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Thread: low boost on a Powerstroke 6.0

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    USAO Staff transamz9's Avatar
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    low boost on a Powerstroke 6.0

    I have a '06 F350 CC that I drive at work and just recently had a little head warpage problem. I had the heads shaved and now I am only boosting around 22 psi at full load and WOT. Do you think this could be because the pooter is picking up on the high compression and not letting it boost as much? The truck runs fine and have no codes other than an EGR and that's because .....well there ain't one.

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    Administrator Heavy Duty's Avatar
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    no codes and only 22psi....I go down this list....

    Assuming all filters are clean and the truck is getting plenty of fuel.

    22 is normal for the earlier 03-04's but the 06 should have about 29.....

    1. Check the boost tubes for cracks...common problem with hot side straight from the turbo. look underneath with a mirror.
    2. high pressure exhaust side leaks. the y pipe is a mother to get perfectly sealed sometimes make sure the y pipe isnt cracked either that can happen too.
    3. make sure the turbo vanes are not sticking....run the living dog snot out of the motor letting off the throttle fast and back in it again...
    4. fuel pressure gauge will tell a lot too...(fuel pressure test port plug next to the return fuel line on the filter bowl) should read 58-70 idle...and nothing under 50 at WOT....If you dont have the fuel for some reason then it wont build enough boost.

    check those first....
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  3. #3
    USAO Staff transamz9's Avatar
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    I'm not understanding number 1.
    Number 2 & 3 are good and number 4 I will have to check. Filters are all good.

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    Administrator Heavy Duty's Avatar
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    the rubber tube that joins the hard aluminum tube to the turbo. looks like this....

    Its the short blue tube in the pic. a crack will be on the bottom most of the time and wont open up until 20+ psi is pushed thru it....



    ---------- Post added at 03:20 AM ---------- Previous post was at 03:15 AM ----------

    errrrrrr....I forgot to ask....

    Since you do not have an egr cooler and valve anymore....do you have tunes to eliminate the system?

    if you are running stock strategy try this....

    plug in the egr valve and just lay it on the intake not bolted to anything just zip tie it to something to keep it from rolling around. un plug both batteries. drain the non volatile memory out of the pcm turn on the headlights for 10min.

    Plug the batteries back in and start the truck let it idle for 15 min for the computer to cycle the turbo a few times (turbo learn strategy) then take for a test drive 2 repeated drive cycles going thru all 6 gears easy driving, moderate acceleration and hard acceleration. total of 6 drive cycles. shut off the truck and re-start.....that re-teaches the puter........if that doesnt do it then its not PCM related.
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  5. #5
    Senior Member IL_mad_man's Avatar
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    damn HD, why aren't you a ford mechanic?

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    USAO Staff transamz9's Avatar
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    I replaced that boot and the one on the other end too this last time I had it apart. The EGR is plugged in and laying on the intake. I will have to try the relearn. Do you think that after I put it back together, I may not have driven it correctly? The truck weighs 12-13,000 and it's hard to do easy driving. It's either moderate or hard. LOL

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    Administrator Heavy Duty's Avatar
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    Drive cycle is only for the transmission.....the idle for 15 is for the whistle...

    id say if that doesnt fix the 22 psi issue then you might have something leaking on the intake side....it may be leaking on the delete plates. Check for a clogged up MAP tube.
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    Administrator Heavy Duty's Avatar
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    Also depending which pcm flash you have this may not be avoidable without a tuner....

    Since yours is a late 6.0l removing the egr can cause problems...a low flow code (blocked off) will activate but sometimes wont throw a code.

    Question....does the turbo cycle at idle get really loud then shut down & repeat? And does the fan kick on and off....

    i think your only fix would be is to put the egr back in or get an sct tuner with custom tunes....my money is on the pcm is in a "limp" mode....
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    USAO Staff transamz9's Avatar
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    What is throwing me off is there is no noticeable power loss at all. I drive this truck all day every day so I would think I would notice some. If anything it seems to be a little peppier from say 30-70. Is there a limp mode that won't show on a computer? I have went into limp mode before for an over boost but this was way before I did anything to the truck. I do know that my MS said that he had to take a lot off the heads to get them flat again. I would say my comp ratio is way up there. I wonder what it would do, besides blow the heads off, if I was to put my Bully Dog on it?

  10. #10
    Administrator Heavy Duty's Avatar
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    the "limp" mode will not be a noticable power difference....its basically a different strategy to keep egt's in check, etc...

    but you will need to check and see if your fan is coming on or not...you will blow head gaskets again....

    sounds like the motor got hot before to warp the heads.....usually they dont warp at all....just the head bolts stretch.

    .005" taken off of the stock head height is max when machining them flat. any more is really hard on the pushrods and lifters.

    compression ratio will be the same since the combustion chamber in diesels are in the piston not in the head....

    btw....please do not put a bully dog on that truck....they belong on dodges not fords....if you decide to use a tuner go with an SCT tuner and get some custom tunes for that truck...(sct tunes the torq-shift trans also)
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