08 6.4 rough idle - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 27 (permalink) Old 06-29-2010, 10:32 PM Thread Starter
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08 6.4 rough idle

When I come to complete stop rpms jump around some and idles rough but soon as give it throttle runs fine and smooth...?

1st murdered out 2011 F250 CC SB Fx4 lariat
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2001 F250 CC LB 4x4 xlt maroon lifted up
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post #2 of 27 (permalink) Old 06-29-2010, 10:43 PM
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how many miles? any codes? when was the last time the fuel filter was changed? Also what job? The early 08's had wiring to the high pressure pump get rubbed threw.

2008 F-350 Lariet 6.4L 170,000 km spartan tuned 275 daily
2006 yamaha Vmax
2003 F-350 XLT 6.0L just bought 215,000 km all stock for now.
2003 suzuki 1000 GSX-R
1993 F-250 460
1978 F-150 stock waiting for a paint job

Near GP alberta.

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Last edited by budtoh3zo; 06-29-2010 at 10:45 PM. Reason: Typing faster then mind can think
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post #3 of 27 (permalink) Old 06-29-2010, 10:55 PM
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Could also be an EGR issue.

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post #4 of 27 (permalink) Old 06-29-2010, 11:53 PM Thread Starter
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2008 f250 vin 1FTSW21R28EB59987 91k miles car lot said changed all filters last week.. No cel that I see...

1st murdered out 2011 F250 CC SB Fx4 lariat
2008 F250 CC SB 4x4 lariat dark stone, s&b intake, 5" flo pro straight pipe, 7" flo pro tip, sct livewire custom tuned by Eric @ IDP
Previous Rides:
2003 F250 CC SB 4x4 lariat centinneal black on black modded up
2001 F250 CC LB 4x4 xlt maroon lifted up
1997 F150 EC SB 4x2 xlt red
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post #5 of 27 (permalink) Old 06-29-2010, 11:55 PM
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Hmmmm, could be an injector(s) or EGR. Don't know for sure though. I'm interested if there are codes and they just aren't popping up as CEL's yet.

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post #6 of 27 (permalink) Old 06-30-2010, 12:19 AM
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I keep forgetting about the EGR as mine has been disabled for over 70,000 km. so i got no issues with it. but that is a good possibility.

2008 F-350 Lariet 6.4L 170,000 km spartan tuned 275 daily
2006 yamaha Vmax
2003 F-350 XLT 6.0L just bought 215,000 km all stock for now.
2003 suzuki 1000 GSX-R
1993 F-250 460
1978 F-150 stock waiting for a paint job

Near GP alberta.

CC#58
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post #7 of 27 (permalink) Old 06-30-2010, 12:46 AM Thread Starter
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Injector would have a miss in OD tho.. Runs great on top just missed some at idle... The WIF light keeps pooping up and I just drained tge valve...? Also lieometer says I'm getting 20.2mpg all stock with s&b intake...

1st murdered out 2011 F250 CC SB Fx4 lariat
2008 F250 CC SB 4x4 lariat dark stone, s&b intake, 5" flo pro straight pipe, 7" flo pro tip, sct livewire custom tuned by Eric @ IDP
Previous Rides:
2003 F250 CC SB 4x4 lariat centinneal black on black modded up
2001 F250 CC LB 4x4 xlt maroon lifted up
1997 F150 EC SB 4x2 xlt red
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post #8 of 27 (permalink) Old 06-30-2010, 01:17 AM
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I had a rough idle....almost vibration...when I had injector issues.

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post #9 of 27 (permalink) Old 06-30-2010, 01:27 AM Thread Starter
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Ut zero running issues only idle even at normal operating engine temp? Going to dealer Friday morn.. Why would mpg gauge say getting 20 + mpg?

1st murdered out 2011 F250 CC SB Fx4 lariat
2008 F250 CC SB 4x4 lariat dark stone, s&b intake, 5" flo pro straight pipe, 7" flo pro tip, sct livewire custom tuned by Eric @ IDP
Previous Rides:
2003 F250 CC SB 4x4 lariat centinneal black on black modded up
2001 F250 CC LB 4x4 xlt maroon lifted up
1997 F150 EC SB 4x2 xlt red
http://www.youtube.com/user/6Lstrokin
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post #10 of 27 (permalink) Old 06-30-2010, 01:30 AM
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You said it above....it's the lie-o-meter

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