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Hey guys, new to this forum. Recently purchased one of the dream trucks of mine, 2014 Sierra Z71 4x4 5.3l. Which I was finally able to afford lol, bought from a local dealer with 88k miles.
Prior to purchasing I test drove it, checked the history and maintenance records from GMC. All seemed well, purchased it and few days later while driving home on the highway cruising about 60-70mph, I began noticing a really loud sudden vibration that would come and go every few minutes (feels like it’s coming from underneath the truck not sure), lasting about 5 seconds. Even around 20-30mph I notice some shaking. Seems to be shifting fine, drives pretty smooth other than these vibrations that are coming and going. I just don’t know what it could be. I didn’t notice it during the test drive, just my luck, hoping for the best. Any opinions are greatly appreciated, I attached a video as well of the sound.
By Andy Brown
I apologize for the novel, but here we go!
Alright, so 2011 Tahoe 5.3 LMG Flex vin 0, 158k miles, never given me any issues ever before.
Drove it up on ramps last night to get under it to just check everything before I tow a trailer over the weekend. All fine and dandy.
Go to start it to back off of the ramps-dash and running lighter all turn on. Turn the key to ignition and....nothing. If I try to remote start it, I just get an electronic noise.
Took the starter off last night and tested it multiple times at my work (advance auto) and my starter was super dead. Sweet, found my issue, right? Got a new starter. Put it on. Still no crank. No click. No nothing except everything else on the truck acts like it normally would when you turn the key.
I checked connection between the positive terminal on battery and the starter with a multimeter -just fine.
My battery is perfectly fine. Tested it multiple times now. Have a charger. Made sure it's fully charged. Double and triple checked.
Looked at all the applicable fuses I can think ofand swapped the starter relay with the ac relay (they are identical) and it changed nothing.
This then led me to believe maybe the ignition switch in the steering column was bad. Put a new one in today. Same exact issue. It changed absolutely nothing. Everything turns on but no crank and no relay sounds or anything.
Almost thinking that something isn't sending the signal to the little wire connector that is on the starter selenoid (attached to the starter). But I feel like I've checked everything that could block that.
I'm running out of ideas and I NEED (super awesome timing!) this truck to move from Lincoln to Omaha starting tomorrow 😕 ugh
Was wondering if putting 12v constant to that little plug wire on the starter solenoid may skip whatever is not sending the signal, which I guess would just confirm that there's no signal. I dunno. 8+hours into this so far. First time this truck has ever given me issues in 158k miles.
Also, no, it will not start in neutral.
Any tips would be awesome!
I have a grant steering wheel assembly, but I need more insight on how to install. Watched a bunch of videos but couldn't find a good one for what I doing.
By Charles P.
I just got a 2017 Sierra SLT over the weekend with a 6.2l engine and 8-Speed Tranny. 85,000 Miles
The previous owner had done the following that I can tell from Carfax and looking around:
-MBRP Full Exhaust system
-Catch can setup
-Heads taken off and gaskets replaced (Per carfax)
-Differential Fluid changed
-Differential Cover changed
I am trying to read up on everything about it and I had some questions that may be obvious or simple but I am having a hard time finding the answers to.
1.Im not entirely sure if the truck has a tune or not.Is there a good way to tell?
2.Would a custom tune disable AFM?
3.Do I empty the Catch can often?
4.Should I do the TSB 8 Speed fluid change at its current miles? Or is it too late?
5.Any advice/ info to a new 6.2l anyone has? Im wanting to know as much as I can.
I am looking for this truck to be a 15 year truck. So maintenance and must do's are very important to me.
Thanks for any help!
Greetings. New guy here, so please freely call me out an any forum missteps.
I started out with a base model 2018 GMC Sierra 4wd, regular cab, standard bed. It has a snow plow package and 3.42 gears. Onyx Black. No frills. I'll try and remember the order in which I did everything. All work do date has been done in my driveway, which I'm reasonably proud of because I work a job where I mostly send emails and sit in meetings.
-- Debadging happened the first day of ownership... just my thing, costs nothing.
-- Blacked out my front badge with with plasti dip
-- Removed the air dam
-- Cover King carpeted dash mat added, in the color of 'wine'.
-- Cover King saddle blanket seat covers added in wine/whiteish.... returned after about a month because they were coming apart at the seams in a quite literal sense. Back to my grey cloth seats.
-- Added a Rough Country 2 inch level (those cheap spacer things that are shaped like 'C'
-- Brow tint on the windshield and multiple layers of Collinite way done by Motoring Images in Lee NH (ok, this wasn't in my driveway)
-- Airaid modular intake and filter added. Sounds great, I'm a fan.
-- Borla ATAK cat back system with polished tips. Sounds wonderful.
-- Diablo Intune3 handheld tuner, custom (non dyno, remote) tuned further for 91+ and some extra oomph by Lew.
-- Mudflaps installed and ultimately removed because they were the no drill kind and drilling would have helped from losing one in a carwash or who knows where, so those are gone.
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