5.3l

  1. M

    2023 Suburban Premier 5.3L 4WD - Observations and Questions

    I'm new to the forum and would appreciate any and all ideas or suggestions. Just took delivery of a 2023 Suburban Premier 5.3L (4WD) with 12,000 miles on it. Bought it from Carvana (my first internet vehicle purchase) and overall the experience has been positive. I have 7 days to return the...
  2. S

    REDUCED ENGINE POWER. Read below and please help me understand this.

    How do I check CAN BUS on my 2005 z71 Tahoe. I understand how to do it through a 16 pin OBD2 port but have no idea how to do it on my Tahoe due to it only having 4 pins in the OBD2 port. Ima supa confused. It has two grounds, data wire, and power wire or voltage wire. Any help on this is much...
    • stretchit
    • Thread
    • 2005 tahoe 5.3l no throttle response p0120 p1125 p2120 p2125 pedal adjuster pedal positon sensor reduced engine power
    • Replies: 45
    • Forum: Engine & Drivetrain
  3. Z

    2004 Yukon XL whistle with belt off

    Hi Ive had a problem with my yukon xl with the 5.3L Vortec. It has been making a very high pitched whistle sound that matches rpms. I have replaced the alternator, ac tensioner pulley, and the ac belt. It also makes the sound with the serpentine belt off. I have also sprayed brake cleaner around...
  4. jayburn22

    New Here w/ an '01 Tahoe 5.3L

    Hello and hope everyone is having a great year so far! Pops gave me his '01 Tahoe a few months back after my '01 Blazers transmission blew @ 310K. Luckily my father is a true Hoss and found himself an '09 Escalade to keep himself busy. We got the '01 Tahoe off a work buddy about 16 years ago...
  5. G

    Need some help! P0606

    Hey everyone! Just bought myself a 2012 Chevy Tahoe ppv 5.3l with 75k miles on it about a month ago. Drove it from Miami to Greenville sc with not a single problem but within the last week(about 1200 miles later) I’m randomly getting “reduced engine power” with no throttle repose at all. I’ve...
  6. S

    Intake Manifold Gasket Failure Symptoms

    So for the Last year or so I have been desperately trying to solve a fume intrusion into the passenger cabin that was making me sick every time I drove the car: headache, coughing, eventually fluid buildup in lungs, eye irritation, dizziness, metallic taste in mouth/lungs, was like a severe...
  7. Jeffs5-3

    03 GMC Yukon P0300 misfire 5.3

    Hello everyone I have an 03 Yukon with 5.3l L59 171k miles on it and it’s been a love hate relationship with the truck tbh. I have a dreaded misfire that’s just been kicking my ass and i want to address it because I want a reliable daily. I bought the truck about 2 months ago the truck had given...
  8. A

    P0300 random misfire

    Hello. I am having issues with a 2005 Tahoe 5.3. The truck starts and runs fine for a few minutes and then out of the blue it will throw p0300 and randomly misfire. The truck will misfire for a few minutes and then run perfectly fine after. If I watch the misfires I’m live data when this occurs...
  9. JPVortex

    2005 Tahoe Ticking

    Hello, just tonight while taking pictures of my Tahoe I noticed this ticking it's making. It's worrying me a bit, but I don't think it's rod knock at all. It almost sounds like it could be an exhaust manifold leak, or at worst a lifter problem. The sound is only heard at idle and as soon as I...
  10. J

    04 Tahoe engine help

    So my 04 Tahoe may have blown her engine. I found another 5.3L however it belonged to a 04 Yukon. Can that engine fit into the engine compartment of my Tahoe?
  11. B

    Performance/Economy Issues

    Hi everyone, first post and hoping to get some information with more knowledgeable who know our vehicles. I have a 07 Yukon with the LMG 5.3 that recently had the cats stolen after I had a blowout and had to let it stay on the highway overnight. I got a local shop to just weld in some metal...
  12. Dustin Jackson

    AFM Delete Double Checking

    Hello Guys I am in the process of ordering all the parts I will need in order to complete my AFM delete on my 08 5.3 but I have questions about the oil pump and pressure relief valve situation. Here is a list of the parts I have ordered so far: LS2 Lifter Trays LS2 Chain Dampener (Recommend...
  13. K

    Bought a '03 Tahoe LT with 235k miles for $2k, time to fix it up!

    I'm new here. This is actually my first post. I bought a 2003 Tahoe LT 4dr listed for $2,000, but it has some issues that need to be addressed. I'm going to list the things I know to be wrong with it, talk about what I do to fix it and post images along the way. I have experience working on...
  14. M

    2006 Tahoe Cooling system running to cool. 5.3L Flex

    I got a 2006 Tahoe 5.3L flex that needed an engine. found a remanufactured (z code engine) had installed with new water pump, radiator and thermostat ( have replaced 3 times wit factory 178 degree stat). Now the engine runs about 165 to 175 on the road. When idling it will get up to about 210...
  15. Streetlegal42

    2007 Tahoe/Engine swap help

    My Tahoe is the 07 with the LMG Flex fuel engine, found a LY5 with low miles and I was wandering if I could use it if I used my intake, wiring harness and components from my old engine. Thanks
  16. 3BigDogs

    Starter/solenoid for 00 Tahoe 5.3l Vortec

    So now my starter/solenoid needs replacing as of this morning! Is my 2000 Tahoe LS 5.3l Vortec comparable with any other vehicle as far as this goes? Am I better off with new vs rebuilt? I need the most inexpensive way to go..I just moved into a rental house Xmas day..yay!! But now have all...
  17. Tahoe97

    Blue smoke on cold start and excessive oil consumption 2005 Tahoe

    We just completed a round trip drive between NC and FL running 10 straight hours in both directions at 75mph+ in our 2005 Tahoe (5.3L) . We have 270,000+ miles on the engine and it still runs great but historically uses more oil than normal. No oil leaks anywhere. Before the 1st 700 mile...
  18. E

    2001 Yukon slt 5.3l won’t start after front end collision. Has spark, fuel and power at injectors

    The truck will crank just fine, can hear fuel pump when truck turned to on, has 55psi when cranked and 51 when not cranking. Also checked to see if there is spark and there is as well as when started fluid or gas is manually sprayed in the engine starts and stays running until you stop manually...
  19. O

    2004 GMC Yukon - Suspension and Engine Rebuild Help!

    Hi guys, I have a 2004 GMC Yukon with 275k+ original miles. I am looking to replace the front and rear suspension components. I have been looking at the Bilstein Shocks for my truck and I have heard positive reviews. What do you guys suggest I should be getting for both the front and rear...
  20. M

    01 tahoe 5.3 performance and fuel economy

    Hey guys! New to the forum, but not new to the gmt800. Had a 2000 Sierra 5 years ago, and it was a good truck but it got fairly rusted so I sold it. After a while I needed another truck so I bought an 01 tahoe 4x4 that was mildly lifted with a hair over 200k. I’ve been taking this truck on road...

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