally go again for a short distance but it will come back as soon as I have to accelerate moderately. During this time the EGTs go through the roof and today when it happened my OD off light started blinking. I replaced my ICP sensor as it had oil in it but that didn't make a difference. I also just went from the 1st Gen RiffRaff FRx to the 2nd Gen. I contacted Clay and he said that the FRx can't cause this problem. I picked up a new fuel pump from Napa today, but before I install that I wanted to find out if anyone had advice for me. Since the new FRx runs at a higher PSI I am wondering if my stock pump is wearing out and can't handle it? Thanks in advance for any help!
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Old 03-07-2011, 07:25 AM
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Never mind, I figured out the problem.
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Old 03-09-2011, 03:57 AM
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Truck losing power under load

Hey Brother, I have the same exact issue on a 2002 E-550 7.3L. What fixed your problem? Thanks.
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Old 03-09-2011, 08:53 AM
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Well......unfortunately I won't be able to help you much. It turns out that I was an idiot when I installed the Gen.2 system. The plunger goes into a housing that I thought was cast as part of the fuel bowl. That housing is actually a separate piece and I didn't see it fall out when I was doing the install. When I started troubleshooting this past Sunday and I saw it laying next to the fuel bowl on top of the motor.....duh!!! So basically I had little to no fuel pressure as the plunger had nothing to compress against.

If I were you I would check your ICP sensor first as I had to replace mine as it was causing weird missing problems. Then I would check your fuel system front to back. From what I have heard the fuel pump can get clogged up internally and can't keep up with the pressure under load. Good luck, sorry I can't be more help.
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Old 03-11-2011, 09:41 AM
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Truck losing power under load

Thanks Brother. I dropped the tank and found it full of rust and sediment, which was clogging the prefilter in the tank. I appreciate your fast reply. This website has some great info and people like you that are willing to help make it even better. :-)
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