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Detroit 12.7 DDEC 4 Interesting problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by eagle005, Feb 10, 2015.

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  1. Feb 11, 2015 #11
    eagle005

    eagle005 Bobtail Member

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    Feb 10, 2015
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    @smellfunny. Blown intake gasket? I don't really think so. Reason being is that with my doing the ECM work moved the boost psi up 10 psi. It's still acting the same, just doing it at a higher boost psi. Very hard to explain.
     
    Last edited: Feb 11, 2015
    eagle005, Feb 11, 2015
    eagle005, Feb 11, 2015
    #11
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  3. Feb 11, 2015 #12
    Smellfunny

    Smellfunny Road Train Member

    1,395
    936
    Jan 28, 2012
    South Carolina
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    Just throwing things out there that could cause loss of pressure. The last head I took off a Detroit the guy's intake gasket was blown in half on the back set.
     
    Smellfunny, Feb 11, 2015
    Smellfunny, Feb 11, 2015
    #12
    Oldironfan Thanks this.
  4. Feb 12, 2015 #13
    savage02

    savage02 Light Load Member

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    Dec 21, 2007
    Upstate, NY
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    If the borg warner larger than the garret you replaced it with it maybe causing some lag? Also I was under the impression that the series 60 in near stock form would perform better with a wastegated turbo seeing as it should spool up quicker. I think the non-wastegated turbo is more beneficial after some added mods like a ported manifold and a hotter ecm tune where the engine would be pushing more air through it. Maybe call out Cowpie for some advice on this I believe he has a pretty hot setup on his series 60.
     
    savage02, Feb 12, 2015
    savage02, Feb 12, 2015
    #13
  5. Feb 14, 2015 #14
    truckerbangin

    truckerbangin Light Load Member

    256
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    Jan 22, 2013
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    yeah it would show all codes as normal. i used the ddec iv trouble shooting guide and it would allways refer to change ecm or the sensors that i had just changed even witt the dddl everything check out normal after changing ecms ,new and known working sensors truck would still be iffy.
     
    truckerbangin, Feb 14, 2015
    truckerbangin, Feb 14, 2015
    #14
  7. Feb 14, 2015 #15
    eagle005

    eagle005 Bobtail Member

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    Feb 10, 2015
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    This is a little premature to post probably, but I just ran an overhead on my truck. Valves are all fine. But the injector height was off almost 3mm on all injectors. I reset them all to 81 mm like the specs call for. Just wondering if anyone knows how the injector height being that far off would affect the motor.? Will start and run it. A little later and update.
     
    eagle005, Feb 14, 2015
    eagle005, Feb 14, 2015
    #15
  8. Feb 17, 2015 #16
    fortycalglock

    fortycalglock Road Train Member

    6,120
    6,513
    Jun 25, 2011
    Tourist Town, FL
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    You've changed air and fuel filters right? One of the first signs my fuel filters need changing is not getting full boost. I have a 99 DDEC4 430/470 engine. I get 32+ boost on my gauge.
     
    fortycalglock, Feb 17, 2015
    fortycalglock, Feb 17, 2015
    #16
  9. Feb 19, 2015 #17
    eagle005

    eagle005 Bobtail Member

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    Feb 10, 2015
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    Ok guys, got the old girl back on the road. Pulls good. Real good. But still only ever see 28 psi of boost. Crazy. Yes, I changed all the fuel filters. Air filters. With the tune I have in the ECM, I ought to be hitting 40 psi without any problem. I don't really want the boost to go that high, but I set the tune that high to see if it would change the boost pressure. Somebody mentioned the intake gasket. I guess I'll check that yet. Is there a way to check that without just removing the intake manifold?
     
    eagle005, Feb 19, 2015
    eagle005, Feb 19, 2015
    #17
  10. Feb 19, 2015 #18
    cat from the valley

    cat from the valley Medium Load Member

    469
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    Dec 8, 2008
    jamaica
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    40psi of boost on a Detroit? How much rpm are u getting
     
    cat from the valley, Feb 19, 2015
    cat from the valley, Feb 19, 2015
    #18
  11. Feb 19, 2015 #19
    Chip S

    Chip S Light Load Member

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    May 27, 2013
    Texas
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    How about the hose going from the intake manifold to air compressor?
     
    Chip S, Feb 19, 2015
    Chip S, Feb 19, 2015
    #19
  12. Feb 19, 2015 #20
    wore out

    wore out Numbered Classic

    14,335
    173,879
    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
    0
    If it's a boost leak you should hear it. It could be an intake gasket or compressor hose but again you should hear it. The way I check them is pull the air filter wrap it up in heavy plastic to seal off the open end and put it back in. Put 8 to 10 pounds of pressure in the intake at the 1/4 in pipe plug. Then spray everything from intake to air filter. This way it checks to see if your sucking unclean air while checking the entire intake system for pressure leaks not just the air to air cooler.

    Just shooting from the hip I would say check the baro/atmospheric pressure harness and sensor. I have seen no codes and still cause the just not fueling feeling. Also check the cam timing. That will effect boost and power. It does usually cause high EGT temps though.
     
    wore out, Feb 19, 2015
    wore out, Feb 19, 2015
    #20
    BoxCarKidd Thanks this.
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