03 6.0 low/ no power - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 01-26-2014, 05:52 PM Thread Starter
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03 6.0 low/ no power

Hey guys, new to site. I recently bought an 03 f250 w/6.0 auto. Been sitting for 2+ years. I am new to diesel mechanics but have been a mechanic for 16 years. I diagnose my problems and don't change parts guessing. I have always been a gas burner guy but have fell in love with diesels recently. Having a lower power issue. I have got the truck running by dropping tank and cleaning fuel system properly, new filters for fuel, new oil and filter, new batteries, new starter, fixed ficm, new icp, new bps, cleaned turbo and installed new unicen ring, new cac boots. Starts and runs great. Cranks easy in cold weather. Have Mac mentor pro scanner so I can monitor anything throughout truck. Still can't find any issues with truck but have no power. I'm making boost, have good icp readings. I can sit in park and run rpm to 2500 and hold pedal steady but rpm will fall 750 to 1000 rpm. I'm thinking low fuel pressure. Any ideas?

Last edited by Bleehebner; 01-27-2014 at 06:36 PM.
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post #2 of 17 Old 01-27-2014, 06:38 PM Thread Starter
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Anybody? Ideas?
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post #3 of 17 Old 01-27-2014, 06:47 PM
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Plugged cat?
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post #4 of 17 Old 01-27-2014, 08:06 PM Thread Starter
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Tried that. Unbolted before cat. Actually ran worse. Busting up at 2500. Then falls back when foot held in same position.
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post #5 of 17 Old 01-28-2014, 05:44 AM
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Hello I'm new to this sort of thing. I have an 03 f 350 6.0 that is having issues when cold. I've read some of the threads on this, but haven't found an answer that was specifically accurate to my problem. When I fire it up in the morning it runs rough for a few seconds then sounds alright. But when I don't let it run about 10 min.or so, it is will miss until it gets warmed up. Plus I'm getting lower mpg. I've replaced the ficm recently and I use rotella 15/40 with no other additives. I have 170,0. 00 mi ,third owner and not a clue what's been Done to it. I think it is stock. Any feedback would be appreciated .Thanks, p.s.the info I have read on other problems I've had you have been very helpful.
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post #6 of 17 Old 01-28-2014, 06:27 AM Thread Starter
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Sounds like low voltage output to injectors from ficm
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post #7 of 17 Old 01-28-2014, 06:42 AM
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Could 1 go bad in just a few months? I had a Ford dealer tech do it for me on the side.
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post #8 of 17 Old 01-28-2014, 10:10 AM
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Quote:
Originally Posted by Bleehebner View Post
Hey guys, new to site. I recently bought an 03 f250 w/6.0 auto. Been sitting for 2+ years. I am new to diesel mechanics but have been a mechanic for 16 years. I diagnose my problems and don't change parts guessing. I have always been a gas burner guy but have fell in love with diesels recently. Having a lower power issue. I have got the truck running by dropping tank and cleaning fuel system properly, new filters for fuel, new oil and filter, new batteries, new starter, fixed ficm, new icp, new bps, cleaned turbo and installed new unicen ring, new cac boots. Starts and runs great. Cranks easy in cold weather. Have Mac mentor pro scanner so I can monitor anything throughout truck. Still can't find any issues with truck but have no power. I'm making boost, have good icp readings. I can sit in park and run rpm to 2500 and hold pedal steady but rpm will fall 750 to 1000 rpm. I'm thinking low fuel pressure. Any ideas?
If this thing will start and idle, ICP is 23% or less with 580 ish (1 volt) ICP, there are a few directions this could go. 1. Fuel pressure. It should stay above 45 psi no matter what the load 2. Restricted or biased EP sensor (unless you have the inferred cal) MAP, BARO, and EP should be the same Key On Engine Off. 3. Stuck EGR, or EGR throttle plate. If your intake elbow has a Throttle position sensor on it, you have EGRTP. Make sure the blade isn't stuck in a partially closed position. The blade should be wide open unless the EGR system is active. Happy hunting.
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post #9 of 17 Old 01-28-2014, 04:31 PM Thread Starter
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Ep sensor is new from ford and tube was cleaned, egr is deleted, no throttle plate. So that just leaves fuel pressure. Ordered adapter so as soon as it comes in I can check it
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post #10 of 17 Old 01-28-2014, 04:37 PM Thread Starter
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Now that I think about it I did check MAP, BARO, and EP. EP was at zero and other two matched? What's that mean? EP is brand new from ford
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