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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

"limp" mode

 
  #1  
Old 10-26-2010, 11:20 PM
Texas450
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Exclamation "limp" mode

i decided to make a new thread about my problem instead of taking over the other one


1 month ago my truck went in to limp mode.... meaning the truck would not rev. over 2500 rpms

i turned the key off and on and the truck was back to normal.

1 week ago the same thing happened and i did same thing and every thing was back to normal

sunday the truck goes in to limp mode but this time i have a check engine light come on with a code of fuel rail pressure is too high


monday i take my truck to a diesel shop that i trust and they pulled the code and clear it....then they took it for a test drive and could not get the truck to repeat the problem (no limp mode, no engine light)
but the check air filter light came on for the first time ever... mechanic said that maybe the engine was starving for air and the fuel/air combo was off making the pressure to high....or the computer messed up and threw a false code
but untill it threw the same code they said to take the truck back

today everything was working fine. I was doing some local runs around houston. then about 3pm my truck goes limp again but this time i notice that the transmission temp gauge is reading cold...which make no sense...since the trucks been working all day and it was only shut down for about 15 mins before this happened

so i turned the truck off and back on and the temp gauge climbed back up to normal operation temp....i had no problem

then i made my delivery and shut the truck down again for about 40 mins fire it up and truck goes limp and noticed the trans gauge is on cold again....turned key off and on works great.


would the truck go limp if the trans temp gauge is to cold?

anyone have any advice?
 
  #2  
Old 10-27-2010, 05:12 AM
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wiring somewhere shorting? That is what I am thinking...Have also had your batteries checked? Those batteries do some wierd stuff when they are weak.

Don't think that is your issue but someplace like napa or autozone can test them for free.
 
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Old 10-27-2010, 07:15 AM
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what tune do you have loaded? is there a stock, just DPF off tune?

As Scott mentions I would also look for a loose wire.. you did touch the sensors when you did the doc/dpf delete.

Sam
 
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Old 10-27-2010, 03:33 PM
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Maybe check the electrical harnesses/plugs too. If that truck ever had the cab off maybe one of them never got put back on tight enough and you now have an intermittent connection??
 
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Old 10-28-2010, 04:24 PM
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Originally Posted by sdetweil View Post
what tune do you have loaded? is there a stock, just DPF off tune?

As Scott mentions I would also look for a loose wire.. you did touch the sensors when you did the doc/dpf delete.

Sam
I think you nailed the problem...hopefully! I changed the tune to stock w no dpf and seems to be running good...now we will have to check fuel eco!
 
  #6  
Old 10-28-2010, 08:03 PM
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I had my HPFP replaced at 117k miles, my truck threw a code and you could say went into limp mode. It acted like there was a transmission issue....but it turned out to be the HPFP, The cab had been off several times and I have never that elect / connection issues...good luck resolving you problem...keep us posted
 
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Old 10-28-2010, 09:46 PM
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Originally Posted by Smoke2008 View Post
I had my HPFP replaced at 117k miles, my truck threw a code and you could say went into limp mode. It acted like there was a transmission issue....but it turned out to be the HPFP, The cab had been off several times and I have never that elect / connection issues...good luck resolving you problem...keep us posted

how much did that run you if you dont mind me asking....
 
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Old 10-29-2010, 03:13 PM
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gone 2 days now with no proplems since changing the tuning.....still crossing my fingers.....

tex
 
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Old 10-29-2010, 04:51 PM
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The repairs to my truck cost nothing, I have the 21 major engine componets / 200k mile warranty....I purchased that just before the truck reached 36K miles.....The repair would have cost....4200.00 ....the dealer billed for a little less than 3200.00 ....warranty repair.
 
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Old 10-30-2010, 04:39 PM
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3 days now and no issues....if I make it to 14 I will feel a lot better
 
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Old 11-11-2010, 02:30 PM
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well i would like to let everyone know that i got my truck back from the shop.....they replaced the HPFP.....and the truck seems to be running awesome!!! thanks for everyones help on this issue.....they said that the pump was not functioning correctly and this is what caused the truck to throw the code....

tex
 
  #12  
Old 11-11-2010, 03:02 PM
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Originally Posted by Texas450 View Post
well i would like to let everyone know that i got my truck back from the shop.....they replaced the HPFP.....and the truck seems to be running awesome!!! thanks for everyones help on this issue.....they said that the pump was not functioning correctly and this is what caused the truck to throw the code....

tex
Well Tex you don't have to answer but I have to ask: did they give you any crap about the DPF and the tuner?
 
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Old 11-11-2010, 03:12 PM
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Originally Posted by StanleyZ View Post
Well Tex you don't have to answer but I have to ask: did they give you any crap about the DPF and the tuner?

hey stanley.... not really sure what your talking about?
 
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Old 11-11-2010, 05:01 PM
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Hmmm look down, see DPF, do repair. I like!
 
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Old 11-11-2010, 07:04 PM
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Originally Posted by Texas450 View Post
hey stanley.... not really sure what your talking about?
10-4 backdoor
 
 
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