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Uhm, how do I make it go?

Discussion in '1982-Present GM Diesel' started by fbronson, Sep 21, 2004.

  1. fbronson

    fbronson 1/2 ton status

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    So my truck has developed an extremely aggrivating problem. Just the other day, I was driving home from the store, and I noticed the engine was quieter and less powerful. It got worse and worse, and by the time I made it to my house, it had virtually no throttle response, and would consistently die at stop signs. Now, it will start, and idle ok for a few seconds. If I push the gas peddle down, it will rev up once, then it immediately starts losing power until I have to keep my foot almost buried just to make it idle, then it will die. I can start it again immediately and it does the same thing. I've changed the oil and filter, both fuel filters, and the air filter. Fuel is there every time I start it, and it'll start right up even after sitting for a couple of days. Could it be the injection pump? /forums/images/graemlins/dunno.gif
     
  2. azblazor

    azblazor 1/2 ton status Premium Member

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    It could be the IP. How many miles on the truck/engine/IP?
     
  3. Pookster

    Pookster 1/2 ton status

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    Try changing the fuel filter. Sometimes, its as simple as that.
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    [ QUOTE ]
    Try changing the fuel filter. Sometimes, its as simple as that.

    [/ QUOTE ]

    [ QUOTE ]
    I've changed the oil and filter, both fuel filters, and the air filter.

    [/ QUOTE ]

    Looks like he already has...

    Rene
     
  5. Pookster

    Pookster 1/2 ton status

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    /forums/images/graemlins/doah.gif

    wasnt reading carefully enough.
     
  6. oh2dive4

    oh2dive4 Registered Member

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    Check the fuel line that goes from the big filter, under the intake, and to the transfer pump. Mine rubbed on the intake and had a tiny hole causing air to be drawn in instead of fuel. I changed out everything, just throwing parts at it until I discovered the problem. This was on my '83 3/4 ton Sub with NA 6.2. /forums/images/graemlins/doah.gif /forums/images/graemlins/burb.gif
     
  7. fbronson

    fbronson 1/2 ton status

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    [ QUOTE ]
    Check the fuel line that goes from the big filter, under the intake, and to the transfer pump

    [/ QUOTE ]
    I'll give that a look to see if that is the problem. Hopefully it'll be that simple. If not, any other ideas?
     
  8. fbronson

    fbronson 1/2 ton status

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    [ QUOTE ]
    It could be the IP. How many miles on the truck/engine/IP?

    [/ QUOTE ]
    Oh yeah, the truck has about 200K miles on it, but both the engine and the tranny (700R4) were replaced about 60K to 75K miles ago. This is the first time I've ever had problems with either. /forums/images/graemlins/dunno.gif
     
  9. dlaw36

    dlaw36 Registered Member

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    My gasser did the same thing a few weeks back. Come to find out it was my catylatic converter broke up and clogged my mufflers.
     
  10. fbronson

    fbronson 1/2 ton status

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    Well, after much head scratching and poking around, it turned out to be the little valve on the injector pump that the return line from the injectors connects to was plugged. Worst thing about it is that this part cannot be purchased, even from the dealer. They want you to buy a whole new injection pump which is like $900!! /forums/images/graemlins/angryfire.gif Anyway, I found a replacement from a junkyard for only a couple of bucks. /forums/images/graemlins/thumb.gif I've got another question though: Which wire to I unplug from the injector pump to kill the fuel so that I can do a compression test without the risk of it firing?
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The big pink wire...

    Rene
     
  12. fbronson

    fbronson 1/2 ton status

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    Cool, I'll give it a try this weekend. Even though I got my blazer running well, it still has some pretty hard starts, and blows tons of white smoke for a couple of minutes after starting, so I'm guessing the compression isn't very good. Thanks!
     
  13. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    Cool, I'll give it a try this weekend. Even though I got my blazer running well, it still has some pretty hard starts, and blows tons of white smoke for a couple of minutes after starting, so I'm guessing the compression isn't very good. Thanks!

    [/ QUOTE ]

    Or your injectors are poping at low pressure.
    /forums/images/graemlins/thumb.gif
    IceMan
     

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