1. Chevy Truck Forum

    Welcome To GMTruckClub.com!

    The #1 Chevy Truck Forum Online

    Online since 2004, we're the #1 Chevy Truck & SUV user community. If you have any questions about your Chevy or GMC Truck, SUV or Crossover, or just want to connect with other GM owners and enthusiasts around the world, you've found the best place on the internet to do that.

    Join Today ~ It's Free

    Registering is Free and Easy! Do it today and we'll see you on the forums soon!

Moisture problems??

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by fpb1529, Aug 29, 2009.

  1. fpb1529

    fpb1529 New Member

    I own a 99 Suburban 1500, 2wd 132,000 miles. I replaced the distributor cap a few months ago because I noticed it ran rough when the roads were wet or their was high humidity, it ran fine for a few months. Yesterday it was difficult to start and ran rough (sputtering) for about 10 miles then ran fine. This occured after a bad rain storm had passed however the roads were dry. Any help would be appreciated
  2. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    Welcome to the Club. How about the wires? Old wires break down when they get wet. That would be the next logical step.
  3. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    Wires are the likely cause. Get nice wires from NAPA. The premium Blue Max by Belden. They're like $75 for the Vortec. Also, put your distributor cap off again, and make sure the two vents are clear. There's one on the left side, about 7 o'clock i think. The other is on the right, in the dropped down section. I used a rubber tipped blow gun.
  4. tattooed4life

    tattooed4life Epic Member 5+ Years 500 Posts

    I was told by a mechanic here in town to knock the screens out the vents, change the wires to good ones, and replace the cap. After doing all of this with good quality delco parts (cap&rotor) my truck never acts up in the rain. Good Luck
  5. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    I couldn't see/find the screens.
  6. fpb1529

    fpb1529 New Member

    I took the cap off and found a small nick on the edge, I believe moisture could get inside. It looks like the button swung around and damaged it. Any idea why this happend?
  7. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    Button??? Do you mean the rotor?
  8. fpb1529

    fpb1529 New Member

    Yes, I am sorry the rotor. I went ahead and bought a new cap and rotor at Auto Zone. I wanted to see if this one got damaged before I paid more for an AC Delco set. My plug wires were replaced about two years ago with the Belden wires. If this does not work I am going to put new wires and plugs on it, then if that fails I will just have to take it to a mechanic.
  9. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    If the rotor hit the cap, it may have been installed incorrectly. Also a possibility is that the cap wasn't seated well. Which could allow lots of moisture underneath. The screw bosses on the plastic dist base have a tendency to break/strip so the cap might be flopping around a little.

Share This Page