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Thread: 2000 chevy silverado 5.3 starts And dies

  1. #1
    Senior Member asifford5's Avatar
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    2000 chevy silverado 5.3 starts And dies

    The truck starts starts and then dies within 30 seconds after a few starts it won't start up at all may be computer related? I have no idea where to start
    1990 GMC K1500 4x4 SB 350 (daily driver)
    1988 Chevy V-20 Scottsdale Suburban 4x4 SB 350 (project)

  2. #2
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    Need to test fuel pressure should be running around 60psi.
    1994 white ext cab chevy silverado 5.7 rolling 230k miles
    stock with air filter lid flipped,
    open flowing exhaust to a 40 series flowmaster dumped.
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  3. #3
    Senior Moderator chevychase's Avatar
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    Also should hold the pressure..can check with key on..also need to find out if fuel .or spark that it lacks on a no start.
    If a service light on scan for a code ..if light is on ..maybe crank sensor..a symptom of a crank sensor.
    But do not replace till you check for lack of spark and fuel..and scan.
    Will have a valve on fuel supply line at intake to check pressure..might rent a gauge at auto parts.
    If it is senor related should have a service light.

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  4. #4
    Senior Member asifford5's Avatar
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    Not sure if it matters but its got a 4.8 in it not the 5.3
    1990 GMC K1500 4x4 SB 350 (daily driver)
    1988 Chevy V-20 Scottsdale Suburban 4x4 SB 350 (project)

  5. #5
    Senior Member asifford5's Avatar
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    It has 3 codes
    P1122P1637
    P0122
    1990 GMC K1500 4x4 SB 350 (daily driver)
    1988 Chevy V-20 Scottsdale Suburban 4x4 SB 350 (project)

  6. #6
    Senior Member Sodell's Avatar
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    P1122 TP Sensor Circuit Intermittent Low Voltage
    P1637 Generator L-Terminal Circuit
    P0122 is your TPS, that is where I would start after you check the fuel pressure

  7. #7
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    leolkfrm's Avatar
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    ecm temp switch...try fuel down the throttle body, if it starts feed fuel and see if it will continue to run
    4 wheels move the body
    2 wheels move the soul
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  8. #8
    Senior Member asifford5's Avatar
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    It will not run any longer then usual with starting fluid into the throttle body
    1990 GMC K1500 4x4 SB 350 (daily driver)
    1988 Chevy V-20 Scottsdale Suburban 4x4 SB 350 (project)

  9. #9
    Senior Member asifford5's Avatar
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    We hooked up the fuel pressure Guage and turned the key and had 35 psi then started it and the Guage jumped between 30 and 35 psi then it died with 0 psi and turned key off and back on and did not build up any pressure. How much pressure does the 4.8 need? Why would it just stop pumping?
    1990 GMC K1500 4x4 SB 350 (daily driver)
    1988 Chevy V-20 Scottsdale Suburban 4x4 SB 350 (project)

  10. #10
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    leolkfrm's Avatar
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    do not use starting fluid...not good for the engine! when dumping gas in the throttle body and it will not continue to run it sounds like a spark problem...dumping gas in would make it a fuel problem...check spark at teh plugs when it wont start
    4 wheels move the body
    2 wheels move the soul
    B.W.A.I
    Snow is a lot like religion and a lot like sex....you never know when you are going to get it!....or how much you will get

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