Jump to content

Valve noise

Stocklook

By Stocklook
in Ask A GM Technician

Recommended Posts

Stocklook Enthusiast

Stocklook

Posted
Posted

I'm getting the normal GM valve noise only on hot normal engine temps at idle, does anybody know what this is or have a fix, it started at 16k and GM said this is normal, if so how come it didn't do it at first

 

04 silverado LS ECSB 4.8

Stocklook Enthusiast

Stocklook

Posted
  • Author
Posted

Nobody !

 

I guess i'm on my own, I have an appt on Monday with the dealer, I had to see the service manager first before they would look at it, they said he has to look at all engine noise complants before the bring them in.

 

it's like a ticking with some cladder, it's intermittent not constant. the strange thing is it sounds louder at about 10 ft away.

 

other than this, the truck runs great, no piston slap, or valve cladder on heavy accelleration.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

Maybe it was your question. What's "the normal GM valve noise" ?? If it's normal, then there is no help to give, though our engines don't normally have valve noise.

 

So, how does one answer that question? Noises are hard to diagnose when you're standing right there listening to them, let alone trying to diagnose them over the internet based on someone's thinking of where the noise originates.

Stocklook Enthusiast

Stocklook

Posted
  • Author
Posted

I know noises are hard to diagnose but this is not like the normal GM tick, you can only here it at idle when the eng is hot, and it will do it about every few sec every time at idle, with A/C on or off it will still do it.

 

I was just checking to see if any body else had this noise. and if the dealers told them it was (normal)

 

They are looking at it on monday so I guess they changed the "gm normal" to will look at it and see

Stocklook Enthusiast

Stocklook

Posted
  • Author
Posted

Well nothing is wrong with the truck, I Guess I will have to live with it,

 

Allthough It's cool to have a gas 1/2 ton truck that sounds like a duramax.

Stocklook Enthusiast

Stocklook

Posted
  • Author
Posted

Update:

 

There was a GM engineer looking at Monte carlo, so he looked at my truck and said the noise was coming from the valve train, cam area, more so on the drivers side.

it's more noticeable when not under a load (in park)

He is going to reserch it and call the dealership as to what to do next

  • 2 weeks later...
Stocklook Enthusiast

Stocklook

Posted
  • Author
Posted

Update:

 

Cam and lifters going in on monday. :driving::P Maybe this will fix the noise

 

OK, What is involved in replacing these parts on a vortec, and what parts will they replace, clean, reflash comp etc. The Dealer will be doing the work.

 

04 4.8

  • 2 weeks later...

Archived

This topic is now archived and is closed to further replies.

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

    342,840
    Total Members
    8,960
    Most Online
    appletrav
    Newest Member
    appletrav
    Joined

  • Who's Online   4 Members, 0 Anonymous, 352 Guests (See full list)

  • Latest Articles

  • Posts

    • newdude
      2 speed transfer case optional now?

      By newdude · Posted

      This is a 1/2 ton thing ONLY.  All HDs 2020-2026 have the two speed transfer case, with Autotrac as an option.     1/2 tons 2019-2026, regular 4x4s come with a single speed case (no 4LO!), and trucks with Z71 ordered, or all Trail Boss trucks come with the 2 speed case.  2 speed case is also an option on WT, and is also standard on High Country.  
    • newdude
      Different requirements for oil filters?

      By newdude · Posted

      2013 5.3 still to this day calls for the PF48 filter.  Which as a 15psi bypass pressure.     There is a TSB, 17-NA-157 that talks about the PF-63 and PF-64 filters which have a higher bypass rating of 22psi.    TSB HERE - temp.xml   "Beginning in 2012, the oil pumps began to regulate main gallery feedback instead of pump out pressure. This means that the oil pump now does not begin to regulate until pressure is built up to the main gallery. This change reduces the amount of time it takes to provide oil to the engine bearing and lifters during extreme cold start conditions.  Main gallery feedback oil pump control systems are present on the following engine families which use Spin-on oil filters: Small Gas Engine (SGE), Large Gas Engine (LGE), High Feature (HFV6) Gen2 and Small Block Gen5 gasoline engines. These engines with the main gallery feedback oil pump control systems are factory built with an ACDelco® oil filters"   It also calls out what engines use those filters.  The gen 4 small blocks were not on that list (LMG, LC9, L9H, L92, L94, L20, L96).  Gen 5 small blocks use the higher pressure filter.          That all said...   Your 7045 Napa filter is the PF63 equivalent, with 22psi bypass.  You are already using the higher bypass pressure filter.  You CAN keep using it, you don't technically have to use it though.  
    • Grumpy Bear
      Different requirements for oil filters?

      By Grumpy Bear · Posted

      Do you know WHY the filter relief setting was increased to 22 psig?    When the new system goes into the second stage the pump volume ramps up considerably. It was found that the 15 psi filter bypass setting put the filter in bypass on a warm engine when the second stage was activated. Raising the filter bypass setting forced the filter to do what it designed to do. Filter. Preventing debris from circulating during high load, high rpm operation.    So next question is how did GM find this out? VLOM/lifter failures and a deep dive by Melling Corp.    Last question. Is it required? Look at it like this; a motor may be equipped with a rev limiter. But it only works if the set point in reached. That 22 psig setting only matters if the pressure differential across the filter media exceeds 15 psig during normal warm operation. Second stage kicks in around 3000-3500 rpm.    I can't answer your question because I don't know you and how you use the truck. But I think there is enough information here to let you decide for yourself. 😉
    • Coastie05
      give me some tips to make my truck look better

      By Coastie05 · Posted

      Go back to OEM wheels. 
    • newdude
      2020 Trailboss 6.2 replacement

      By newdude · Posted

      Probably not their first rodeo, so it should go as planned most likely.  Typically the service manager or tech doing the swap will put some seat time to shake it down after they get it all put back together.  We usually put 50-100mi before we hand them back so if something happens, its not after you get it.  A coolant leaks, oil leaks, a ground left off or loose, vibration, etc.     The new engines so far have been good?  There's been a couple that have popped out there again (the replacement engine) but most have been okay.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...