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  1. K

    Fuel pump problem?

    My 97 tahoe with the 5.7 vortec was running fine then randomly died and wouldn't restart. Wasnt able to mess with it for a few days and when I was able to get to it it of course fired up and ran fine. That was several weeks ago now and has continued to run normally. I've watched fuel trims...
  2. K

    97 stumbles when cruising

    It now runs like timing us out but only once it's warm. Runs fine cold. Distributor was out last year and looked like new and according to scan tool is set at 0 like it should be
  3. K

    97 stumbles when cruising

    Been a while but have an update. After getting the new scan tool the Tahoe has been running great making it hard to track down problems. That is until today. This afternoon it started to run extremely rough and threw a p1345 code. Is there a way to test the cam and crank position sensors? They...
  4. K

    97 stumbles when cruising

    I will have to double check but I believe over the weekend they were -.4 or something like that. Both sides were comparable
  5. K

    97 stumbles when cruising

    I ordered a scanner that will tell me if the torque converter is locking up or not. If it isn't this is definitely something I'll look at
  6. K

    Code p0122 and shuddering

    I ordered a better scan tool than what I had so I can watch more live data while driving. If I come up with anything that way I'll let you know
  7. K

    97 stumbles when cruising

    I've never seen a plastic distributor in these. I didn't know that was a thing. Every vortec I've owned had an aluminum. All must have been swapped at some point before me owning them
  8. K

    97 stumbles when cruising

    As far as I know the distributor is stock but mine is aluminum with a plastic cap. Had the distributor out last year for a misfire problem and thought it was the gear. It looked like new still. Oil has always looked good so I don't think it's tore up the gear in that time
  9. K

    97 stumbles when cruising

    I just checked physically to make sure it wasn't loose or out of adjustment. My scanner doesn't have much by way of info like that on it. It will read codes and show me throttle position, 02 sensors and a few other small things
  10. K

    97 stumbles when cruising

    it's a innova 3040e I believe. I checked the brake switch and everything looks to be adjusted and in good order there
  11. K

    97 stumbles when cruising

    I'm going to try to make something and test it out this weekend
  12. K

    97 stumbles when cruising

    Thats a good idea. I'll have to make some sort of extension for the gauge. It's only got maybe 8 inches of line on it
  13. K

    97 stumbles when cruising

    About the same age as the injectors. Was running rough and when I checked fuel pressure it was low enough that I was surprised it even started so I put a pump in. It helped but still wasn't right. Then i discovered the deal with the injectors
  14. K

    97 stumbles when cruising

    I upgraded them a couple of years ago because the stocks were starting to fail. At the time it made a massive difference in the way it ran
  15. K

    97 stumbles when cruising

    I know I watched 02 sensor readings one of the last times I had it out and if I remember correctly there was no real change in them. As far as knock counts if my scan tool is able to tell me actual counts I haven't been able to find it on there. And I really wish I could monitor torque converter...
  16. K

    97 stumbles when cruising

    I've checked pressure at idle but never at any kind of rpm. Pressure at idle is perfect. The throttle body was cleaned not that long ago as I had the lower intake gasket starting to leak but can't hurt to try it
  17. K

    97 stumbles when cruising

    I guess that's not one of its problems then. I'm at a loss at this point. Zero codes come up throttle position sensor tests fine. Everything looks good when monitoring on a scan tool
  18. K

    97 stumbles when cruising

    So got home from work today and started to investigate with my scan tool. Haven't been driving the Tahoe because of the issues and have a spare vehicle. The battery was dead so I hooked my battery charger up to it. As soon as the battery had power my scan tool turned on even though the key was...
  19. K

    97 stumbles when cruising

    I have an Innova scan tool as well as one of the Bluetooth ones that connects to my phone. I'll look at the Innova tonight and see what info it can give me
  20. K

    97 stumbles when cruising

    What type of scan tool do I need to test that? I don't believe mine have that ability but I'm not sure where to look to see that
  21. K

    97 stumbles when cruising

    I drove around with scanner hooked to it one day and I did get a crank position sensor code pop up for like 2 seconds then it was gone. Never even set the check engine light. And from what I understand crank sensor only affects start up. I should add it runs perfect for the first 10 minutes or...
  22. K

    97 stumbles when cruising

    I don't believe it's an engine misfire but I'm not 100 percent on that. I've had a misfire issue in the past and this doesn't feel the same. And I would get a misfire code then and have no codes now
  23. K

    97 stumbles when cruising

    I've read a ton of posts on here of people having issues but nothing quite fits the symptoms I have. My 97 tahoe with the 5.7 vortec will stumble while cruising. Speed doesn't matter much just needs to be a consistent speed and rpm. 65 on the highway or 35 it will act up. Rpm will drop a couple...
  24. K

    Code p0122 and shuddering

    Not to hijack green monkeys post but that's the worst part of my issue with my 97 is it has zero codes
  25. K

    Code p0122 and shuddering

    Have you found out what was causing it? I have a 97 tahoe automatic. with almost identical issues. It has me stumped. Everything seems to test fine. I'm starting to lean toward the torque converter but if you're having the same problem with a 5 speed then I need to look into something else

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