91 wont start

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by uwireme, Aug 4, 2011.

  1. uwireme

    uwireme New Member

    1991 pickup ¾ ton 350 engine just stopped running.
    I Replaced:
    Cap & Rotor
    Then tried to start and got nothing

    So I replaced
    Ignition control module
    Then she started for 10 minutes

    So I replaced
    Fuel filter
    Air filter

    She still will only run for about 10 minutes then shuts off and won’t start again for hours.

    I can spray starter fluid in carb and get nothing.

    I do get trouble code 15 Coolant temperature sensor faulty

    What to do next?
  2. Revredneck

    Revredneck Rockstar 100 Posts

    You need to check out the code 15 first. You need to plug in a scan tool to "see" what the computer sees. A faulty coolant temp sensor will cause bad fuel problems, but usually won't keep it from starting, UNLESS it is flooding the engine. Pull your plugs and see if they are fouled with fuel (black, sooty looking). The effect is like running with a closed choke.
    Good Luck and God Bless
  3. billnorman

    billnorman Rockstar 100 Posts

    Starter fluid is not good for engines and other living things. Check your timing. You may have slipped a cog or two on the chain if it has high mileage. You need to check basics. Compression, spark, fuel, timing. You have thrown parts at the motor, now it's time for analysis.
  4. uwireme

    uwireme New Member

    She is all better now...the temp sensor was bad.
    now after replacing some original parts she runs better than ever

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