1. Welcome to PlowSite. Notice a fresh look and new features? It’s now easier to share photos and videos, find popular topics fast, and enjoy expanded user profiles. If you have any questions, click HELP at the top or bottom of any page, or send an email to help@plowsite.com. We welcome your feedback.

    Dismiss Notice

97 3500 w/ 454 won't start

Discussion in 'Chevy Trucks' started by highlander316, Jan 26, 2011.

  1. highlander316

    highlander316 Senior Member
    Messages: 578

    my 97 3500 won't start. Has the 454 with 5sp. It has spark and fuel. Coil has been replaced, cap/rotor been replaced, and the cam position sensor has been replaced. All the motor does is crank and sputter every ~5 seconds. No idea where to check next. Was told the distributor could be bad (my guy says it goes up and down like 1/4" while attempting to start). Any ideas? Thanks.
     
  2. NICHOLS LANDSCA

    NICHOLS LANDSCA PlowSite Veteran
    Messages: 4,310

    Have you actually checked the fuel pressure? Have you checked the fuel pressure regulator?
     
  3. maverjohn

    maverjohn Senior Member
    Messages: 902

    Fuel pump, you my have fuel at the line but you need good presure to make the injecters work correctly, something like 13 to 18 psi if I remember right, good luck.
     
  4. NICHOLS LANDSCA

    NICHOLS LANDSCA PlowSite Veteran
    Messages: 4,310

    It's a Vortec motor not TBI, he needs 56-62psi
     
  5. jklawn&Plow

    jklawn&Plow Senior Member
    Messages: 469

    Is the fuel pump original?
     
  6. 70monte

    70monte Senior Member
    Messages: 468

    That truck needs between 54-66psi of fuel pressure to run correctly. I was going to suggest the ignition control module but if you are getting spark, its probably not that. The distributor gears are know to go bad but you usually get a misfire situation instead of a complete no start. Maybe something in the distributor broke. What about the crank sensor down by the harmonic balancer.

    Are there any codes stored in the computer? Good luck.

    Wayne
     
  7. highlander316

    highlander316 Senior Member
    Messages: 578

    no codes. I'll check the fuel pressure tomorrow. Thanks guys.
     
  8. highlander316

    highlander316 Senior Member
    Messages: 578

    ok I have 50psi with the key in the on position. When trying to crank it goes down to 30 and bounces up and down a bit. A few people I have talked to said it sounds like a timing issue.
     
  9. 70monte

    70monte Senior Member
    Messages: 468

    I just looked in my factory service manual for my 98 and it says with the key on, the fuel pressure should be 55-62 psi. If the fuel pressure is less than 44 psi, the vehicle will be inoperable. When you pressurize the system, does the fuel pressure bleed down much? The manual states that after you turn the fuel pump on and then off, the fuel pressure should stay between 48-52 psi.

    It sounds like you have a fuel pressure issue. If its only getting to 30 psi while cranking, you don't have enough fuel pressure for the truck to run.

    It could be a leaking in tank modular fuel sender, fuel pressure regulator, fuel injectors, or a gas line leak. When was the fuel filter changed last?

    Wayne