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More engine questions - intermittent dying

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Element, Apr 13, 2007.

  1. Element

    Element 1/2 ton status

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    Still trying to get some problems with the Blazer ironed out. '87 TBI 350 with about 87,000 miles on it.

    New parts - cap, rotor, plugs, wires, fuel filter, O2 sensor, air filter, alternator, and alt belt. Ran a can of Seafoam through the oil, and about half a can through the brake booster line to clean the engine out a bit.

    Problem with the truck is that it intermittently dies when idling. It'll stumble a bit, and it seems like it's idling really low (no tach, so not sure exactly what it's at) and bogging. Right after it cuts out, it'll start back up; however, there's a pretty strong gas smell. I'm not sure if it could be a problem with something like the TPS (does a TBI engine have that?), or another sensor along those lines.
     
  2. Thunder

    Thunder 3/4 ton status

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    Any trouble codes?
    Bad idle can be caused by a number of things.
    Some of the most common are.
    TPS, Coolant temp sensor. Bad IAC motor. Bad EGR, Vaccum leaks, bad throttle body base gasket.
     
  3. Element

    Element 1/2 ton status

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    Can't check the trouble codes with the paperclip method, because the dash light is out. AutoZone can't scan OBD1 vehicles, so until I buy a scanner myself, can't check the codes.

    I'm going to pull the TBI assembly off the intake this weekend and see if I can't clean it up some and check for any gunk buildup in the EGR, or on any of the sensors.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Fix the light. Your sure the light is out, and the ECM isn't just faulty?
     
  5. Element

    Element 1/2 ton status

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    A lot of the other stuff, like the high beam indicator, is also out, so I figure it's an issue with the dash circuit board or some dead light bulbs.

    Put a new coolant temp sensor in yesterday, and pulled the EGR valve out and tried to clean it out a bit, just to see if that'd help before I drop $50 on something that won't make a difference.
     

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