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350 TBI Problem...Please help!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MudFrog, Apr 7, 2001.

  1. MudFrog

    MudFrog 1/2 ton status

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    ok.. I have an 89 with 350 TBI. This problem started about a month or two ago and is only getting worse. Sometimes when I start the engine it will immeaditely stall. But then it will fire right up. Well today it was unusually warm, it got up to 85 degrees here in Va. A couple times through out the day it would stall then when I try to start it again it would not start till I actually pressed down on the gas. I changed the spark plugs about 4 months ago, and I use fuel injection cleaner about once a month.
    Anybody have any idea's of where I can start troubleshooting?

    89 K5 Silverado
    <A target="_blank" HREF=http://mudfrog.coloradok5.com>http://mudfrog.coloradok5.com</A>
     
  2. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    I'd check the fuel pressure, my 87 use to have TBI and if yours is the same set up, there is a fuel pump relay on the back firewall. If the relay is failing the fuel pump gets it power for an oil sending unit on the drives side back of the motor.
    Any of these could cause your fuel pump to cut out or the fuel pump is on it's way out. I had to replace mine a couple of years ago. If you can hook up a gauge and watch the fuel pressure you might catch it. My fuel pump puts out about 45 psi so get the right gauge to handle yours. Good luck!
    ps - there are many other things that could cause this, this is only one......

    [​IMG]
     
  3. MudFrog

    MudFrog 1/2 ton status

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    The only time it does this though is when I first start it. It runs fine after it has been started. I'll see what I can do about checking it though. Thanks.
    Any other ideas for me to try?

    89 K5 Silverado
    <A target="_blank" HREF=http://mudfrog.coloradok5.com>http://mudfrog.coloradok5.com</A>
     
  4. 4x4k20

    4x4k20 1/2 ton status

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    i have a 95 350 that does the same thing i havent figured it out yet i replaced the module in the dist ithought it would help but it didnt but that could be your problem i had 89 that was doing this it fixed it

    4x4k20
     
  5. Steve_87K5

    Steve_87K5 1/2 ton status

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    My '87 has TBI.
    I have had problems that sound like yours.
    My problems have been:
    1. plugged fuel filter.
    2. fuel pump internal plastic part failed (white
    plastic coupler to motor shaft got rounded off). It still worked but had intermittent
    delivery. Installed frame mounted Mallory pump model 4060FI.

    Not related to your symptoms, but I have also replaced coolant temp sensor (it was
    running very rich) and rebuilt fuel the pressure reg, just because it had passed 250k miles.
    Also replaced injectors recently because they were leaky. Easy job. Used reman inj
    from Northern Auto.


    SteveB
     
  6. 90K5

    90K5 1/2 ton status

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    Mine was doing that and an ignition module cured it.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  7. CV202

    CV202 1/2 ton status

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    Start w/ the basics and work your way up. Check the cap and rotor, wires,and coil. Replace your fuel filter (unless you just did it, it's a good idea anyways) and the gappin on your plugs. Sometimes the gap will alter over time from poor conditions, detontion, etc. Also, are you running quality fuel??

    Why do people keep calling it a Bronco!!!!!
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    NOt TBI, but my carbureted car would die EVERY time it was started when cold, because of a vacuum leak. TBI adds a bunch more variables in than a carb, but its a thought..

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  9. MudFrog

    MudFrog 1/2 ton status

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    I'm running 89 octane...I'll start with the fuel filter since so many has mentioned it.


    89 K5 Silverado
    <A target="_blank" HREF=http://mudfrog.coloradok5.com>http://mudfrog.coloradok5.com</A>
     

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