5.3

  1. Boiler89

    Moaning noise

    Hi there, New to the 5.3 ecotec. I recently bought a 2018 Yukon XL SLE. I didn’t really notice it when test driving it, but have started to notice a moaning sound on startup and acceleration. Kinda sounds like a power steering pump, but I know it’s not since these things are electric power...
  2. M

    Help please

    Hi I’m new here, just made an account because I cannot figure this issue by myself. I have a 2003 tahoe LS with the 5.3 FLEX FUEL. It wasnt in the best condition but ran a good 10k miles before it crapped itself. The original issue was that it broke down on the highway and when i tried turning...
  3. bigred2015

    5.3 tahoe muffler delete help

    Hey all I have a 2015 tahoe and am looking for a nicer exaust sound but nothing too crazy or expensive. A local shop quoted $300 for a muffler delete and tip install witch seems high. Id like to do the muffler delete myself and either not add a new tip or take it to the shop and see how cheap it...
  4. AWOLASAP

    Head Gasket or Swap

    I have a 2004 Tahoe LT 5.3 FFV with 205k miles. About 8 months ago a tick started, and through a busy work schedule finally eliminated just about everything but the head gaskets. I confirmed this with a test from Blackstone that says I have signs of coolant in the oil. My question is, is it a...
  5. D

    Misfire mystery?

    Hello guys, I am having a misfire on cylinder 5 that I can't seem to get away from at all. The P0305 code is not making a light on the gauge (it's pending) but I can still scan for it and slightly feel it at idle. Vehicle: 2014 Chevy Suburban (Vin "0"). What I tried: Moving the spark plug...
  6. tadv

    Ticking Nightmare on 2001 Tahoe 5.3

    So for the past few weeks me and my dad have been trying to fix a tick that just started on my 2001 Tahoe LT 5.3L. Through all manner of twists and turns we finally managed to replace the lifters and get everything back together and running again, but the tick persists!!! After hearing from a...
  7. J

    5.3 Lifter Help

    I have a new to me 2011 5.3L Yukon. Cam, Lifter & DOD delete was previously done with a "tune". No hard data on what was installed i do know they kit was from BTR. Week after purchase heard a lifter tick - had a shop confirm it was a lifter. I would like to go back to stock cam/lifter with DOD...
  8. L

    2012 Yukon xl 4x4 eating antifreeze?

    Let me start off with the fact that she runs perfectly. She's got the 5.3, no hiccups, no codes, no rough idle, live stream on the scanner shows no reds, etc. I have a generic scanner, but it's able to do almost everything a dealer scanner can do. She's got 275k miles on her and she purrs like...
  9. brice117_

    What to do lol

    So, I just got a 2012 SSV that was used as an offroad vehicle for the police, it has a slight lift and what not, I am wondering what can I do performance wise or wheels and tire wise to an SSV. The reason I say that is because not a lot of people seem to have SSVs (4x4) in the 5.3 If anyone can...
  10. CruelJung

    IAT Always Reads 32°

    Earlier this year, I solved a cold start issue with my 2008 Yukon XL (5.3 LMG) by replacing my ECT sensor. I discovered a few other issues along the way to that fix and one of those issues is that my intake air temperature consistently reads 32°, regardless of environmental conditions or engine...
  11. A

    Idles rough coming to stop

    Just recently purchased a 2011 PPV, ran like crap when I got. So far I have replaced plugs and wires, new air filter and cleaned the throttle body. Runs a whole lot better now but when I am coming to a stop the RPMs drop below 500 and shudders a bit then levels off then the RPMs bounce around...
  12. N

    2007 Yukon 5.3 DOD Delete

    Is it necessary to plug off the oil passages in the oil pan when doing a DOD delete? I had a full DOD delete kit put in (from ams racing) and tuned by a guy who’s local and came out to the truck where it was being worked on. My mechanic said its not necessary but its kind of got me wondering...
  13. ShookieJay

    How to Reset Transmission Control Module?

