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  1. Z

    Odb1 aldl data logging

    I’ve also tried looking for vacuum leaks and I did have one previously at the pcv valve but that was fixed, didn’t change the idle tho
  2. Z

    Odb1 aldl data logging

    Yes 17 seconds it was at operating temp already so just let it idle a bit, INT is the red line on the graph O2 sensor is a new ac delco replaced 2 months ago Im not sure I thought that was the knock counts Map sensor is also new ac delco replaced a month ago Yea sorry I did get that info just...
  3. Z

    Odb1 aldl data logging

    was wondering if anyone could help me with my data I have no idea what to be looking for, I have a 1990 5.7 tbi and have been having a random shake at a stoplight and rpm drops for a second and goes back to normal when it shakes. Have replaced too many parts trying to figure this issue out and I...
  4. Z

    Which EGR valve?

    That’s what the people at advanced auto told me just found your thread and wanted to ask. Thanks
  5. Z

    Which EGR valve?

    I just put a new egr valve today, the one I took off said POS on it but the new one has an N on it, I have a 1990 1500 tbi 5.7 according to this I should have a negative egr valve? Everywhere I look online I can’t find a positive one for my truck I’m wondering if the original owner put the wrong...
  6. Z

    Need some help with bad idle

    I have a 1990 5.7 tbi with 225k miles and it runs fine when accelerating but when I’m idling in park or sitting at a stoplight I get a random shake where voltage and rpm drops for a second and goes back to normal, it’s random it can happen once or a bunch of times on my way home from work. I was...
  7. Z

    The Stupid Engine Questions Thread

    My truck is a 90 and had a plug like that for an rpm gauge, my moonie gauges didn’t have it so I added one. Not sure if that’s what yours is but kinda looks like the one I had
  8. Z

    The Stupid Interior Questions Thread

    I have a 1990 GMC Sierra, when I roll the window up or down it gets stuck at a certain point and I have to push it with my hand then it will keep going. Any idea if this is the motor or something else? Wanna be sure which part to get
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