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  1. Vortec 5300 5.3L V8
    so I just bought a fuel pressure test gauge to check my fuel pressure and when I turn the key over a couple of times the fuel pressure is at 70-75 psi which I know these trucks usually are around 55 psi and when I crank the truck it will jump to 80-90 fluctuating back and forth turn the truck...
  2. Vortec 5300 5.3L V8
    I got a 2008 Chevrolet Silverado 5.3 just started running rough as of yesterday not sure why no codes what so ever I’ve taken pictures of live data if anyone could tell me what I’m looking at that will be very helpful thanks
  3. Vortec 5300 5.3L V8
    I got a 2008 Chevrolet Silverado 5.3 flex fuel in the mornings the truck starts right up no hesitation But once the truck gets warm and I turn it off and let it sit for a minute it will just crank and crank until eventually it will start and die then I turn it over again and it will eventually...
  4. Vortec 5300 5.3L V8
    (oil pressure at running temp is about 20ish psi) I got the p0521 code the other day, and I replaced the oil pressure sensor and the little filter. I cleared the code and everything was fine for the next day or so. then the check engine light came back on same code! I'm wondering what else it...
  5. Member Introductions
    Hey I'm Richard, am 21, had an account here in 2019 that I've lost. Rejoined the forum because I picked up a new project. I'm the first generation of Chevy man in my family, my best friend got me into them because his dad's LBZ inspired us. Reuploading some pics of my 5.3 and some new ones I...
  6. Engine
    Good morning, I'm hoping for some help from people with far more knowledge than I have on this subject. I have a 2000 GMC Sierra 1500 4x4 with a LR4 4.8 with 243,000 miles on her. The truck was my dads and when he passed I got it. One for the sentimental value and two because I love that body...
  7. EcoTec 5.3L V8
    Hello, to preface this, I am talking about my father's truck. In about a year he wants to install a supercharger into a Silverado 1500 2017 and he wants to make it a sleeper as well, he doesn't want anything shown at all. This is to start asking and wondering a couple of things. First, what...
  8. Vortec 5300 5.3L V8
    Hey guys I’m new here and hoping I can get some solid help from those that have gone before me. I have an 07 Sierra nbs 5.3 and I just had to do a rebuild for the dreaded lifter problem. I went with a full rebuild and head work along with TSP DOD delete kit and stage 2 low lift truck cam; all...
  9. Vortec 5300 5.3L V8
    So I just purchased a low mile LY6 6.0 to drop in my 2012 GMC Sierra and was wondering what all I will need to complete the swap. I’m currently running a miled out 5.3 vortec with the dreaded afm/dod and vvt. Will it be a direct swap? Will I need to mess with any vvt? Please help! Thanks guys.
  10. Vortec 5300 5.3L V8
    Recently replaced my coolant temp sensor and radiator hose adaptor because it broke off and leaked out all my coolant. Now my truck doesn’t blow hot air and says low coolant even though the coolant is filled up. Any help with a diagnosis? Head gasket? Air in the system?
  11. Vortec 5300 5.3L V8
    Hey yall, I'm trying to fix my dads old truck up for him. It's a '00 Silverado with the 5.3 in it. I don't think that it has ran since 2009. As it sits now all i know is that the fuel pump isn't working and i know some of the break calipers were seized up. Im planning on changing the fuel...
  12. Vortec 5300 5.3L V8
    What can I install next for small gains I already have a cam, headers, intake, exhaust and tune done. I’m just trying to see what I can buy next to add power? Not looking for any supercharger
  13. Vortec 5300 5.3L V8
    I have a 2008 5.3 Chevy Silverado flex fuel has a code po300 and check engine light only blinks when it’s in park and when it’s put into a gear the Rpms drop low and the whole truck will shake and rpms will bounce up and down but the truck doesn’t act like it has any loss in power just doesn’t...
  14. Vortec 5300 5.3L V8
    2008 5.3 flex fuel Chevrolet Silverado po300 hooked up to computer misses only when idling it misses on 1-4-6-7 but once I drive it stops missing and check engine light goes away I’ve put a fuel pressure regulator,fuel pump,spark plugs,maf sensor and nothing has helped I also done a fuel...
  15. Performance Tuning
    I’ve finally moved over to forums because I see more accurate and detailed responses. I’ve never posted on a forum sorry if I don’t respond right away. I just have a couple questions. I’m looking to add a little bit more parts and I’m not trying to buy a supercharger or anything but my stupid...
  16. Vortec 5300 5.3L V8
    Hi! I drive a 2004 GMC Sierra 1500 4x4 5.3. Yesterday, I cleaned my k&n air filter as I bought the truck with it and it was pretty grimey and nasty. Bought the specific kit to clean with the degreaser and spray oil. Figured while I was at it I’d buy a can of maf sensor cleaner. Cleaned my maf...
  17. 4-Speed Automatic Transmission
    2000 Silverado with 5.3L . Transmission seems to operate normally most of the time around town. However, the passing gear doesn`t seem to be quite right. If I`m on the interstate in OD and push down the pedal for it to downshift for a little more power it just continues in OD (almost bogs)...
  18. EcoTec 5.3L V8
    Originally wanted to do a cold air intake (CAI) but after doing some reserch I found that just changing the modular intake tube (MIT) you can yeild the same results if not better. Let me expalin First off if you do a full CAI, you get a new MIT with it, which pretty much is the same one if you...
  19. Vortec 5300 5.3L V8
    I helped my neighbor change the oil pressure sensor and screen on his 2010 Silverado 5.3L. This is my first time working on an LS family engine. It was a real pain because the tab to release the plug was facing the intake. I spent a lot of time laying across the top of the engine bay. I...
  20. Vortec 5300 5.3L V8
    Can I find which 5.3 this vehicle has? 2GCEK13TX5123 - - - -
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