1997 GMC Sierra truck will not start

Discussion in 'GMC Truck Forum' started by r3nem1, Dec 3, 2012.

  1. r3nem1

    r3nem1 New Member

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    Have a 1997 GMC Sierra truck that will not start. It was working fine Friday. Then tried to crank this morning and it will not start. It does crank and that is it. We had the battery tested and it tested fine. I can hear the fuel pump turn on before we try to start it. Checked the fuses. Need some advice on what to check.
     
  2. leolkfrm

    leolkfrm Full Member

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    check for spark,...
     
  3. chevychase

    chevychase Semi-Admin
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    Is service engine light on? If so need to scan for a code. First thing see what is lacking fuel or spark. Check for spark at the plugs..then at the dist.
    If you find you have spark need to see if truck will start with a prime. Pour some fuel in the throttle body..see if it tries to start.
    Could be so many things cause a no start. If it starts with a prime..then quits need to do a fuel pressure check. Here is a pic where to check fuel pressure to the far right at the black cap can not see it in pick will be on the supply line driver side ..should be at least 58psi and hold this ..not leak off. [​IMG]
     
  4. chevychase

    chevychase Semi-Admin
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    Throttle body is the big round thing with the red on it. in the pic..have to remove air filter system/breather to see it.
     
  5. chevychase

    chevychase Semi-Admin
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    #5 chevychase, Dec 3, 2012
    Last edited by a moderator: Mar 17, 2016
     
  6. Boudin

    Boudin Forum Moderator

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    Great posts. Couldn't have said it better myself. Just remember that the ECM is your friend here and make sure to listen to what it's saying. It should tell you which of the three things needed for a engine to fire (fuel, spark, air) is lacking.
     
  7. partsman

    partsman Full Member

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    My 1996 7.4 litre turned out to be the ignition harness, once I changed that out I have been fine.
     
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  8. chico3902

    chico3902 New Member

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    needing help

    i have a 97 gmc 5.7 4x4 engine spins over fine just no spark off of plugs / plug wires. changed out coil pack, spark plugs, and wires still nothing. has fuel pressure just no spark needing all and any help put different cam sensor and crank sensor
     
  9. gpmorgan

    gpmorgan Auto Banned

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    did you change cap and rotor? recently had same problem. it was the cap or rotor. changed both and engine fired right up. could also be the module on the coil mounting bracket. check for fire at the coil wire. if it has fire there it should be cap or rotor.
     
  10. chevychase

    chevychase Semi-Admin
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    The info ^^ gp gave is great. Do you have a service engine light? If it was a crank or cam sensor ..you will get a light.
    Any sensor usually will. Did truck just quit and not start back ? Maybe the icm/ignition module.
    Most times will not get injectors to pulse also.[​IMG] Can take to auto parts for a test.
     

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