Limp Mode? 08 F-450 6.4 - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 04-07-2014, 08:00 AM Thread Starter
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Limp Mode? 08 F-450 6.4

This is driving me nuts!

Randomly happens and can't figure it out.

I will be driving at 40-60MPH and my truck will randomly go in to "Limp mode"??? Restricts RPM's to 1,750... If I do a quick key cycle while still driving it runs great for 15-20 seconds or it may not do it for an hour.......

My truck is bone stock, 08 F-450 crew cab 4x4 Dually getting 2 codes, will get actual numbers asap...

EGR Performance code "I have unplugged egr wire"
also DPF sensor circuit high voltage I think....

Have replaced DPF sensor, tried leaving it unplugged.... neither works...

I have ordered an EGR Delete kit/ Cat Delete/ DPF Delete.....

I am looking into tuners but don't need 1,000,000 horsepower, just want one to delete the cat/ dpf/ egr and not throw codes, but add a little extra performance...

Am I on the right track here or should I dig deeper?

2008 6.4 TT F-450 Crew Cab 4x4 Dually
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post #2 of 11 Old 04-07-2014, 08:01 AM Thread Starter
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Forgot to mention I have also replaced fuel filters just to be safe

2008 6.4 TT F-450 Crew Cab 4x4 Dually
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post #3 of 11 Old 04-09-2014, 06:45 AM
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If I had to make a guess...I'd guess a faulty or sticking EGR valve, but without exact codes it's hard to know for sure.
Without a tuner to disable the egr or dpf sensors, unplugging any of these sensors will result in a code for sure. Is this EGR sensor unplugged on your truck, or did you just unplug it to trouble shoot? If this sensor is unplugged.....that's the reason for the EGR code.
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post #4 of 11 Old 04-09-2014, 06:50 AM Thread Starter
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I unplugged the EGR just to do some testing tried resetting the code and driving with it unplugged still had the same issue I plugged it back in and reset codes EGR immediately set off a code for performance so I'm looking into purchasing a programmer now to delete it

I'm guessing the EGR is either stuck wide-open or stuck closed because when you plug it in it doesn't make a single sound it's motor is obviously not doing anything. I tried tapping it with a hammer and I still have no movement of the EGR

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post #5 of 11 Old 04-09-2014, 06:51 AM Thread Starter
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I'm just hoping that the EGR itself throwing a code can cause the truck to put itself in limp because if that's all it is I will be happy I'm looking into a Spartan teaner right now I think that'll be a good option

2008 6.4 TT F-450 Crew Cab 4x4 Dually
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post #6 of 11 Old 04-09-2014, 07:04 AM
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Don't quote me on this but I'm pretty sure a faulty EGR will cause limp mode. I assume you're also looking into deleting the DPF with whatever tuner you get?
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post #7 of 11 Old 04-09-2014, 09:50 AM Thread Starter
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Quote:
Originally Posted by tofer View Post
Don't quote me on this but I'm pretty sure a faulty EGR will cause limp mode. I assume you're also looking into deleting the DPF with whatever tuner you get?
Yes Sir! I have the EGR delete, arrived today, and the CAT delete/ DPF Delete is on the way. Just looking for a tuner now!

2008 6.4 TT F-450 Crew Cab 4x4 Dually
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post #8 of 11 Old 04-09-2014, 10:49 AM
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I run the H&S tuner myself....liked the h&s tunes...never was truly happy with the trans tuning personally though. I've been running Gearheads engine and trans tunes through my H&S tuner now since last Sept....Absolutely love his engine & trans tunes. Smooth power, very low smoke, decent mileage, and trans shifting is load based. Not sure if you've thought about running custom tunes or not, not even sure if Spartan has that option as I've never used that tuner, but something to keep in mind.
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post #9 of 11 Old 04-09-2014, 11:28 AM Thread Starter
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Just purchased a Spartan phalanx... Lets hope I like it LOL

2008 6.4 TT F-450 Crew Cab 4x4 Dually
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post #10 of 11 Old 04-09-2014, 12:37 PM
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You'll definitely like the driveability of the truck more with the dpf delete. Noticeable even on stock power settings on the tuner. Your truck will like being able to breathe.
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