Rough idle, loss of power and heavy vibration when accelerating? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 06-01-2012, 02:14 PM Thread Starter
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Rough idle, loss of power and heavy vibration when accelerating?

I have a 99 f350 7.3 that was driving fine all day, when I stopped to fuel up all of a sudden I had no power it idled rough with a real deep low tone and when I would accelerate the whole truck would vibrate violently. I was able to limp home but now I'm stuck I can't see any diff on the suspension or engine? I also didn't hear my turbo and couldn't get above 40 and once I got to my driveway it almost died goin up it????? Any help would be great...



1999 F350 7.3 PSD 4x4 CCLB
Rough Country 6in lift with 37 BFGs
TS 6 POS Chip, 5in straight pipe, 6637 intake, T500 HPOP, Air Dog Fuel System, Riffraff FRx


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post #2 of 11 Old 06-22-2012, 01:49 PM
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Same thing just happened to me, half hour from home, not sure if I want to chance it or not

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2003 F250 7.3L ECLB
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post #3 of 11 Old 06-22-2012, 01:51 PM Thread Starter
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Mine ended up going away but when I get on it pretty good it will come back then go away again, not quit sure what the deal is though



1999 F350 7.3 PSD 4x4 CCLB
Rough Country 6in lift with 37 BFGs
TS 6 POS Chip, 5in straight pipe, 6637 intake, T500 HPOP, Air Dog Fuel System, Riffraff FRx


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post #4 of 11 Old 06-22-2012, 02:28 PM
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I got her about home now and then i'm going to do some searching, but it is getting worse and worse right now

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post #5 of 11 Old 06-22-2012, 03:05 PM
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What could be happening is that the engine has dropped cylinders because of the electrical connections under the valvecover (UVCH) are poor. It's not uncommon, and the first thing I would check...

http://www.youtube.com/v/GHwjEfJtM_g&hl
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post #6 of 11 Old 06-22-2012, 03:21 PM
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i'll check that, but my main concern is that it isn't even throwing a code at all

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post #7 of 11 Old 06-22-2012, 03:36 PM
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You have the right equipment to read our codes? You know a Generic OBD-II reader is of little use for this engine...

To diagnose a UVCH issue you need something that will read IDM codes, perform a Buzz Test, and then retrieve the results from the IDM again.
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post #8 of 11 Old 06-22-2012, 04:41 PM
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No i don't have the right equipment I just mean that my SES light hasn't even come on

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post #9 of 11 Old 06-22-2012, 04:52 PM
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probably either a UVCH or a fuel delivery issue. Did it start right when you fueled up? If so you may have an obstruction

1996 F350 4x4 CCLB-- I'll miss her

1996 F350 4X4 RCLB zf5 213K
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There u go Tom. John may not be sexy, but he can tutor you, lol.
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post #10 of 11 Old 06-23-2012, 09:17 AM
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Yeah it started right up as normal, going to pull of the valve covers and have a look today

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