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  1. R

    2000 7.4L Vortec K3500 turns over but won’t start

    I put the new distributor cap and rotor on and it started right up. So, for anyone else that finds thread with symptoms similar to mine, check to see if the spark at #3 cylinder is firing multiple times per revolution when cranking. If so, replace the distributor cap.
  2. R

    2000 7.4L Vortec K3500 turns over but won’t start

    The distributor has a lifetime warranty. The parts store will let me replace just the cap and rotor under warranty (I don't want to replace the whole distributor). I'm going to give this one more chance. If I have another problem I'm going to put my original distributor back in (there is...
  3. R

    2000 7.4L Vortec K3500 turns over but won’t start

    So I checked the spark on #3 cylinder and it was sparking about 4 times per revolution. I pulled the distributor cap and I can see a faint arc trace between the center post and the thick section that insulates the conductor going to the #3 post. So off to the parts store for a new cap...
  4. R

    2000 7.4L Vortec K3500 turns over but won’t start

    I don't have a scan tool. Is this something with a bluetooth OBDII reader (OBDLink MX+) and Torque Pro or similar app if the engine won't start? I'll try that. I used Torque Pro to set the cam retard. I borrowed a professional scanner to do the crankshaft relearn procedure (even though I...
  5. R

    2000 7.4L Vortec K3500 turns over but won’t start

    My 2000 7.4L Vortec K3500 won’t start. It has 96,555 total miles on it. I replaced the engine 2 years ago with an ATK remanufactured long block and I’ve only put 2000 miles on it since then. I also replaced the complete distributor (including cap, rotor, cam sensor, etc.), spark plugs, and...
  6. R

    4L80e doesn't downshift sometimes

    Thanks All!
  7. R

    4L80e doesn't downshift sometimes

    ^^^ I'm assuming you mean the one in the transmission pan (I didn't know there was one there). I have an option to read transmission fluid temperature so I guess it uses that sensor. Thanks
  8. R

    4L80e doesn't downshift sometimes

    ^^^^ This helps. Do you know what temperature sensor it is using? Thanks
  9. R

    4L80e doesn't downshift sometimes

    ^^^ That would be appreciated! It would help me focus on what to monitor. My truck doesn't seem to run hot but maybe a faulty sensor. Thanks
  10. R

    4L80e doesn't downshift sometimes

    I have a 2000 7.4L K3500 with a 4L80e transmission. Sometimes when I'm hauling a heavy load (truck camper) up a grade the truck won't downshift into a lower gear even if I move the gearshift lever to a lower position. The engine temperature may be a little above the middle mark on the gauge...

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