Loss of power under hard acceleration - Ford Powerstroke Diesel Forum
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Old 12-23-2010, 01:43 AM
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Loss of power under hard acceleration

Hey there, I got a 1999, 551000 km's, When under hard acceleration you can feel the truck loose power, and then a clicking-tapping noise starts on the drivers side, it sounds like. Before I did my injectors (yesterday) it would start this and then completely die, injectors were screwed, with the new ones you can just let off and then go again.

About the only thing I haven't replaced on this truck is the HPOP, ICP, and IPR, most of the other sensors I have replaced, MAF, MAT, CPS etc.

Fuel filter is new, fuel pump is new, fuel lines from hpop to heads are new, oil is fresh.

I couldn't find an issue exactly the same as this, but from other things I have read it leads me to HPOP, ICP, or IPR. Is there anyway to narrow this down or anyone have this before? and where is the best place to get ICP and IPR. I don't need another HPOP, as I have another motor I can steal it off if need be.

It will be nice to finally have this thing running flawlessly, finally figured out the starting issue, with shiny new injectors lol

Also what is the best scanner for a 7.3? I'll be searching forums but any help I can get will be appreciated.
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Old 12-24-2010, 07:32 AM
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morning bump
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Old 12-25-2010, 06:48 AM
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I have the exact same prob, only when fuel tank is between 3/4 and full, I changed the pick up filter in the tank, it was bad but still didn't help, also new fuel pump and filter.
Under normal city driving conditions no problem, but when I'm on interstate or anywhere else I drive over 60 mph it slowly loses power and eventually stalls, but again only with a full tank. If you figure it out please let me know, and I will do the same
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Old 12-25-2010, 07:09 AM
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that does sound like a high pressure oil problem, auto enginuity is a good program for your laptop to scan your truck,
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Old 12-25-2010, 06:43 PM
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Same problem

99 f250 crew cab 2 wheel drive 7.3 140k
Western diesel chip/stainless exhaust.
Aux gas tank.

Light use tow road vehicle that has similar issue described in this thread.
This occurred yesterday on my Xmas eve road trip. Currently broke down in Columbus, Indiana.
Anyhoo.. Upon warm engine start up after a pitstop, the engine performance was uncharacterically sluggish. Once upon freeway I could not get speed above 45 mph. The engine exhibited rough idling when restarted , bogged down i
response to acceleration, and then eventually slowing down to stalling and currently unable to start. Normally this truck starts up like a champ!
Now the vehicle cranks fires and sputters when attempting start.
No check engine lights currently or recently . Fuel filter checked clean and found normal wear.This sputter to stall cycle progressed over 10 miles.
Presently the vehicle cranks, fires, and sputters when attempting start.
..It fires & gags but currently will not start and run.
Found a mechanic locally on xmas eve who came out with a reader.
*Codes were 1280 & 1247. Possibly stored from past events?
2 techs have said they believe the codes may not represent the current problem at hand.
CPS replaced by recall last summer tested good yesterday as well.

Fuel in tanks were from previous fills a week or so ago. I had 400 or so miles running the fuel with no problem. No fuel add/top off on trip. In addition..switching fuel tanks did not exacerbate nor relive the condition. Oil is clean and topped always.
Made calls to my A-list diesel heads.. One suggested injector wire harness failure possibility. Will follow up Monday after we troubleshoot further.
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Old 12-25-2010, 06:52 PM
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Quote:
Originally Posted by KryPTiC View Post
Hey there, I got a 1999, 551000 km's, When under hard acceleration you can feel the truck loose power, and then a clicking-tapping noise starts on the drivers side, it sounds like. Before I did my injectors (yesterday) it would start this and then completely die, injectors were screwed, with the new ones you can just let off and then go again.

About the only thing I haven't replaced on this truck is the HPOP, ICP, and IPR, most of the other sensors I have replaced, MAF, MAT, CPS etc.

Fuel filter is new, fuel pump is new, fuel lines from hpop to heads are new, oil is fresh.

I couldn't find an issue exactly the same as this, but from other things I have read it leads me to HPOP, ICP, or IPR. Is there anyway to narrow this down or anyone have this before? and where is the best place to get ICP and IPR. I don't need another HPOP, as I have another motor I can steal it off if need be.

It will be nice to finally have this thing running flawlessly, finally figured out the starting issue, with shiny new injectors lol

Also what is the best scanner for a 7.3? I'll be searching forums but any help I can get will be appreciated.
I would check the screen in the tank. Have seen several trucks with the same probs you say you are having. pulled the tanks and found stopped up screens in the pickup tubes.
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  #7  
Old 12-26-2010, 05:45 AM
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Alright, Thanks for the info guys, I have a new ICP and IPR coming, got them on ebay cheap, so I'll update this thread after I tear into this thing some more.
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Old 01-14-2011, 11:03 AM
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Well... ICP and IPR did jack ****... gonna pull tank next.

I'm really starting to hate this truck
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  #9  
Old 01-14-2011, 04:03 PM
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J. Wheeler, you are the man. That is exactly what it was, screens in the tank were completely caked with crap. Runs like a champ now.

Maybe it will keep up to my Duramax now (LOL)

anyways, thanks for the help and suggestions. This thread is doneeeeeeeeeeeeeee.
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  #10  
Old 01-16-2011, 01:37 PM
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good deal. glad you got'er fixed up and truckin again.
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