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Old 11-10-2008, 04:41 AM
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Slow throttle response

I have a 2004 F250 w/ 94,000 miles.

In the last month my throttle response from dead stops has become dangerously sluggish. It can be a 3 or 4 count before the turbo spins up and the truck takes off. If you pull into moving traffic you get alot of nasty looks when the truck barely moves. I have replaced my air and fuel filters with no improvement. At first I thought it may be the tranny, so I had it serviced as well, but you can hear the turbo spin up and that is when she finally takes off, so I dont think it is tranny related. My local dealership wants the truck for over a week, I would really like to try and fix it myself.

Any suggestions?
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Old 11-10-2008, 12:15 PM
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Sounds like VGT in the turbo is hanging up. At 94,000 miles, it should still be covered under warranty, if you are within 5 years of your warranty start date. I wouldn't recommend attempting to fix it yourself, if you are inexperienced, and cannot afford a lot of down time.
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Old 11-10-2008, 01:54 PM
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Thanks for the response.

I am trying to get it in the dealership for warranty work but they are backedup 7 days.

What is the VGT? I am not an experienced mechanic, but I have rebuilt a few engines, years ago, and do all my own service.

Thanks again.
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Old 11-10-2008, 02:09 PM
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VGT = Variable Geometry Turbine

The only way to diagnose this concern, is to have Ford's IDS diagnostic scan tool connected, while monitoring VGT duty cycle, RPM, EBP (exhaust back pressure), MGP (manifold gauge pressure) and MAP (manifold absolute pressure) under the condition in which it occurs.

With that said, short of removing the turbo and having a look inside at the turbo vanes and unison ring (which I DO NOT recommend if you are inexperienced), you are better off just driving VERY cautiously until you can bring it in.
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Old 11-11-2008, 03:10 PM
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I am dropping it off at the dealership tomorrow, is there anything I need to request they look at?

- EGR?
- VGT?

Since my warranty is about to expire, I would really like them to do a thorough check of the truck.

Thanks!
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