99 7.3L with no pulling power - Ford Powerstroke Diesel Forum
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post #1 of 44 Old 03-06-2011, 07:51 PM Thread Starter
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99 7.3L with no pulling power

Hello everyone I have a 1999 f350 dually with the 7.3L powerstroke and when Im under a load or attempt to pull something the truck don't have any pulling power. I tried to power b rake the truck and it just sits there and won't break them loss at all. I also found that if i pull up to a curb with the truck empty and no load and try to drive over the curb the truck just can't push its self over the curb. Im getting about 10.5 miles to the gallon. There is no check engine light on. I have checked and /or replaced the air filter,oil, oil filter, fuel filter, EBP Sensor and Tube Cleaning. I also dropped the fuel tank to see if the filter or pump were clogged but everything was clean. I ended up taking the truck to a shop and he put it on the computer to see what he could come up with and everything checked out good except the map sensor. He changed the sensor and still no difference. He did a injector buzz test which was also good. I got the truck back and trying to find out what would cause this lack of pulling power. The truck don't smoke at all and the transmission shifts fine and feels good. The truck don't run rough it runs real smooth. The crazy thing is if I dont have a trailer/load on the truck it actually gets up and goes and is pretty quick. I am out of ideas on what would cause this problem if anyone has a idea i would greatly appreciate it. I need to get this truck running back at its full potential. Something that happen to me that was funny as hell but not to funny is I alway joke around and tell my friends that ill hook a chain the their vehicle drag it like nothing. But one day while they were all there I hooked my truck to a rose bush with a strap that i could have probably pulled out by hand LoL and my truck couldn't pull it out. Pretty sad.
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post #2 of 44 Old 03-06-2011, 11:22 PM
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you need a boost and pyro gauge to see whats really going on? all ic boots are tight and not leaking and the up pipes are not leaking!? it could be a bad HPOP then possibly.. just throwing ideas out there for ya.
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post #3 of 44 Old 03-07-2011, 04:04 PM Thread Starter
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Yeah Im going to have to get some gauges and see whats going on. I forgot to mention that I did check the ic boots they were tight and not leaking and the up pipes are not leaking. it defiantly is boosting can hear the turbo and feel when it kicks in. As for the HPOP not sure on how to check it to see if its bad or going bad. Any way to check the pump?
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post #4 of 44 Old 03-07-2011, 04:17 PM
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you need to get AE so you can monitor your ICP and IPR and then you would also be able to a cylinder contribution test


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post #5 of 44 Old 03-07-2011, 05:31 PM
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Originally Posted by o1cbc View Post
I also dropped the fuel tank to see if the filter or pump were clogged but everything was clean.
did you physically pull apart the pickup and check the fuel socks?

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post #6 of 44 Old 03-07-2011, 07:47 PM Thread Starter
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Yeah I took it all apart and checked it out they told me if you have a metal tank that they would start to break down and clog the filter also. But I have a plastic tank. Probably a stupid question but what is a AE

Last edited by o1cbc; 03-07-2011 at 07:59 PM.
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post #7 of 44 Old 03-12-2011, 11:24 AM Thread Starter
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anyone have any ideas on what could be causing this problem.
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post #8 of 44 Old 03-13-2011, 01:11 PM
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Sounds like the engine is running fine, just that it isn't getting power to the ground. Torque converter maybe?
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post #9 of 44 Old 03-13-2011, 07:45 PM Thread Starter
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It could be a possibility didn't think about that. Would you think I would feel the slipping or see the rpms creep with out the truck moving. When I pull up to a curb and try to drive over it the truck will only rev to about 3000-3500 rpms and just stay their. I would kind of think but not sure the rpms would continue to creep up if the converter was slipping.
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post #10 of 44 Old 03-13-2011, 08:11 PM
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I would say that is a transmission issue if your rpms can get that high and the truck not move that is near redline for the motor the reason it is just staying there is probably hitting the rev limiter and that is not good for the motor.

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