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  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...
  16. W

    Surging Idle: Thinking out loud

    So, if the MAP sensor passes the tests what would/could be the next thing to check? I haven't had the time to do the tests yet but I want to be thinking ahead... The vacuum hose from the MAP sensor to the throttle body has been replaced and it is in good condition, incidentally.
  17. W

    Surging Idle: Thinking out loud

    Ok...pics are uploaded! Nothing of note, just a 2500 Suburban that serves me well. Significant find today: since it wasn't raining when I got home, I thought I would do some more troubleshooting. So, I first disconnected the ESC module and started the truck-same surging in Park. After...
  18. W

    Surging Idle: Thinking out loud

    Gotcha. I will take some pics and get them posted.
  19. W

    Surging Idle: Thinking out loud

    Pix of what? :sorry:
  20. W

    Surging Idle: Thinking out loud

    Revisiting this again. I have replaced the TBI gasket and I tried driving it without the EGR vacuum solenoid plugged in. Without the solenoid, I would hear pinging when going up hills and my MPG was down. Plugged it back in and the pinging went away. At this point, I would like to know more...
  21. W

    Surging problem and cause

    :popcorn: I am following this closely for a solution...keep up the great work!
  22. W

    Surging Idle: Thinking out loud

    Yes, I would be interested. What do you have in mind?
  23. W

    Surging Idle: Thinking out loud

    Update: I went out and first did the ALDL reset for the IACV. That made a BIG difference at the first start as the truck idled MUCH lower than before (not too low, it actually sounded perfect). However, when I touched the gas pedal ever so slightly it would do the engine surge while...
  24. W

    Surging Idle: Thinking out loud

    I know this is an oft discussed topic and I've done a fair amount of research already. I would like to jot down what I'm seeing in the hopes that I'm on the right track or maybe someone knows another thing to look at. 1987 V2500 5.7L TBI. Motor has about 28K miles on it (new block) with...
  25. W

    Seat belt bolt removal tips?

    I need to replace two of the seat belts in the back seat (no shoulder belts in the 87) but I cannot figure out how to get that bolt out. I bought an electric impact wrench and impact T50 socket but that bolt is just stuck in there. Any tips? Should I move to pneumatic tools instead for more...

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