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Thread: Won't start

  1. #1
    Join Date
    Apr 2005
    Location
    california
    Posts
    14

    Default Won't start

    I have a 1996 3/4 ton 2 wheel drive 6.5 turbo. I have 205,000 miles and replaced my FSD about 6,000 miles ago. The truck won't start. I replaced my lift pump, fuel filter and have swapped in / out various FSD's and the truck still won't start. My glow plugs are working. It seems like the truck initially gets fuel when I activate the starter because it fires up for about a second then dies. My batteries and connections seem to be OK as well.

    Any suggestions out there? Bad electrical connections? Or dead ECM?

  2. #2
    Join Date
    Apr 2001
    Location
    Harveyville, KS, USA
    Posts
    76

    Default

    Do you hear the lift pump working? If not, OPS might be your culprit.
    '94 2500 Ext Cab, 5 speed, 4X4, flood recovery project.

  3. #3
    Join Date
    Dec 2003
    Location
    SC
    Posts
    939

    Default

    Verify fuel is being pumped by LP. Then check if fuel is coming out of IP: loosen a fuel line at injector and see if it weeps fuel after cranking it for a while. If no fuel feel for the fuel shut off solenoid operation.

    Any codes? You said batteries are clean and connections look good make sure they are; side posts can be decieving especially passanger pos post take it apart and clean. Check the grounds and other end of battery cables. Also all fuses.

    Other thing you could do is plug in block heater to make sure its warm enough to start too. Batteries should turn over pretty quick too. Recharge them if possible.
    97 5spd K2500 Ext Cab short Bed ~160K miles.
    TM, 3" downpipe & 4" exhaust, remote FSD, remote oilfilter, Gauges: EGT, Boost, Fuel Pressure, B&W Gooseneck Turnover ball, Prodigy Brake Controller. Hi-Temp Hydraulic Oil Cooler Lines.

  4. #4
    Join Date
    Apr 2005
    Location
    california
    Posts
    14

    Default Now it will start but it has before

    I used engine degreaser and rinsed the engine with water. There was some diesel in the engine compartment from injector inpection. Now my truck started right up and runs like a champ. It did this a few weeks ago as well then died on me again. The majority of the wiring and many connections are routed directly behind the fuel filter. Is it possible that diesel / grime is interfering with some electrical connections?

  5. #5
    Join Date
    Oct 2003
    Location
    Huntington In
    Posts
    1,367

    Lightbulb

    On your first post,Eng would not start. Had you just washed the Eng?
    95C3500.Ext.Cab 97 Cooling mods. DSG Gear-1.95 TDCO. Bilstein Shocks. Firestone Air Bags. FSD Cooler. Banks EX System. Egt,Boost & IAT Gauges. JK High Flow/pop Injectors. Turbo-Master. Max-E 2.0. Water/Alky Injection. Amsoil Dual Bypass. Baldwin filter. aFe Air filter, Air box & Turbo Mods. Power Service Product. Large Duels 235/85-16. Tool Box\'s & truck, 8200 lbs.

  6. #6
    Join Date
    Dec 2003
    Location
    SC
    Posts
    939

    Default

    Unfortunetly, electrical connections are always an area to investigate but hard to pinpoint unless you can make problem come and go. FYI: I think GM later said when replacing IP they also replaced a section of wiring harness that goes to FSD. Communication between the FSD and ECM must be good and ECM must like what the FSD is doing or ECM cuts off fuel at shut off solenoid. Your test FSD's may not have ever communicated with ECM????

    Explain the washing part again and occurances of the no starts.

    How did it crank up. Were you testing fuel out of IP (loose fuel line at injector) and it started up with no apparent real fix? Then seems A OK? If no codes that does sound like a bad communication or other electrical gremlin not sensed by OBD.
    97 5spd K2500 Ext Cab short Bed ~160K miles.
    TM, 3" downpipe & 4" exhaust, remote FSD, remote oilfilter, Gauges: EGT, Boost, Fuel Pressure, B&W Gooseneck Turnover ball, Prodigy Brake Controller. Hi-Temp Hydraulic Oil Cooler Lines.

  7. #7
    Join Date
    Dec 2003
    Location
    cleveland, oh
    Posts
    61

    Lightbulb Lift pump test...

    I read about this earlier on this site, if your truck is an automatic, you can put the truck in drive, then turn the key to the start/crank position, if your lift pump runs when you do this OPS is working, the ops turns on lift pump when cranking and running(with oil pressure...) if you don't here lift pump, check power to it...you can also do this after changing fuel filter, crack the drain valve and use the lift pump to purge the air/fill the fuel filter cannister...

  8. #8
    Join Date
    Apr 2005
    Location
    california
    Posts
    14

    Default

    Thanks everyone for your help. I ordered a new FSD and cooling kit from SS Diesel. I installed it today and so far everything seems to be OK. My current FSD only had about 7K on it so it was hard for me to believe that could be the problem. Meanwhile I'll be saving my pennies for a truck without a 6.5. This truck would be great if I didn't have to rely on it to actually run.

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