GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 4 of 4

Thread: 91 wont start

  1. #1

    Default 91 wont start

    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. #2


    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. #3


    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. #4


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

Similar Threads

  1. Help! 97 wont start
    By dbltap in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 11
    Last: 01-06-2013, 10:30 AM
  2. 03 z71 wont start
    By doughhester in forum General Chevy & GM Tech Questions
    Replies: 2
    Last: 11-01-2010, 04:57 PM
  3. wont start sometimes
    By roninbrad in forum GM Powertrain
    Replies: 1
    Last: 06-25-2010, 11:48 PM
  4. Still wont start
    By Allmostsmart in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 6
    Last: 04-08-2010, 07:59 PM
  5. wont start
    By jprimrose4292 in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 12
    Last: 06-11-2009, 10:56 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts