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HELP! my truck slipped into an EFI related coma

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BillyBob, Jul 10, 2000.

  1. BillyBob

    BillyBob 1/2 ton status

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    I was driving down a heavily populated street today.. all of a sudden, as I was trying to accelerate, nothing happened.. I was going about 20, pushing the pedal down farther and farther.. finally, the thing jolted, slowed, jolted again.. I went about 2 blocks, then the thing totally shut down... I tried starting it.. It was trying to ignite, but it apparently wasn't getting any fuel.. now, I dunno much about it's mechanical history, but my guess is that the injectors never got cleaned (87K5 w/TBI). I doubt it's my fuel pump. Maybe there's a clog? I have been burning a little oil due to leaky valve seals... but it hasn't been anything bad. Well, anyway, I had to get it flatbedded home >_<. At least the guy was cool, and since I was in the 3 mile range limit, it was free of charge. Though, I have to admit, seeing my truck that high kinda makes me wish I had a 12" lift :) In any case, anyone have advice as to what it may be? BTW- I took some pics of it on the flatbed.. hope they come out! Remind me to become a tow truck driver! They rule!

    P.S. Never EVER break down without inspection in NJ.. I luckally smooth talked a cop into leaving.. if he saw I didn't have a sticker I woulda been screwed! I guess someone was looking after me today... Must be the Chevy 4x4 god.

    http://billybob.coloradok5.com
    It's all fun 'n games, till someone gets stuck.
     
  2. rocko

    rocko 1/2 ton status

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    Hope it's not a computer problem.. or maybe it was only vapor lock.

    make K5 up yours !!!
     
  3. BillyBob

    BillyBob 1/2 ton status

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  4. rocko

    rocko 1/2 ton status

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    vapor lock is caused by extreme heat. Kinda like having air in the lines that needs to be "pushed out" somehow. I've only experienced it a few times here in Texas since it gets so freaking hot here..

    make K5 up yours !!!
     
  5. rocko

    rocko 1/2 ton status

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    a better description

    vapor lock problem: the pump is mounted in the engine bay which can get pretty hot. And it and it's suction lines can get warm enough to boil the gasoline in the lines. The pump is designed to pump liquid fuel, not vapor, and so no fuel is delivered to the engine causing sputtering.

    make K5 up yours !!!
     
  6. BillyBob

    BillyBob 1/2 ton status

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    Re: a better description

    Well, I've let the truck cool for an hour or so now.. still won't ignite.. I'm getting it sent somewhere soon to get it fixed.. hopefully.

    http://billybob.coloradok5.com
    It's all fun 'n games, till someone gets stuck.
     
  7. MICHIGAN BLAZER

    MICHIGAN BLAZER 1/2 ton status

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    Turn your key on, but don't start your truck. If your fuel pump is working you should be able to hear a buzzing from the gas tank as it pressurizes it. If you don't hear a buzzing check all your wires that run to the pump. Another cheap way out may be a clogged fuel filter

    <font color=red>MICHIGAN BLAZER
    <font color=green>89 Fullsize Blazer
    87 Cherokee
    65 IH Scout
     
  8. DMK

    DMK 1/2 ton status

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    It is more than likely your fuel pump. Though could be your fuel filter.
     
  9. 87Blzr

    87Blzr 1/2 ton status

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    Michigan Blazer is right. Turn the key on and you should hear the fuel pump come on for about two seconds. Fuel pump is in the gas tank on TBI. Make sure your getting spark also. My truck recently did the same thing less than a mile from my house. Unfortunatley tow truck people are not as nice around here. $60 for 15 minutes and under a mile on the same street. Anyway it stumbled for a few then died. Then it acted like it wanted to start, but didn't. It was the ignition module.

    87 K5 Siverado, 68 SS 396 Camaro
     
  10. MuleMaster

    MuleMaster 1/2 ton status

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    I'd check the fuel filter first. Would be the most inexpensive part!
    L8er
    MuleMaster

    <font color=blue>K5 Blazer...because size DOES matter
    http://projectmule.coloradok5.com</font color=blue>
     
  11. BillyBob

    BillyBob 1/2 ton status

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    I found out what happened to my truck. Apparently, the clip which contains wires which supplied power to the fuel pump and gave fuel gauge reading, broke. The one for the guage was still plugged in, however, the one that powered the fuel pump came loose. Someone before me apparently knew about this, because there is tons of electrical tape around it. I did the same, and taped it up for now.. anyone know where I can find a new clip? The truck is running fine.. though at first, it sounded weird.. probably the fuel going through the lines. Anyone know a part# or can reccomend a replacement, please let me know!

    http://billybob.coloradok5.com
    It's all fun 'n games, till someone gets stuck.
     
  12. rem7600

    rem7600 1/2 ton status

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    My Boss recently had something similar happen
    to his rig. and I've heard of 2 others that
    have experienced the same problem that he had...
    It turned out to be a "PLUGGED" Cat Converter!
    It wasn't exactly the scenario you describe but
    is not far from it... Just a thought.

    [​IMG]
    <font color=purple>REM7600 - '89 Jimmy</font color=purple>
     
  13. MICHIGAN BLAZER

    MICHIGAN BLAZER 1/2 ton status

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    Same thing happened to mine, just before the clip though. The wire had been cut and a butt connector was put on....well the copper wire rotted and thus no juice. spliced her back together and taped the crap out of it.

    <font color=red>MICHIGAN BLAZER
    <font color=green>89 Fullsize Blazer
    87 Cherokee
    65 IH Scout
     
  14. Mint90

    Mint90 Registered Member

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    Tape ? Damn all you wannabe Electricians ! Tape is for trails to get you home. Solder and shrink tube is permanent.

    Mint '90 K5, All Stock, All Options, 49K
     
  15. CrazeeBush

    CrazeeBush 1/2 ton status

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