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Hard start on 98 chevy 5.7L

Discussion in 'Chevy Trucks' started by cameo89, Dec 18, 2011.

  1. cameo89

    cameo89 Senior Member
    Messages: 669

    Hello all, My 1998 chevy silverado 5.7L Vortec used to start as soon as you bump the key, and now it is hard to start (mainly when its cold) it takes several cranks of the engine to start and after truck warms up its okay, usually in the morning or if the truck sits for several hours after running.

    I think its a fuel problem, maybe fuel filter

    (i.e. I had just did a complete tune up on my truck about 7-8 months ago and I didnt skimp on parts, so I dont think its a firing issue)

    Thanks in advance for your help
     
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,958

    I know gms had issues with the spider injectors. Another is the fuel pumps. Could also be regulator. Filter ehhh that wouldn't cause it to start fine hot. Definitely start looking at your fuel supply
     
  3. TJS

    TJS PlowSite.com Addict
    Messages: 1,339

    Fuel pump. Do not use aftermarket if you replace it. Use AC Delco or GM otherwise you will be doing it twice.
     
  4. goel

    goel PlowSite.com Addict
    Messages: 1,079

    Try turning the key on, wait 5 to 10 seconds - then crank.

    We have a 5.7 that if you just crank, it cranks for the 10 seconds. If you turn the key on and wait the few seconds, then crank it it catches immediately.

    When warm, catches immediately - its only with the cold start.
     
  5. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Fuel pressure test is in order
     
  6. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,958

    Sounds like you have the same prob. Goel, a gasser shouldn't do that
     
  7. goel

    goel PlowSite.com Addict
    Messages: 1,079

    Lol, its the only problem a 11 year old truck has. We can turn the key and wait for it to energize before cold starts.
     
  8. NICHOLS LANDSCA

    NICHOLS LANDSCA PlowSite Veteran
    Messages: 4,305

    If I remember right spec is 60-66psi to start
     
  9. 70monte

    70monte Senior Member
    Messages: 468

    It sounds like the fuel pressure regulator to me. If it has to crank when cold but not when it's warm, it sounds like it is bleeding off fuel pressure while it sits for a while. How many miles on the truck?.

    Wayne
     
  10. cameo89

    cameo89 Senior Member
    Messages: 669

    Im gonna do a pressure test this weekend

    and truck has 179k miles, I have owned it for 3 yrs and never replaced anything fuel related other than fuel filter
     
  11. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,958

    Psi test sounds good. Do you know if the pump has ever been changed? 179 on a plow truck pump seems like a lot for original to me
     
  12. cameo89

    cameo89 Senior Member
    Messages: 669

    Truck has never had a plow on it till I installed it 2 yrs ago
     
  13. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,958

    oh,,ok. still sounds like alot of miles for the original pump lol.
     
  14. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Generally a leaking fuel pressure regulator on these trucks will result in hard starts when hot.
     
  15. cameo89

    cameo89 Senior Member
    Messages: 669

    ok guys, I just tested the fuel pressure and its not good....turn the key on and 65psi and dropped to almost 0 zero within 10 seconds, so new fuel pump assembly soon! wish it would fricken snow already....I need money! :(
     
  16. cameo89

    cameo89 Senior Member
    Messages: 669

    well my truck is still plugin away, still time delayed to start but she still starts and goes...goin in the morning to buy the new $368 fuel pump assembly, gonna change that and a new filter and hope that this fixs the problem, last thing I want is for it to die on me while plowing, looks like a little snow next week, fingers crossed. Ill update once its installed.
     
  17. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,958

    Thanks for the update, good luck with the install.
     
  18. cameo89

    cameo89 Senior Member
    Messages: 669

    got it done, only took about 1 hr 30 min to remove old and install new pump assembly and filter...so far so good.
     
  19. cameo89

    cameo89 Senior Member
    Messages: 669

    woke up to a little bit of snow and temps near 30 deg, my truck started as soon as I bumped the key, so glad changing the fuel pump assembly and filter fixed it, now Im ready...Bring on some Snow!

    Thanks everyone for your ideas and advice
     
  20. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,958

    Thanks for the update again. Didn't sound like you had that hard of a time.