6.0 no power while cold - Ford Powerstroke Diesel Forum
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Old 10-12-2012, 10:22 AM
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6.0 no power while cold

2003 f250 with the 6.0. starts fine for the most part, just a little on the rough side. problem is that the truck has almost no power or throttle responce until its up to running temp. FICM tests good, pushing 48.5 volts, i havent run a cylinder contribution test yet though. oil changed 300 miles ago and added 64oz of HSS. problem has been going on since june. and again, no power, terrible throttle responce, and hesitation/ bucking until warm. any idea's anyone?
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Old 10-12-2012, 10:31 AM
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bro its a diesel lol they all are pretty power starved until they warm up.... however they do have enough power to move if you push that petal hard enough but mine runs pretty slow till its about 100 degree coolant temps. and trans likes to hit about 70 degrees as well. im not sure if your saying yours wont hardly move or its just sluggish... when mines cold every time it shifts it losses its power and falls on its face so every time it shifts while its cold i got to give it a little more petal action to get my rpms back up cause when it shifts it falls out of its power band.
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Old 10-13-2012, 03:13 PM
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yeah im aware that they have to warm up, i dont expect to turn the key and run a 9 second quarter mile haha. what my concern is, that it feels like its about to blow up until its warm. it hesitates and misses bad and billows white smoke if i put th pedal down. itll rev between 2000 and 2500 and then gets stuck. once its warm it runs like a beast, with the exception of a slight bump at lower rpm which i believe is due to a bad TPS. thanks for your reply though, this is the first diesel ive owned so i may just be paranoid...
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Old 10-13-2012, 03:27 PM
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More then likely you have injector issues going on. How many miles are on it and do you know if any injector work has been done to it? Really sounds like injector issues to me especially since FICM voltage tests out ok.
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Old 10-14-2012, 04:13 PM
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its got around 150000 on it. that i know of no injector work has been done. i added HSS about 500 miles ago with the oil change, and it seems to have made things a little better but theres still plenty to be desired. im going to order a new TPS soon, since that has thrown a code multiple times, and see if that helps any. i need to get a cylinder contribution test i guess
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Old 10-14-2012, 05:14 PM
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Your description exactly matches what mine was doing a year ago. No codes or tests to narrow it down. Set of new injectors was the solution runs better than ever now.
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Old 10-15-2012, 12:39 PM
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man i hope thats not the solution, thatd be a load of cash i dont have. but thats been my main suspicion for a while. im hoping the oil addative might clear it up.
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Old 10-15-2012, 12:50 PM
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I'd really bet in injector issues but you could narrow it down by doing injector cutout tests. More then likely though you should just replace all of them. Rev-x would probably help but it's not going to make it 100%
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Old 10-15-2012, 03:34 PM
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yeah i've considered doing cut out tests, but i dont see a way to test the four on the right without removing the air intake, degass tank, and FICM. im with you though, id put money on bad injectors. thing is, short of taking a loan out its gonna be a while before i can drop that much into it. if i could figure out that one or two were bad i could fix those and hope that it got me by for a while
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Old 10-15-2012, 03:50 PM
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should check the injectors, happened to me and only like 2 were actually good, get em changed and it starts up fine and goes, turbo lags a little but you should let it warm up for a few minutes

unless its a 7.3
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