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96 Detroit S60 idle problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Greasehauler, Jun 26, 2011.

  1. Jun 26, 2011 #1
    Greasehauler

    Greasehauler Light Load Member

    56
    18
    Sep 27, 2008
    Minnetonka, MN
    0
    I have a '96 T600 with Detroit S60 12.7l engine. The truck seems to run fine under load, although somewhat low power. When idling, however, it sounds like it's missing on one cylinder.

    I have straight pipes on it, no mufflers. I put a permanent gauge on the fuel pump and fuel pressure is a steady 60 psi. I've had the truck in several shops and after $400-$500 for each diagnosis, they come up with "bad injector". The problem is, it's always a different bad injector. Sometimes #3, sometimes #5 etc. I've had injectors replaced about 200K ago.

    Did I have to retune the engine in any way after installing straight pipes? Any ideas would be appreciated.
     
    Greasehauler, Jun 26, 2011
    Greasehauler, Jun 26, 2011
    #1
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  3. Jun 26, 2011 #2
    112racing

    112racing Road Train Member

    1,384
    20,547
    Nov 30, 2008
    pocono's, pa
    0
    maybe bad injector ...... check codes......replace and fill the filters with lucas and double up in the fuel and run it for a couple of tanks
     
    112racing, Jun 26, 2011
    112racing, Jun 26, 2011
    #2
  4. Jun 27, 2011 #3
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,640
    Oct 11, 2010
    Borispol, Ukraine
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    Start with fuel pressure

    After that do Cyl. Cut out test with DDDL at idle and at 1000 rpm. You will see the bad injector. Detroit diesel allows to change one injector only, but I recomend you to change all with rebuilt injectors. Becouse a year later ore less you will get other injector bad and later you'll change all one by one
     
    Pablo-UA, Jun 27, 2011
    Pablo-UA, Jun 27, 2011
    #3
  5. Feb 19, 2012 #4
    jab8283

    jab8283 Bobtail Member

    38
    16
    Jan 16, 2010
    Indiana, U.S.
    0
    Just my two cents worth guys but this did happen to me and costed me a lot of money. On a former repair the technician buttoned up the top of my DDEC 4 12.7L Series 60 and pinched the injector harness. It took time and vibration but it eventually broke the insulation and grounded to block and blew two injectors. Before all this the techs kept saying I had bad injectors but all along it was a pinched harness to the injectors that caused my problems. Got new injectors and harness and never had the problem again from that issue.
     
    jab8283, Feb 19, 2012
    jab8283, Feb 19, 2012
    #4
  7. Feb 20, 2012 #5
    Heavyd

    Heavyd Road Train Member

    7,625
    6,027
    Feb 4, 2009
    0
    We have seen high fuel pressure and or high fuel temp cause symptoms like this. The pressure should be 12-15 psi at idle, 30-45 at around 1300 and 60-70 at 1800/2100. The fuel pressure is created by a restrictor fitting at the outlet of the head. The hole is only about 0.080" big. We have seen where a small piece of debris gets stuck. This causes two problems, increased the pressure and slows down the flow. With slower fuel flow the fuel can over heat in the head and you loose power.
     
    Heavyd, Feb 20, 2012
    Heavyd, Feb 20, 2012
    #5
    RubyEagle and Jimmbuds Thank this.
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