No power/rough running when cold - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 09-10-2006, 09:02 AM Thread Starter
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No power/rough running when cold

Hello everyone, I have an 2003 F-250 6.0 with 128k that runs very rough and no power only when the motor is cold. I have unplugged the egr no change and no codes in the pcm. I put a programmer on it and it magnified the problem plus blue smoke. If I plug it in at night it's just fine in the mornings. Can anyone explain whats going on? Other than that the truck runs like a top and i love it. Please help.

Thanks Ken

Last edited by y01kxf; 09-10-2006 at 03:44 PM.
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post #2 of 19 Old 09-11-2006, 08:11 AM Thread Starter
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Anybody know????
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post #3 of 19 Old 09-11-2006, 08:31 AM
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Marc will be in later and I'm sure he can help.

2003 6.0 F350 dually on high cholesterol fuel (WVO)
2000 7.3 Excursion also on a high cholesterol fuel



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post #4 of 19 Old 09-11-2006, 09:44 AM
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the 2003 and early 2004 6.0l engines in trucks built before 9/29/03 have injectors that cause this problem. I would say you need at least one injector but most likely more as far as i know the replacement injs were not updated so even if you get new inj they may still develop the samed problem also low fuel pressure wipes injectors out fast. I hope this helps you
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post #5 of 19 Old 09-12-2006, 08:35 AM Thread Starter
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Thank you Psdtech, so if I replace the injectors this can happen again because theirs no updated injectors out for these engines? Whatís the correct way to fix this problem? Can you explain why it runs fine when the engine is warm and doesnít when itís cold. I know Iím asking a lot of questions, but this is got me wondering about these engines now.
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post #6 of 19 Old 09-12-2006, 07:26 PM
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If it were the injectors

there is a 99.99 percent chance it would NEVER clear up. If it does it cold and not when you plug it in at night its a glow plug problem. Check them out. I have put a few GPCM's on the 6.0's.

Oh yeah, not aware of any injector updates on our 6.0's yet. Don't know where that came from. 7.3's had updates back in the day.

Last edited by Jon; 09-12-2006 at 07:27 PM. Reason: More info.
post #7 of 19 Old 09-12-2006, 07:33 PM
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I disagree jon, most of the injectors i see fail only fail a powerbalance on cold start. Some of them in an early failure may only dropp out for 30 seconds, and then clear up. They do get progressivly worse with time, but this gentlemans problem sounds just like an injector or two failing to me.....

Last edited by mschn99; 09-12-2006 at 07:40 PM.
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post #8 of 19 Old 09-12-2006, 07:38 PM
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I wont dissagree with you Marc

but I have never had a bad injector act like that. But anything is possible.
post #9 of 19 Old 09-12-2006, 07:41 PM
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i think i have only seen three or four that were completely dead and i have replaced tons of them:censord: things
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post #10 of 19 Old 09-13-2006, 06:42 AM Thread Starter
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Thanks guys for the info. What exactly fails on the injector?
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