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Engine's smok'in - Need help!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Blazin Ed, Aug 10, 2003.

  1. Blazin Ed

    Blazin Ed Registered Member

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    Engine\'s smok\'in - Need help!

    The '88 350 is stock, it idles just fine but as soon as you put it in gear it loads up and starts blowing black smoke out the exhaust. We've changed plugs, wires, cap, rotor, and O2 sensor. Someone suggested it might be a faulty EGR valve, what do you guys think? When it idles it's very smooth otherwise. Is it worth paying $50 bucks to get it analyzed?
     
  2. SUBFAN

    SUBFAN 1/2 ton status

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    Re: Engine\'s smok\'in - Need help!

    Black smoke is fuel, check that stuff, that's all I can say....
     
  3. Blazin Ed

    Blazin Ed Registered Member

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    Re: Engine\'s smok\'in - Need help!

    Fresh fuel and injector cleaner...
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Re: Engine\'s smok\'in - Need help!

    It's not worth anything to get it scanned. You can do it for free yourself, and if you don't want to, Autozone will do it for you for free.

    I don't know nearly enough about TBI to know why it'd pour fuel in your engine like that. A dripping/leaky/improper spray pattern injector would do something just like that I bet though.

    Is your Service Engine Soon light on?
     
  5. Blazin Ed

    Blazin Ed Registered Member

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    Re: Engine\'s smok\'in - Need help!

    No check engine light... The injectors give out a misty spray pattern, one of them a real slight drip but not enough to make me worried.
     
  6. HarryH3

    HarryH3 1 ton status Author

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    Re: Engine\'s smok\'in - Need help!

    [ QUOTE ]
    one of them a real slight drip but not enough to make me worried.

    [/ QUOTE ]
    It should... You should never see any drips from a good injector. /forums/images/graemlins/eek.gif It sounds like the pintle in the injector is jammed against something and not closing properly. A good cleaning may fix it.
     
  7. 87BrnRsd

    87BrnRsd 1/2 ton status

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    Re: Engine\'s smok\'in - Need help!

    If you do get a check engine light, you can check the code for yourself and you dont need a scanner. All you do is turn the truck off, fold a paper clip in half, and stick both ends into the top 2 holes on the right side of the computer port. The port is under your dash to the left of your steering wheel. Once you get the paper clip in there, turn the ignition on but dont start the truck. Read the number of times the check engine light flashes. It will flash once, pause, then flash 2 more times, and it will do this three times (this is code 12 for diagnostic mode). This means its in diagnostic mode. After it does that 3 times, wait for a longer pause, then it will flash again (for example, 4, pause, 3) would be a code 43. It will do this three times, and if there is another code it will do that one too. If not, it will flash the code 12 again. Then, once you get the code, post it up here and we can interpret it for you. But one thing, just because the code says bad map sensor or something like that, it doesnt necessarily mean that part is bad, another faulty part can sometimes trigger another code. But this doesnt happen that much. If you need any help with reading the code, just ask.
    -Harrison
     

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