    Hey guys, sorry for the dumb question, but I've searched the forum several times as well as Google and haven't found an answer. Can anyone tell me how to reset the TCM, hopefully without a scan tool? I just installed a shift kit and corvette servo, as well as replaced the shift accumulators in...
  14. H

    Airbag light and parking brake

    I have a 2005 Yukon XL with the 5.3 in it. I’ve had an airbag issue where the light will come and go, and it is always for code B0044. I recently fixed my parking brake, and as I’ve been using it I’ve begun to notice that a few times i put the parking brake on, my airbag light would go away if...
  15. C

    New to the site and new to me 05 Yukon 5.3

    Just picked up a clean 05 Yukon 5.3 with 120k. But man she is ugly. Way to much chrome and sits way to high in the back. Other than that, I like this truck a lot so I'll probably be the annoying new guy with a million questions.
    • CoalTrain614
    • Thread
    • 2005 5.3 5.3yukon gmt800 lowered suspension loweredyukon
    • Replies: 19
    • Forum: Introduction
  16. ShookieJay

    '03 Tahoe 5.3/4L60/NP246 Swap to 6.0/4L80

    I have an '03 Tahoe with the 5.3 Flex, 4L60E, and NP246 (auto 4wd) transfer case. I have the opportunity to buy a low mileage rusted out truck for parts and I'm wondering how straightforward it would be to swap the drivetrain from the junker into my Tahoe. The donor is an '06 Silverado 2500 HD...
  17. Jeffs5-3

    03 GMC Yukon Totaled

    October 6th 2023 My truck was unfortunately totaled early morning on my way to work by some distracted driver who ran the light going 40mph and didn’t bother looking at the street lights. Street lights were out on the main cross streets so we had to resort to 4 way stop method as it was my turn...
  18. Jeremiah_Yukon02

    2002 GMC Yukon Random Cylinder Misfire (P0300)

    alright guys i just installed new injectors (OEM) and now my truck has a random cylinder misfire (P0300) under hard acceleration and at idle sometimes, I've heard that it could be fixed with a camshaft position sensor relearn but i'm not exactly sure and honestly i don't have the money to throw...
    • Jeremiah_Yukon02
    • Thread
    • 02 5.3l flex fuel 5.3 engine idle engine load gmt800 help i need help please mechanical random misfire
    • Replies: 8
    • Forum: Engine & Drivetrain
  19. Dustin Jackson

    2008 chevy tahoe Bad negative battery cable

    This is a video taken a few years ago when my tahoe wouldn't start, the solution ended up being to replace the negative battery cable then the problem never happened again. A good test is to grab the negative battery cable and jerk it around, if the Tahoe starts after that you'll know you found...
  20. ShookieJay

    Coolant Reservoir Level Sensor

    The past couple days I've been getting a low coolant message when I start my '03 Tahoe. The level in the reservoir is good and temp has been normal. Assuming the sensor is going bad. My question is, can the sensor be replaced or is it molded into the reservoir? I searched online for the sensor...
  21. S

    2015 Tahoe PPV Cyl 7 Intermittent Misfire

    Hello everyone, I’m new to the forums, my names Shawn and I own a 2015 Tahoe with the l83. I’ve had a cylinder 7 intermittent misfire for some time now and I can’t seem to figure out what the issue is. Here is the list of items I have changed/fixed. Fuel pressure is good, injector balance is...
  22. P

    2002 Yukon/Another knock sensor thread

    I've been reading knock sensor posts and watching videos for 3 days and I'm really in need of some direction. I have a 2002 Yukon with a 5.3. It was throwing a knock sensor code. It was only one but I don't remember which. I watched some videos and ordered two new sensors and a new harness...
  23. S

    a few mis-fires during drive cycle?

    2011 Chevy Tahoe 5.3 4x4 I recently bought this vehicle 97k miles I went ahead and did new ac Delco spark plugs, intake manifold gasket, both exhaust manifold gaskets, both valve cover gaskets, all 4 oxygen sensors, ring gasket driver side exhaust to cat, donut gasket for passenger side exhaust...
  24. E

    2005 Yukon XL 5.3 L59 to LM7

    We have a 2005 Yukon XL with 212,000 miles. It’s a western car so no rust. Lifter started making noise a week or so ago, mechanic thinks the roller isn’t spinning this scratching the cam shaft. Instead of doing a top end job, I’m thinking about a engine with less miles. Around me I can’t find...
  25. G

    Oil issue

    Hey guys I got a 2005 LS Tahoe 5.3, the oil was changed I’d say close to a month ago and I remember looking under it and saw a little oil droplet just where the drain plug was about a week later after I changed it. I looked under it yesterday and I see this. How is the oil making its way through...

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