help needed - rough running truck - Ford Powerstroke Diesel Forum
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post #1 of 56 Old 02-12-2014, 04:58 PM Thread Starter
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help needed - rough running truck

Last week while driving my 2000 F350 normally, the engine started running very rough. I was running my DP Tuner 80hp economy tune at the time. No SES light or significant codes. Truck starts easily, idles smooth, but runs very rough when driving and is down on power. Replaced CPS, no change.

Took to dealer after reloading stock tune. Dealer pulled two codes, P0470 and P1280. Recommended replace EBP sensor and clean tube and ICP sensor. Cost would be $1100. I declined.

Replaced EBP sensor and cleaned tube(it was clogged). Made no difference.

When I drove today, ICP looked to be in the normal range (~650 at idle, 1200 to 2300 when driving) and IPR duty cycle looked OK (~10 at idle and did not exceed 36 when driving). Measured by DPTuner Infinity.

Ordered ICP sensor and picked up IPR valve.

Am i on the right track? Other ideas? Thanks.
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post #2 of 56 Old 02-16-2014, 10:18 AM Thread Starter
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Still P0476. Pulled EBP to recheck tube. It was open. reinstalled.

Installed new ICP sensor. There was some oil in the top of the old sensor.

No other codes. Truck still runs like crap. Starts easily, idles smooth.

IPR? Anything else to check?

Thanks.
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post #3 of 56 Old 02-18-2014, 02:15 PM
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Pull the valve covers and check the UVCHs. It could be that one side or the other is starting to back out and causing intermittent contact.

2005 F250 CCSB FX4 6.0
2003 Excursion 6.0 4WD
1997 F350 CCLB 4WD 7.3
1996 F250 SCLB 4WD 7.3
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post #4 of 56 Old 02-25-2014, 05:04 PM Thread Starter
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Pulled both valve covers. Under VC harnesses were slightly loose but not burnt connects or signs of arcing. Reconnected and re-installed valve covers. Still runs like crap. Starts easily, idles well, no codes.

I plan to install a new IPR valve this weekend. Any other thoughts or parts to check. I am out of ideas.

Thanks.
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post #5 of 56 Old 02-26-2014, 10:09 AM
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How much fuel do you have in the tank?

2005 F250 CCSB FX4 6.0
2003 Excursion 6.0 4WD
1997 F350 CCLB 4WD 7.3
1996 F250 SCLB 4WD 7.3
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post #6 of 56 Old 02-26-2014, 12:24 PM Thread Starter
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About 3/4.
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post #7 of 56 Old 03-02-2014, 12:31 PM Thread Starter
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Update:
Replaced IPR. Did not help. Engine still runs rough. Starts easily. Idles well.
When first driving after replacing IPR, I did get a SES and the code that came up was P0344.

Using DP Tuner Infinity:
KOEO- No Codes
KOER- P0476 and P0541
Buzz Test- No codes
Cylinder Balance test- No codes

I have replaced:
CPS
EBP
ICP
IPR
Checked UVCH on both sides (did not see any real issues)

Not sure what to do next.
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post #8 of 56 Old 03-03-2014, 01:00 PM
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If you have a stock muffler check to see if the muffler is clogged. Also check the orientation of the exhaust backpressure valve (which is found at the turbo outlet/ downpipe) Even though you might have a new sensor and clean tube, the solenoid/ actuator or electrical connector in the turbo pedestal might be bad or leaking oil. (Check to see if there is oil below the turbo. Also check your up-pipes for leaks (lots of black soot at the top where the two pipes leak). Last but not least, check your oil level.

Does It run rough all the time or only at a specific load or speed?

00 Excursion 7.3 (1.0 Ex. hsng., 3.5" downpipe, Aero Muffler, Banks WG, Banks Comp. Wheel, AFE Stage 2 Air intake, HPX, IAH delete, DP- Tuner F6, Riffraff Boost Fooler, Melling Oil Pump), Fuel lab 41402 pump and regulator, fuel bowl delete, 910 Comp Springs/Shims, DI Pushrods, Swamps HVHF IDM, SRP 1.1 HPOP Dieselsite trans and coolant filter, 203* thermostat, Sonnax valve 0.427 and tricumulator springs, Lift, MM Hubs, 35's and 3.73s, 08 diff cover, Hellwig rr. bar
326RWHP @ 731RWTQ.
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post #9 of 56 Old 03-03-2014, 03:35 PM Thread Starter
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Thanks for the feedback.

Exhaust is aftermarket stainless steel 4 inch turbo back. Oil level is at the top of the cross hatch area on the dipstick and looks clean. I will check the up pipes. How do i check the orientation of the exhaust backpressure valve?

The engine idles well. Seems to run really rough from about 1300 to 2000 RPM. But feels down on power across the board.
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post #10 of 56 Old 03-03-2014, 03:35 PM
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You said you have replaced the EBPS. Did you check the condition of the tube that runs from that sensor to the pass side exhaust manifold. It can become clogged with soot or have rust eat a hole through it.

2005 F250 CCSB FX4 6.0
2003 Excursion 6.0 4WD
1997 F350 CCLB 4WD 7.3
1996 F250 SCLB 4WD 7.3
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