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  1. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    I have a return style setup. My Key On Ignition off pressure is 48PSI. 7 below spec which is 55 to 62 PSI. I noticed, fiddling with my Corvette that the gauge will PEAK in the 55 to 62 PSI and settle down a bit lower, possibly even touch below that range. I'd venture you're pump is in great...
  2. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    Oh, that makes since. Hurt like heck though getting my arm soaked in fuel. On another note, Delphi got back with me. They said I need to do a voltage drop test... from relay to pump, and pump to ground. Guess I need to drop the tank... again. Sigh. At least far enough to fit some probes in the...
  3. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    @Fless thanks!!! I dug through AllData for quite a while but couldn't seem to bring up those two grounds. I internet searched them, but seems you're picture is much better than what I found on the internet. Very helpful.
  4. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    I'm going to see if maybe I have a poor ground that's leading to reduced current to the pump. Pulled this out of the FSM. But cannot find where G102 or G403 are located. Anybody know?
  5. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    Dropped the tank again. I'm loosing track of how many times I've taken the tank off at this point. I took all the lines apart. Blew air down them... No obstuctions what so ever. I even took bypass tube off rail and blew air through it in every way conceivable. I took the test port valve out and...
  6. Matthew Jeschke

    Yet another reason to keep driving an older vehicle....

    There's a cultural issue at hand here. We live in a world run by bankers. They buy up EVERYTHING because their currency is time. There's no need for them to be moral or even smart. They just need time. They've had many generations to accrue that wealth through usury. Now they can invent money...
  7. Matthew Jeschke

    AC Diagnosis?

    That's odd. What year is your truck? Mine has a mechanical fan off the water pump. It will do that if I stop at a light and idle for a while.
  8. Matthew Jeschke

    Brake Upgrade Help

    Great tip! I'll keep this in my wishlist!
  9. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    I want to scream. Swapped in a new fuel pump. It's safe to say the rest of the system is good as I've either replaced it all and or inspected it. EXACT same pressure Key on Ignition Off. Revving the engine is EVEN worse, drops to 40 PSI. Seems Delphi is selling complete JUNK, their OE...
  10. Matthew Jeschke

    Brake Upgrade Help

    Interesting thanks. I got the steel braided hoses installed. Fairly simple job. Other than center hose above rear diff ROYAL PITA. Haven't had much time to test them out. Will post once I have. Discovered my rear brake pads have like 10 miles left on them haha Glad I looked. They're GONE. Will...
  11. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    I replaced the fuel pressure regulator. Going to log some tuning data to see if it changed injector trims. My guess is not. I'm still unable to figure out what size the fuel line is coming into the rail, that is line from pump to rail by pressure regulator. I need to find an fuel test fitting...
  12. Matthew Jeschke

    A/C question

    My friend's truck does same thing, except passenger side blows hot and driver side blows worm. I may have to rebuild it for him. My diagnosis was blend door actuator as well, but haven't had time to take it apart and confirm for him. It's either that or the switch but likely the door. I think...
  13. Matthew Jeschke

    Leaking fuel after fill up

    Crawl under your rear driver side quarter panel behind the tire and below the fill spout. There's two rubber hoses running back to the top of the tank... One is a fill and I think the other is a vent? Check to make sure the fill doesn't have any cracks. Otherwise, I'm with @Fless maybe a leak...
  14. Matthew Jeschke

    What have I done....part 2

    Funny thing is, I think plants like the carbon our vehicles pump out. It's like food for them.
  15. Matthew Jeschke

    What have I done....part 2

    There's another option, pull your front downpipes to collector ( you'll have to drop the transmission frame member (not too big a deal support it with a jack, it'll actually hang on the engine mounts by itself but not a good idea to do that). Then get another factory downpipe from ebay or a...
  16. Matthew Jeschke

    What is this part that is leaking coolant?

    It's called a coolant bypass seal (or head steam port crossover). I presume they are the same my truck took but confirm your year, make, and model on RockAuto... There they are $6.06 plus tax & shipping. https://www.rockauto.com/en/moreinfo.php?pk=1027883&cc=1371620&pt=10222&jsn=473 ITC billet...
  17. Matthew Jeschke

    Brake Upgrade Help

    @Sam Harris that's awesome! I'm eager to do this now... I noticed one additional "Potential Upgrade" but not sure about master cylinder fitment... There's two part numbers for the master cylinder. The first is a 1.338in bore...
  18. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    I want to test pump pressure at this point. Not making much headway with the HP Tuners stuff. Unfortunately, my fuel test kit doesn't have the right fittings to even rig something up to test the pump. The parts store doesn't rent anything that would fit either. I'm looking for a fitting that'll...
  19. Matthew Jeschke

    Recent Purchase '05 Tahoe PPV Fleet 4.8 L V8 4x4 185+mi

    Few tips... service ALL fluids when you buy a vehicle with that many miles. I didn't do this on mine and rear diff fluid was BAD BAD BAD, I had to replace the diff when it blew up. Could have possibly avoided that putting new fluid... and certainly by removing cover, inspecting, and repairing...
  20. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    Think I found it.... the tune file is corrupt! Editor likes it but PCM does not... when loaded to PCM it WON'T read VE table correctly. No matter what I set in the VE table it has no affect on fuel delivery (this is where you adjust open loop fuel in speed density mode). My Fuel trims showing...
  21. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    Worked on it for a few more hours. Quite a lot of mods: However, essentially it's a LQ9 6.0L w/ cam and flex fuel injectors (bit I think 32# / hr instead of 24# as I have it setup). NO Vacuum Leaks: Tested using your starting fluid method. Great tip! And I didn't even blow myself up! FOUND...
  22. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    @Scottydoggs been tuning it for a couple years now. Running speed density... fuel was spot on a few weeks ago. I'm going to give this an adult dose of fuel injector cleaner... It also dawned on me, due to fuel rail design, the fuel comes in closer to bank 1 so if the pump doesn't provide...
  23. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    Any idea why that doused me in fuel like that? Shouldn't the pump stop that from happening? Is it cause I have a poorly sealed gas tank or something? idk... Never experienced that before changing a fuel filter.
  24. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    Yes, I'm watching both short term and long term. There's a split of 3% over 1500 RPM. Bank 2 is running 3% leaner than Bank 1. Oh God, I went to put in the new fuel filter. What a nightmare. I'm in quite a bit of pain. I depressurized the system. Then disconnected the line set going through the...
  25. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    I thought I maybe aggravated the code by troubleshooting this. It seemed to come up when I started it and it was running really lean. I will pull some spark plugs and see how they look. hrm...

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