Recent content by wczimmerman

  1. W

    Where can I find this part?

    Perfect! Thanks for posting the part numbers!
  2. W

    Where can I find this part?

    So, does this part do double duty as a filter and check valve?
  3. W

    Where can I find this part?

    Does anyone know what the part on the brake booster line (highlighted with the red arrow in the picture) is called and where I can get it? I may need to replace the vacuum booster hose and I'd like to get this as well. I can't find the hose either...
  4. W

    Surging Idle: Thinking out loud

    I have not taken a dive into the MAP question you mentioned yet. I have had a list of things that are part of the normal maintenance that I have to tackle first, time and weather permitting (no garage). The tune up, etc were on that list. I have an ACDelco O2 sensor coming to replace the...
  5. W

    Surging Idle: Thinking out loud

    Drove the truck into work this morning and while the pinging is gone, the surging is still present, though significantly reduced and the pulses are longer in duration. In other words, the frequency of the up and down of the idle is less and the amplitude of the RPM change is less. The tune up...
  6. W

    What do you make of this timing?

    Thanks to everyone for their replies! This is most embarrassing: My "advanced timing light" was apparently too advanced for me...I was using it wrong which resulted in the strange behavior shown in the video. I was in the RPM mode and pressing the light (and holding the button) thinking that...
  7. W

    Surging Idle: Thinking out loud

    Well, this is embarrassing... Apparently, my new "advanced timing light" was too advanced for me! I wasn't turning on the timing light correctly which resulted in the erratic reading for the timing. Once I figured out the right setting, it worked great. The timing was about 1-2* and...
  8. W

    Surging Idle: Thinking out loud

    Yes: I forgot to mention that. The EST (advance) wire was unplugged and I put new plugs, cap, rotor, air filter, and oil in at the time, too.
  9. W

    Surging Idle: Thinking out loud

    Got out today and replaced the distributor cap and rotor, spark plugs, air filter, and oil. I then checked the timing but the mark was all over the place. I am not sure what to make of it. Here's the video: https://www.dropbox.com/s/64hylrwwos7fssu/20170408_123212.mp4?dl=0
  10. W

    What do you make of this timing?

    Here's a link to a short video showing what I am seeing when checking the timing. I am not sure why it doesn't hold steady. The advance connector was disconnected The truck was at operating temperature https://www.dropbox.com/s/64hylrwwos7fssu/20170408_123212.mp4?dl=0 Any thoughts...
  11. W

    Surging Idle: Thinking out loud

    Thanks. I will take a look at the MAP tests as soon as I can get a vacuum pump and some time to do them. I did reset the IACV today figuring that it might need it anyway with the new MAP and temp sensors this weekend. It is interesting that it starts at a much lower but smooth idle (motor...
  12. W

    Surging Idle: Thinking out loud

    And, no, I have no trouble codes (other than the ones I've generated with my testing). Replacement ECM, huh? Interesting that you said that since I have a coworker that mentioned the same thing on an old Chevy he used to have. It looks like it's above the glove box though I'm not entirely...
  13. W

    Surging Idle: Thinking out loud

    When I start the truck? Yes.
  14. W

    Surging Idle: Thinking out loud

    I drove the truck for a few days with the MAP sensor disconnected and I had no surging idle. Saturday I installed a new ACDelco MAP sensor: idle still surging. This evening I installed a new ACDelco coolant temp sensor: idle still surging. To recap: the idle only surges when in Park. In...
  15. W

    Surging Idle: Thinking out loud

    Did a little test this evening by first trying to pinch off the vacuum line to the MAP sensor and see if that made any difference. Surprisingly, it didn't. However, if I pull the vacuum line completely while the truck is running it dies instantly. For my final test, I pulled the electrical...
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