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    Gas Mileage

    Nope, but I work with quite a few(no idea how many, because no one cares about GPA once you graduate and get your first job). I also don't work for an automotive OEM. Seems like you missed the whole point of what everyone is saying here... GPA doesn't mean much. Engineers aren't superhuman and...
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    Gas Mileage

    He's right though.. and I don't know any engineers that would be insulted by his statement. The school I went to had a 22% graduation rate for engineering tracks. You usually lost most of them in the second or third year where the real math and application courses started. "C's get degrees" is...
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    Want to Learn To Tune - Need help getting started

    I have HP tuners now because I needed it to be able to tune my 2011 Suburban, but I started with an OBDxPro VT(now discontinued and moved to the VX for the same functions plus more) https://obdxpro.com/product/obdx-pro-vx-obd2-diagnostics-and-tuning/ Using that tool, you can then use free...
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    Gas Mileage

    Since we are getting technical here... once you start going above 100mph, you actually hit a point where the amount of drag you have to intentionally create to make downforce on rear tires to have enough traction to keep moving forward surpasses the amount of drag generated from the frontal...
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    99 L29 454 build

    Yeah... that's what I said... in detail... two posts above yours. The less restriction you give the intake manifold to the outside air, the less vacuum you will see at WOT. 29 inches isn't necessarily absolute vacuum. That is a gauge measurement that would show close to absolute vacuum...
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    All years had that. That is the line that you were asked to check and remove to verify FPR function way back in the first pages of the thread. It should be a short vacuum line running from the FPR to the back of the manifold. It is very common for it to rot out and cause a big vacuum leak among...
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    99 L29 454 build

    Volume isn't changing? How do you think an engine works? That piston moving down in the cylinder while the intake valve is open and the exhaust valve is closed is increasing the volume of the area after the throttle blade. This change in volume is what drives the pressure down(creates vacuum)...
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    99 L29 454 build

    I think you are fundamentally misunderstanding how all of this works. The entire area is hotter than ambient air. You are always going to be adding heat to the system without an intercooler or atomizing fuel. Velocity is not a part of the ideal gas law. The only reason pressure is...
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    99 L29 454 build

    No, that's not how that works. You can see from the data that the Temperature isn't even remaining constant, you are actually pumping heat into the air the entire way into the cylinder. Also, technically pressure isn't dropping. You are actually increasing the pressure in the manifold from idle...
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    That is not the spec with the return line blocked off. As others have said... repeatedly. Those symptoms do not jive with a FPR. The second you blocked off the return line, you took it out of the equation. This is either a blocked fuel feed line(sock pickup in the tank or fuel filter that I...
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    Crank relearn and cam retard offset question

    Just make sure your CMP is good. You shouldn't need to run another one if you don't have a check engine light on. There is a procedure in this thread that supposedly will let your truck do the crank relearn on it's own. https://www.gmt400.com/threads/case-learn-or-crank-relearn.6423/
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    Also, the return line will be the one not running through the filter.
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    You can rent tools for free from Autozone or Oreillys. That includes compression tester, multimeter, fuel pressure tester, etc.. For battery drain, disconnect the battery cable from the positive terminal and connect a multimeter between the positive terminal and the battery cable. Select...
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    You could also use a c-clamp with a hard piece of wood or plastic on the round side to protect the hose as well
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    https://www.harborfreight.com/4-piece-fluid-line-clamp-set-65116.html?utm_source=google&utm_medium=cpc&utm_campaign=12192885310&campaignid=12192885310&utm_content=115861569726&adsetid=115861569726&product=65116&store=3413&gad_source=1&gclid=Cj0KCQjwir2xBhC_ARIsAMTXk85qZdjuCT3nDWBr9MAOHcSjKtFenWA5...
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    This has no diagnostic value. You have evidence that fuel pressure is not right. Focus on that until you find the culprit. Once you have fully diagnosed that issue, fix that problem and then re-test. Any part you replace that wasn't actually broken is another potential issue being introduced...
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    You will just end up chasing your tail and spend tons of money to potentially solve nothing like that. There have been lots of good advise on how to simply troubleshoot your problem and you seem to completely ignore it and instead laser focus on something that everyone is telling you IS NOT the...
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    Well, that verifies you have a fuel pressure issue.. but doesn't narrow down why. You could have a bad check valve in the pump, leaking injectors, or a bad regulator. If you block off the return line and the fuel pressure builds above 60 PSI and doesn't bleed down anymore, you will have narrowed...
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    6.5 to 454 vortec swap

    Honestly I'm still not 100% sure what is being asked in this thread. The main break for CONTROLLERS on 4l80s is 1994. 91-93 used a different pressure control solenoid and needed to have different controls to use it. Here's a pretty detailed quote I found describing it: "The control system is...
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    6.5 to 454 vortec swap

    97 was a major change. 96 and older has the lubrication circuit that goes out to the cooler and then returns to the front of the trans and then runs through the geartrain to the rear. In 97 and later, the cooler ports are spread front to back and the return goes into the center support. It's...
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    P009D is a fuel pressure relief valve code... an L29 does not have one of those. You will never get such a code for a FPR in an L29. That is a code that will show up on Gen 3 LS motors. The code you have is P00D9... which is an ambient air temp sensor circuit code. Again... test, don't assume...
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    No exhaust means no O2 sensors... which would cause all those codes. If they are there and you don't have any exhaust pipe after the sensors, that will also keep them at basically zero voltage because they will read all the oxygen rushing in from the atmosphere. No code is going to lead to FPR...
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    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    no, it should still run fairly well without the O2 sensors, just on the default safety program instead of actively adjusting to be stoic. That's assuming you don't have any other issues.. which seems to be a poor assumption in this case. It sounds like you might have a power or ground issue in...
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    The Official Vortec 454 Info thread

    It's just a shraeder valve. I've "checked" one in a pinch with a $0.99 tire pressure gauge and then just tossed the gauge afterwards. The FPR is well known to fail as well and then you end up with fuel pressure out of spec and possibly fuel getting sucked into the manifold from the vacuum...
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    Vacuum canister

    I'm still not even sure what he is asking.... What vacuum canister? A pic of what he is talking about might help? We seem to be assuming he is talking about the charcoal canister, but maybe not.

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