2001 F250 7.3 drops acceleration to idle - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 08-22-2008, 08:23 PM Thread Starter
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2001 F250 7.3 drops acceleration to idle

I am currently experiencing a problem with the acceleration dropping to idle, when this happens the water in fuel, service engine soon and wait to start light come on for a brief moment. When it happens, I can let off the pedal and get right back on it and the power is back. It is sporatic in happening, it has happened even with the cruise control on.
So far, I've changed the cps, the fuel filter, the ignition switch. I recently had it in the shop because it died and wouldn't start. They changed out the electronic control module, I think thats what it was called. While in the shop
they checked my injector pressure and said it was good at 2000 psi.
When this happens no codes are being stored. Was checked with my OBDII reader and the one at the shop where I had the work done at with whatever he used (looked like a keyboard made by Snap-On).
Any help on this is greatly appreciated.
Clay

Last edited by cdwhite68; 08-22-2008 at 08:28 PM.
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post #2 of 14 Old 08-24-2008, 09:54 AM
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Originally Posted by cdwhite68 View Post
I am currently experiencing a problem with the acceleration dropping to idle, when this happens the water in fuel, service engine soon and wait to start light come on for a brief moment. When it happens, I can let off the pedal and get right back on it and the power is back. It is sporatic in happening, it has happened even with the cruise control on.
So far, I've changed the cps, the fuel filter, the ignition switch. I recently had it in the shop because it died and wouldn't start. They changed out the electronic control module, I think thats what it was called. While in the shop
they checked my injector pressure and said it was good at 2000 psi.
When this happens no codes are being stored. Was checked with my OBDII reader and the one at the shop where I had the work done at with whatever he used (looked like a keyboard made by Snap-On).
Any help on this is greatly appreciated.
Clay
Something about your computer doesn't sound right. If your SES light came on, there should most definitely be a code stored @ least in the continuous memory. Did you have a chip/module @ one point? If you did, was it pulled while the rig was running?

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post #3 of 14 Old 08-24-2008, 10:09 AM
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look through the ford TSB's. I saw something about about that same problem.

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post #4 of 14 Old 08-24-2008, 10:28 AM
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I had that happen in my 02 2 days after I installed my Bully dog chip it ended up the chip lost all the programming. I pulled it out and it ran fine. The chip plugged into the computer not the obd port
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post #5 of 14 Old 08-24-2008, 10:33 AM Thread Starter
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No chip that I'm aware of, the only work thats been done on the truck besides regular maintenance is Ford replaced the CPS which fixed the problem of dieing. 5 months after that was replaced the truck died and would not restart. Put it in the shop and the guy replaced the CPS again, nothing, replace the wiring harness because he said there was no power getting to the ECM and then replaced the ECM.
On, the day of pick up from the shop it lost the pedal once, turned around and took it back to the shop and the guy drove it with me in the truck and didn't do it. He hooked up his Snap-on reader and it gave no codes. Started to leave a second time and it did it again before I got to the end of the parking lot, spun it around and took it back again and had him hook up since the lights were just on and back out again. Yet again no codes. He put the truck through some kinda diagnostic with his Snap-on module. And everything checked out fine.
He said that since the SES the WTS and the WIF was coming on he suggested replacing the ignition switch. Did that and still have the same problem.
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post #6 of 14 Old 08-24-2008, 10:43 AM
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have you looked at your throttle position sensor yet?
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post #7 of 14 Old 08-24-2008, 10:52 AM Thread Starter
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I used a VOM to check the TPS and after 20 minutes of pressing and releasing the pedal and watching the VOM it never dropped voltage, and even when the truck would not accelerate when pressing the pedal the voltage still increased as you pressed on the pedal. I could go up and down all I wanted to and nothing, until you let completely off the pedal it would then accelerate again.
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post #8 of 14 Old 08-24-2008, 11:05 AM
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UVC Harness? Is it coming loose?

Also, what color is your new CPS? A lot of people have had problems with the new gray ones that Ford is using now. It would be worth your effort to try and put a black one in and see how she runs.

Chris

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post #9 of 14 Old 08-24-2008, 11:11 AM Thread Starter
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UVC stands for?? I don't know all the abbriviations. I've had 2 different grey CPS since this has started.
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post #10 of 14 Old 08-24-2008, 11:13 AM
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had a similar problem a few months back. ended up being my IDM was dying.

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