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  1. S

    This is what happened to my tahoe in May

    Glad to hear your daughter is okay. If the airbags didn't deploy on a collision that caused that much damage you might want to go over the entire system and make sure all your impact sensors are functional. It's possible that the system was not functioning correctly but didn't throw any codes.
  2. S

    knock sensor selection

    I tried to buy a clone through chinacardiags a while ago but found the process less than desirable. When ordering the website indicated that they had something in stock but after the order was confirmed I received an email indicating that shipping was delayed due to low stock and then they tried...
  3. S

    knock sensor selection

    I think its in the 280k km range now so not super high mileage. I've already confirmed that the injectors are flowing as they should using the Tech2 diagnostic feature. The miss is only very slight and not very pronounced at idle. You can barely feel the misfire at idle with your hand on the...
  4. S

    knock sensor selection

    It happens to mine every time I try to do anything with live data. If I am just reading codes or interacting with the vehicle in any other way it’s fine. I’ve tried many of the same things you have and I don’t think it’s on the truck side because it was at a dealership a number of years ago to...
  5. S

    knock sensor selection

    I’m hoping that it isn’t … fingers crossed
  6. S

    knock sensor selection

    I don’t think RockAuto has Delco at the moment - we’re Delphi OEM?
  7. S

    knock sensor selection

    Hey folks - I'm tracking down a persistent misfire (which has grown more frequent with time) in my 04 Burb which only seems to occur when in tow/haul mode, even when not pulling anything. Live data shows misfire on 1 & 6 that trigger the CEL with a very small number of misfires logged in the...
  8. S

    2004 GMC Yukon Denali XL power driver seat problems..

    When I’m troubleshooting electrical issues I always use a separate 12v source to isolate motors and switches. I don’t have one of those fancy 12v probes, I just use some jumpers jammed into a 12v cordless tool battery. You can open up connectors and test individual components or you can back...
  9. S

    VCX Nano connection issues

    Thanks for this. I will do a search and see what I can come up with. I’ve been over most of the grounds due to a previous electrical issue (bad engine ground) but will have a look at them again.
  10. S

    VCX Nano connection issues

    Other devices and the VCXNano stay connected for all functions besides the live data collection. I haven’t had a chance to try out that function on another GM vehicle to see if it’s software/hardware or the truck.
  11. S

    VCX Nano connection issues

    Yeah, everything is up to date with the latest firmware and the licenses are valid. I’ve also tried a new cable to no avail. I have a sneaking suspicion that it’s a wiring issue on the truck side but I’m not sure where to start investigating.
  12. S

    VCX Nano connection issues

    anyone have any ideas???
  13. S

    VCX Nano connection issues

    Hi folks - I am having some connection issues with my VCX Nano running Tech2Win on an old laptop. I am attempting to chase down a persistent misfire issue in my 04 Burb SLT AWD. Whenever I attempt to collect live data the VCX Nano always drops the signal - at best I can get about 30 secs of...
  14. S

    P0300 only when in tow/haul

    Tried disconnecting the trailer brake controller which is the only aftermarket item I can find and still nothing - keeps booting me out of live capture data. A bit stumped and not sure what to try next. If the cam/crank sensors are out of sync or defective would I need to be able to do this...
  15. S

    P0300 only when in tow/haul

    Interesting. I don’t have anything aftermarket except a brake controller. I’ll try pulling that tomorrow and see if that helps.
  16. S

    P0300 only when in tow/haul

    Been attempting to run the cam/crank correlation for two days now but I cannot seem to complete it. I am using a VCXNano to interface with the truck and Tech2win to talk to the ECM. I installed the setup as directed and it works fine as long as you are not accessing live data. In this situation...
  17. S

    P0300 only when in tow/haul

    Awesome, thanks. Any tips on what is involved in the process? Do I need anything other than the Tech2?
  18. S

    P0300 only when in tow/haul

    That’s what I figured. That’s next on the list then.
  19. S

    P0300 only when in tow/haul

    Do you know what menu item that is buried under?
  20. S

    P0300 only when in tow/haul

    Alright, finally got a pressure tester that would fit and did a compression test - here are the results: Fuel injector balance test - all injectors powered up to ~59-60psi, dropped momentarily to ~40psi and the cycled down to 32psi Compression test results 1 - 150psi 2 - 155 3 - 160. 4 -...
  21. S

    P0300 only when in tow/haul

    I am going to pick up pressure and compression testing tools tonight on loan from the local auto parts store. The plan is to do those tests tomorrow along with trying the coil balance test as well.
  22. S

    P0300 only when in tow/haul

    I’m new to the Tech2 as well but from my understanding you can use it to test the injectors in place. You need to connect a fuel pressure gauge as well - I assume that is to monitor the pressure as the injectors are cycled through.
  23. S

    P0300 only when in tow/haul

    I was able to find the injector test in the Tech2 but I don’t know where the coil balance test is - any suggestions?
  24. S

    P0300 only when in tow/haul

    Delco plugs if I remember correctly and Denso wires. 270k km on the engine. I haven’t done a compression test on it since buying it at 225k km. Should probably look at that now.
  25. S

    P0300 only when in tow/haul

    Moving a coil from 1 to 3 had no effect. Plugs and wires are new(ish), within 25k km. #1 plug shows good. Tech2 is still showing persistent misfire in tow/haul but only occasional in regular mode. Should I be looking at cam position sensor or just move onto fuel?

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