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350 TBI needs your help.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Bowtied, Jun 15, 2001.

  1. Bowtied

    Bowtied Registered Member

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    Hello againn all,
    I need your help in trying to figure out what is causing my 87 to run so poorly. As i said, it's an 87 350 TBI. It intermittently dies when sitting at a stop while tranny(TH350) is in drive. It will run fine until I stop and then the RPM's slowly fall until around 600-500 and then it dies.
    So far I've replaced:
    Plugs, Wires, Air Filter, Fuel Filter
    EGR Valve, EGR Control Solenoid, Idle Air Control, and the Oxygen sensor.
    It runs great when it's in higher throttle conditions. It just does'nt want to idle sometimes, actually most times, it will idle in gear every now and then, mostly for the first few minutes of driving.
    I know it could be a million things but if anyone can help I would greatly appreciate it!!!
    Thanks,
    Bowtied
     
  2. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Check/replace all vacuum lines.
    Check/replace cap and rotor.

    Does it smoke (color?) when you restart?

    Dave

    "Visualize Whirled Peas"
     
  3. Bowtied

    Bowtied Registered Member

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    Thanks for the reply.
    I did check for vacuum leaks, but have'nt yet messed with the cap and rotor (at least not that I can remember, did the tune up stuff last Nov.).
    And, no smoke on start up.
     
  4. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Last Novemebr? You are probably due for a fuel filter again.
    Although mine loses power on the high-end when the fuel filter is plugged....

    Dave

    Don't Be Sexist - Broads Hate That
     
  5. FWP

    FWP CRS

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    TH350 C???? Maybe electric lockup is locking up in idle??? I dunno, just a thought. What happens when you put it in Neutral? Same thing or heals up?

    <A target="_blank" HREF=http://fwp4x4.rockcrawler.com>http://fwp4x4.rockcrawler.com</A>
     
  6. River

    River 1/2 ton status

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    Look if the coolant temperture sensor is ok. It could be the problem when it`s faulty.

    good luck.

    Greetings from Amstelveen,

    River `90 K5, 350, TH700R4, NP241, "32, 3.08, 10 bolt F, 10 Bolt R(GOV-Lock)
     
  7. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color=blue>The TPS may need adjusting also</font color=blue>

    [image]http://bbs.off-road.com/wwwthreads_uploads/53-288682-mudpit3.jpg[/image]
     
  8. Bowtied

    Bowtied Registered Member

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    Thanks for the reply.
    I had a friend suggest that also. Would this explain why it sometimes runs better when not quite up to operating temp?
    Thanks Again,
    Bowtied
     
  9. Bowtied

    Bowtied Registered Member

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    biggray,
    How do you adjust it. Mine mounts on the opposite side of the throttle linkage to the throttle body and I think I can only remember two mount holes. Give me a heads up on the adjustment. I'm no stranger to a multi-meter if that helps.
    Thank you,
    Bowtied
     

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