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  1. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    I will see if there's another fitting for return line. I was trying to use the T adapter. I probably pictured doing it wrong. I noticed I occasionally get a P0141 O2 Heater Circuit (Bank 1, Sensor 2)... I only replaced the front O2 sensors (ones closest engine). I revved engine from 600 to...
  2. Matthew Jeschke

    ISO: Wiper arms with splines

    Can you post a picture? I'm thinking your talking about where the arm attaches to the pivot / shaft on the whipper regulator? Mine are splined... is what confuses me. All of them I've taken off are splined. Maybe you mean somewhere else?
  3. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    @Scottydoggs thanks for tip... The O2's are new also confirmed readings with Wideband. PCM is correctly reading AFR and trims are adjusting fuel as expected. If I reset the trims the engine will stumble and misfire. Just I don't know where the 20% trim / fuel error is coming from. If it was...
  4. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    Made another post on troubleshooting fuel system HERE
  5. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    I'm moving this from another thread. My fuel mileage has been suffering for quite some time and I think this is contributing factor. I honestly, only really know basics of troubleshooting fuel pressure. Maybe this is operating correctly, or maybe not? Vacuum Check: I did a sanity check, revved...
  6. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    Awesome thanks! I never saw over 50 PSI even with key in engine off. Was around 50 PSI with engine running though (maybe that's cause of my Flex Fuel injector swap...) I don't know why it bled pressure like it did. Looking a bike pump test to check the system for leaks as well as the check ball.
  7. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    This is a fuel problem. Rented a fuel pressure gauge. Rail pressure is 50 PSI running. Should be 55 to 62 PSI. Rail doesn't hold pressure. After turning engine off see an immediate ~2 PSI drop and over course of a few minutes it continues to slowly fall. Fuel pump is new. I don't see gas...
  8. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    DANG thanks @strutaeng I'm in process of ordering new parts... Pressure regulator has 270k on it, fuel filter probably around 50k so need replaced regardless but I'm trying to find ways to narrow down my troubleshooting. That's super helpful! I'm also going to give truck and adult dose of...
  9. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    Gal darn, my fuel mileage took a dump again. I plugged in my scanner though and realized fuel trims are at 20+%!!!! I had tuned to well within +/- 5% on open loop. Closed loop got me down to within a percent. Long story short, I think I possibly uncovered a mechanical gremlin. First I...
  10. Matthew Jeschke

    Brake Upgrade Help

    I'm working on this myself, I wouldn't use that power stop kit. I'd upgrade to GMT900 front brakes and dual piston GMT800 on rear if you don't already have that. That GMT900 brakes will require you have 17" rims though. If you have the 17" rims they're are direct bolt on. You can get the power...
  11. Matthew Jeschke

    Best flex brake lines?

    Thanks everybody I found a made in the usa set of braided flex lines. There's a couple other made in China kits but I didn't even want to go there despite good reviews on Amazon and lots of YouTubers using it... Although, really that might be a warning sign in itself...
  12. Matthew Jeschke

    Loosing coolant. Underhood coolant smell

    @Matahoe you can typically rent a radiator pressure tester at your parts store. Note you may have to clamp off the resivour overflow hose depending on the pressure tester's design. @Ken Casher 's suggestion to replace radiator is solid advice. It's only a matter of time till the plastic end...
  13. Matthew Jeschke

    Loosing coolant. Underhood coolant smell

    Buy contrast dye... put it in the resiviour. Also check you engine oil of you havent already. then use a black light. Also pressure test with radiator tester, both hot and cold... you maybe able to simply heat engine up and look without the tester once it is to pressure. How many miles are on...
  14. Matthew Jeschke

    07+ Brake upgrade on a 00-06 NBS, is it worth it?

    I'm looking into doing this. That said, my 2001 brakes are pretty awesome as is. I can easily lock all four tires up / kick in ABS. Anyways, why not sounds like the GMT900 setup for fronts is a direct bolt on with 17" tires. Forgive me if I've not read all the 53 pages on this post to glean...
  15. Matthew Jeschke

    2004 yukon denali 6.0 awd BALL JOINT REPLACEMENT

    @15burban oh gosh, I cannot speak for @talkyukon but I went same route as him rebuilding my own control arms. It was much cheaper, especially when you figure in having to get an alignment because the control arms were swapped out. If you JUST do the upper and lower you can possibly get by w/o...
  16. Matthew Jeschke

    Wife hit a pole....

    I remember when my mom drove through the garage door when I was a kid. Then she hit the mailbox a couple times trying to get mail from car. My father however, bought a BRAND new truck. We got stuck, went to give him a push and he gunned it... My mom and I almost face planted in the snow as he...
  17. Matthew Jeschke

    2004 yukon denali 6.0 awd BALL JOINT REPLACEMENT

    You may like to note the direction old ones were in and compare to new ones. I replaced mine years ago. The big thing will be the grease zert installs in a direction that you can access! If you don't put it in right then you'll never be able to grease the lower ball joint. FYI ~ I used several...
  18. Matthew Jeschke

    Best flex brake lines?

    My truck chassis has 270,000 miles on it. I think it's time to go through the brake system and start upgrade and replacing parts as preventative maintenance. My first item to attack will be the flex lines. I see there's multiple companies out there but not really sure what is "marketing hype"...
  19. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    Thanks! I am truly flattered. I just haven't had time to check the posts for a few days. My life is an absolute disaster as of late. I used to work as an engineer. Switched to sales. I use my truck to get my engineering fix lol
  20. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    @exp500 wow that's facinating https://paulpantone.com/ @SnowDrifter I think I found the underlying issue. Still testing to confirm. But times to gas station for filling up and I got 15MPG. Last weekend I took time to key my written fuel log into the computer. I compared it's dates with my...
  21. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    Ah super cool! I am so annoyed that they come up with all these technological gadgets to boost MPG. When we had it several decades ago with small commuter cars. Additionally, Germans are AWESOME at MPG (they also over engineer other things to insane levels but another topic). I was FACINATED by...
  22. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    I may have FINALLY found my issue, but honestly, this might be the 10th time I found the issue haha. Need to collect more data yet... I had to turn off misfire detection. I'm running an aftermarket cam. Otherwise, as far as the engine running smooth... It runs SILKY smooth. Power is good, etc...
  23. Matthew Jeschke

    2015 AC Only Cold When Driving

    It should be cycling on and off... UNLESS controller see's it's low on refrigerant. My guess is you have a leak somewhere.
  24. Matthew Jeschke

    Designing a Custom Bluetooth Upgrade

    Oh cool... This has been along journey. I am a salesman by day, engineer when I have time. My background is engineering. Anyways, my time RAN really short, as my mom got sick and I had to help out the last couple years. I also got distracted and built out this YouTube channel when I should have...
  25. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    Bit of a long story, I went from 15MPG down to 12.5MPG. Did a few changes to tune, fixed evap issues, etc. Reverting tune seemed to have a limited effect on MPG. Last thing on my list seems to be the intake. I called the company. They were very responsive and tried to answer my questions but...

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