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v6 problem ~ Won't Start in Damp Weather - 1999 Chevy Silverado 4WD

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by larrybarr, Oct 30, 2013.

  1. larrybarr

    larrybarr New Member

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    1999 Silverado v6 4x4 will not start in damp rainy weather. any ideals how to fix the problem, thanks
    #1
  2. SeanBurgandy

    SeanBurgandy New Member

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    Have you checked your air filter? Maybe your filter is clogged/wet and is suffocating the motor? Will the motor turn over if you turn the key?
    #2
  3. larrybarr

    larrybarr New Member

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    I had already disconnected the air filter, no luck with that. engine turns over good.
    #3
  4. Conlan Rose

    Conlan Rose Super Moderator

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    Have you checked your fuel pressure? It sounds like a fuel issue. That or one of the sensors on the intake side may not be reading right in damp conditions.
    #4
  5. stchman

    stchman New Member

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    Maybe you have some ignition wire problems, give those a check out.
    #5
  6. j cat

    j cat Active Member

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    remove the distributor cap check the rotor / cap for water. wires on the v6 need to be routed as OEM built or you get these type problems.
    #6
  7. Pikey

    Pikey Moderator

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    x2 on checking the cap and rotor. I had a truck in a week or so ago that had the same issue. He had taken it to multiple shops and a dealer. No one could figure it out. I talked him into letting me throw a cap, rotor, and wires on it. Problem solved. You can always pop the hood in a dark garage and spray the wires down with water. Look for arcing.
    #7
  8. j cat

    j cat Active Member

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    being the v6 engine this is the one where the ac lines drip condensation on the rotor cap ?

    if so these lines need be wrapped with tubing insulation to prevent this driping on distributor.
    #8
  9. jsmith4816

    jsmith4816 New Member

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    Does it crank? I had that issue about 5 years ago and it ended up being my started. There was this little rubber piece on the bottom that was gone. It allowed moisture in the starter making it not crank. May be something to look into.
    #9
  10. stchman

    stchman New Member

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    I don't believe the NBS has a distributor cap. I thought GM went to distributorless ignition on the Silverado starting in 1999.
    #10
  11. 99'HEARTBEAT

    99'HEARTBEAT Moderator

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    The 99"-02" NBS with a V-6 Engine.....the Engines do Have a Distributor Cap.

    Chevy 1999-2002 CK1 (03-53), Engine ASM-4.3L V6, Part 5, Manifold & Fuel Related Parts (L35/4.3W

    [​IMG]


    Last edited: Oct 31, 2013
    #11
  12. the phantom

    the phantom New Member

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    This definitely sounds like cap and rotor.. No water needs to be present for this to be the problem Just moisture in the air and a hairline crack(that you may not even beable to see)can cause problems with it.. Heres how to tell if this is what it is..
    On a day it wont start... take a hair dryer out and let it hit the cap for about 5-10 minutes. be sure its not too close to burn it obviously and then try and start it.. If it starts you will know what to replace.. I can almost say with 85% certainty that this is your problem.

    my girlfriend had a 99 jimmy that I kept hitting with the hair dryer every time it rained to start it until she had the money for the cap and rotor. Same engine 4.3liter v6
    Last edited: Oct 31, 2013
    #12
  13. j cat

    j cat Active Member

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    v6 has cap/rotor/long spark plug wires. I looked this up to refresh myself on this one. GM put the ac line over the distributor cap then it drips on the cap.. TSB about this.
    #13
  14. Pikey

    Pikey Moderator

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    Not on the V6
    #14
  15. Conlan Rose

    Conlan Rose Super Moderator

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    Yah the 99-02 4.3L V6 is a carry over from the OBS trucks.
    #15
  16. WorthFlorida

    WorthFlorida New Member

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    This is a classic ignition wire problem. The insulation of the wires break down and in damp weather they absorb moisture. The tell tail sign is on cranking or running, you'll see sparks all along the wire hitting ground.

    I had a 2002 Astro with the 4.3L and around 105,000 I decided to have the wires, rotor and spark plugs replaced. The mechanic noticed that the ignition coil was going bad where you were able to see the burn marks near the wire. If you changing wires it also is a good idea to replace the coil.
    Last edited: Nov 4, 2013
    #16
  17. the phantom

    the phantom New Member

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    Any solution to this?? Just curious if any of the clubs suggestions solved your problem.
    #17
  18. j cat

    j cat Active Member

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    I would remove the distributor cap look for arcing and carbon tracks.
    #18
  19. redvett

    redvett New Member

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    GM V6 4.3L engines had a distributor until 2014 M/Y when the "LS" 4.3L came into production it also went Dis. less.
    Yes the rotor & cap are usually the problem.

    #19

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