Recent content by Matthew Jeschke

  1. Matthew Jeschke

    Tru-Cool Max 40k Transmission Cooler

    If you're only doing normal driving (no towing), even if you are doing light towing... There's little chance you're overheating. Your name leads me to believe you have a 2006? In which case you'd have electric fans. Likely you don't even need to fiddle with those but can lower temp they turn on...
  2. Matthew Jeschke

    Tru-Cool Max 40k Transmission Cooler

    I have the cluster with the temp gauge. I'd highly recommend swapping out if you don't have one. That said, under normal duty, these transmissions are really hard to overheat w/ the factory setup. I venture the bypass I installed won't activate until this summer when I'm out using 4wd climbing...
  3. Matthew Jeschke

    Tru-Cool Max 40k Transmission Cooler

    Cut into the side coming out of the radiator (liquid to liquid cooler) to the liquid to air cooler. You want to have the liquid to liquid cooler help heat up the trans to operating temperature. It's pretty simple... splice the thermostat into the lines going to the front, liquid to air cooler...
  4. Matthew Jeschke

    Tru-Cool Max 40k Transmission Cooler

    Got a thermal bypass installed. Little video below... https://photos.app.goo.gl/efD6SFgZUq1wsa1p9
  5. Matthew Jeschke

    2015 Yukon Denali Crank/No Start

    Not familiar with the DTC codes by heart. Sounds EXACTLY like when my VATS got triggered and my truck thought I was stealing it. It will turn over but then computer turns off fuel pump so it won't run. Engine MAYBE runs for a second. Does that sound like your issue? FYI ~ I think there's a DTC...
  6. Matthew Jeschke

    Truck wont start suddenly

    Maybe stating something already mentioned... But have you replaced your fuel filter? I don't know if that would help... or if could be clogged. Not entirely sure how the system works but imagine a clogged filter could really put a wrench in things. My pump at 255,000 miles was still perfect. I...
  7. Matthew Jeschke

    Random complete loss of all electrical power overnight

    You're on right track more or less. I'm sure you've checked this... But make sure you have a GOOD connection from battery to battery cables. It can be you have a break in those power cables under the hood somewhere leading you to this symptom. It would drain the battery, and be dead as a door...
  8. Matthew Jeschke

    Truck wont start suddenly

    You say cranks but won't start... As in it fires over but won't keep running? Or just cranks? FYI ~ VATS will produce a similar issue if it glitches and thinks you stole your own truck. It'll fire over but not keep running. Otherwise, if it's JUST cranking, then you need to make sure your...
  9. Matthew Jeschke

    PCM delivering wrong fuel mixture?

    Awesome just what I needed to know! Awesome, that would make most sense to me. Thanks! You hit the nail on the head. The external cooler is WAY to big. Factory I found was actually really good for what I do, despite it's really small size. It worked for 95% of what I did. The 5% I have a trans...
  10. Matthew Jeschke

    PCM delivering wrong fuel mixture?

    GREAT Help... I dove deeper into the evap system. The solenoid is broken / stuck open, and command signal is stuck high as well. EVAP SYSTEM: Purge solenoid is broken / stuck open Command signal (harness side) always 1.5Ohms to ground green / white wire. However, I assume the pink (or orange?)...
  11. Matthew Jeschke

    Tru-Cool Max 40k Transmission Cooler

    Ah gotchya, I was running my original 4L60E up to 240k miles, when I swapped with another I built up. Never had any issues with it. What temps you see with your Tru Cool cooler? Did you notice a loss in MPG? I'm also troubleshooting a 2MPG loss around the time I put the cooler on. Not sure...
  12. Matthew Jeschke

    PCM delivering wrong fuel mixture?

    I'm till working hard to try and figure this out. Not much progress so far... It's still down to 12.5 MPG from 14.5 MPG. I'm currently going over data I collected in HP tuners from previous iterations of my tune where I got better mileage. Injector duty cycle doesn't look much if any different...
  13. Matthew Jeschke

    Tru-Cool Max 40k Transmission Cooler

    Great question, I couldn't say, I need to trace the lines. I had really thought it was trans, radiator, cooler, then back to trans but honestly, I've never traced it. My temps are 100F to 120F. Ambient ranging from 45F to 75F. I think in summer when it's 115F cooler would be fine more or less...
  14. Matthew Jeschke

    Correct Tru-Cool 40k Trans cooler

    I bought the trucool bypass regrettably. It's a barb fitting to be used with ring clamp and rubber hose. Kind of chinsy. Got rid of that thermostat and ordered a Derale which uses screw fittings to connect to line set, much better and same price... although not including cost of fittings and...
  15. Matthew Jeschke

    Tru-Cool Max 40k Transmission Cooler

    Yeah I kept the radiator cooler connected. Somebody told me and I didn't know any better, that I'd not need the thermostat because I'm going through the radiator cooler. I'm throwing that tru-cool thermostat away. Cooler is getting to be a bit of a money pit :bawl: That said, guy who sold it...
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