Jump to content

2014 5.3 Motor Blown??

ThatSierraOwner
 Share

Recommended Posts

ThatSierraOwner New Member

ThatSierraOwner

Posted
Posted (edited)

Hello all. I’m looking for some help/advice. My truck has been a nightmare. 

 

Original issue: Started running rough, visible rpm fluctuation, shifting and downshifting very hard. Originally thought the torque converter was going out again. Codes were P050D, and P0308 which is misfire on cylinder 8. Had dealer replace fuel injector bank on passenger side. 
 

Picked it back up. Started driving to work and noticed raw fuel smell as-well as a pulsing/pushing air noise. No codes. Ended being a broken pcv tube off the intake manifold. 
 

Picked it back up. Same raw fuel smell as before. This time the SES light and P0304 is on. Outer spark plug ceramic was cracked and plug wire shorted. New plug and coil wire were installed. 
 

Again still noticing smell at stops. Cylinder 4 misfire light comes on. Checked compression cylinder 4 had 110. All other cylinders on that bank were around 210. Rockers and valves all good, piston is burnt with scarred cylinder. 
 

Dealership has been good to work with and always provide answers to my questions. 
 

I’m looking for insight on what might have happened to my motor, and suggestions on what to do next… rebuild? Motor swap? Etc

 

Thanks

Edited by ThatSierraOwner
Snowcamo Senior Enthusiast

Snowcamo

Posted
Posted

Replace the plug wires and ignition coils.  I bet you just have a few cylinders with a mild miss fire that is not showing. Been there. 

ThatSierraOwner New Member

ThatSierraOwner

Posted
  • Author
Posted
2 hours ago, Snowcamo said:

Replace the plug wires and ignition coils.  I bet you just have a few cylinders with a mild miss fire that is not showing. Been there. 

Already replaced. Compression is still low.

Snowcamo Senior Enthusiast

Snowcamo

Posted
Posted

Ya i missed the low comp.  It's time for a rebuild unless a valve is not sealing even then ya may as well just rebuild or 6.2 it😁

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,778
    Total Members
    8,960
    Most Online
    daveishi
    Newest Member
    daveishi
    Joined

  • Who's Online   1 Member, 0 Anonymous, 894 Guests (See full list)

  • Latest Articles

  • Posts

    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      Because that is IDIOTIC, much like this question. They've already been forced to do it by past administrations - why would you roll that back when it's a GOOD thing?  WHO IS ARGUING FOR LOWER MILEAGE???? 😂  NOBODY IS!!   I'm certainly not! What I want is RELIABLE vehicles again that are worth the price paid!    I don't get your logic here ...   In 2003 I paid $2,200 for our '86 Grand Marquis. It's STILL running and I've never been inside the engine, aside for the timing cover since it was leaking, so I threw a new timing set in since that makes sense. Transmission is ORIGINAL. Electric pump in the gas tank is ORIGINAL. Rear end is ORIGINAL. I'd have to hit my head REAL hard to want to pay $60k or more for a car that still can't come close to the comfort, seating and storage space, or reliability of this one. Nothing is even in the ball park! Hundreds of thousands of brands and models have been built and sent to the crusher while this one keeps on going!   https://postimg.cc/Z9XRrCSg   I've got a whole fleet of cars, motorcycles, and a truck close to this age for summer and winter. No one could pay me enough to buy anything built this century. I have zero use for any it.
    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      Since I'm the one who has to fix them when they break, I'll take vehicles over 30 years old all day, EVERY day, over ANY modern crap. Have you attempted any repairs on anything built after 2006? It's a friggin nightmare, and gets worse the newer the model year.    If I had the will or desire, I can make any car of any age outside of a Model T (I don't have THAT much will ...) just as powerful, comfortable, and have all the tech the new stuff does, and get pretty close in mileage, too. I prefer SIMPLICITY. The less the vehicle has, the less to fix WHEN it breaks, not IF.   I'm glad you snot-nosed punks don't like them. More for us, plus that keeps the prices from climbing more than they already have.👍
    • cautious optimist
      2027 GMC Sierra: Official Discussion

      By cautious optimist · Posted

      Bringing this thread back on topic. I just noticed the incredible lack of bright chrome across the entire new lineup. Even the Denali has tinted the brightwork in the grille and has none elsewhere. None of them have chrome bumpers. As far as I can tell there aren't even chrome mirror caps. I'm curious if this also happens out back? Are there no chrome rear bumpers either? This is quite the departure for GMC.
    • cautious optimist
      2027 GMC Sierra: Official Discussion

      By cautious optimist · Posted

      Bringing this thread back on topic. I just noticed the incredible lack of bright chrome across the entire new lineup. Even the Denali has tinted the brightwork in the grille and has none elsewhere. None of them have chrome bumpers. As far as I can tell there aren't even chrome mirror caps. I'm curious if this also happens out back? Are there no chrome rear bumpers either? This is quite the departure for GMC.
    • cautious optimist
      2027 GMC Sierra: Official Discussion

      By cautious optimist · Posted

      Bringing this thread back on topic. I just noticed the incredible lack of bright chrome across the entire new lineup. Even the Denali has tinted the brightwork in the grille and has none elsewhere. None of them have chrome bumpers. As far as I can tell there aren't even chrome mirror caps. I'm curious if this also happens out back? Are there no chrome rear bumpers either? This is quite the departure for GMC.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...