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Irregular tick at cold start

Bigmoore

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Bigmoore Enthusiast

Bigmoore

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Hi all. I have a 2018 Sierra 1500 with the 5.3. The other day, I heard this abnormal, non-rhythmic tick during cold start. I haven’t heard it when it is warm. Link to video:

 

Anyone have any idea what could be causing this? Or is this normal?

 

 

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Paintor Enthusiast

Paintor

Posted
Posted

You have a collapsible lifter for V4 mode that is NOT PUMPING UP. CAM damage is happening.

 

there is a filter on the V4 hydraulic switching module inside the intake..being 2018 I doubt it is it being plugged.

 

Get some Slick50 Synthetic Oil additive NOW and dump half of it in the valve cover.

 

Does your VIN start with a 3? Start making plans for alternative means of getting around.

 

Sure...GM will cover it under warranty. ?

 

Backup plan, Uhaul rents Silverado’s and you can have a Mehican swap motors in 30 minutes flat.

Bigmoore Enthusiast

Bigmoore

Posted
  • Author
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You have a collapsible lifter for V4 mode that is NOT PUMPING UP. CAM damage is happening.
 
there is a filter on the V4 hydraulic switching module inside the intake..being 2018 I doubt it is it being plugged.
 
Get some Slick50 Synthetic Oil additive NOW and dump half of it in the valve cover.
 
Does your VIN start with a 3? Start making plans for alternative means of getting around.
 
Sure...GM will cover it under warranty. [emoji28]
 
Backup plan, Uhaul rents Silverado’s and you can have a Mehican swap motors in 30 minutes flat.

I just turned over 20k miles. It sure does. Made in Mexico. Is there a manufacturing issue with the ones built down there?


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Donstar Senior Enthusiast

Donstar

Posted
Posted
54 minutes ago, Bigmoore said:


I just turned over 20k miles. It sure does. Made in Mexico. Is there a manufacturing issue with the ones built down there?


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No, your issue has nothing to do with where your truck was assembled!   Take it to your dealership for warranty.  Most dealerships will probably tell you "it's normal" on you first visit.  Be persistent. and take it back often and/or call GM support for assistance.  Have the service advisor document your concerns and visits.   Remember, the service writer is doing his/her job and in many cases just following a prescribed script.  Always be polite or s/he will switch to their "dealing with hostile customers script" and you'll get nowhere.  You have lots of warranty left on your powertrain so take your time and get it fixed properly.   

Bigmoore Enthusiast

Bigmoore

Posted
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No, your issue has nothing to do with where your truck was assembled!   Take it to your dealership for warranty.  Most dealerships will probably tell you "it's normal" on you first visit.  Be persistent. and take it back often and/or call GM support for assistance.  Have the service advisor document your concerns and visits.   Remember, the service writer is doing his/her job and in many cases just following a prescribed script.  Always be polite or s/he will switch to their "dealing with hostile customers script" and you'll get nowhere.  You have lots of warranty left on your powertrain so take your time and get it fixed properly.   

Is this something that has been happening on a lot of the 5.3s? I had a 2014 with 40k on it and it didn’t have this issue. Are there any service bulletins out there for the issue yet? How concerned should I be with driving it until it gets fixed?


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Lsgun1 Enthusiast

Lsgun1

Posted
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It likely won't just grenade but it'll start having misfires and run poor.  Only thing you can do it take it in for a visit and hope they just go ahead and fix it now vs waiting for more internal damage.

Donstar Senior Enthusiast

Donstar

Posted
Posted
24 minutes ago, Bigmoore said:


Is this something that has been happening on a lot of the 5.3s? I had a 2014 with 40k on it and it didn’t have this issue. Are there any service bulletins out there for the issue yet? How concerned should I be with driving it until it gets fixed?
 

My '09 5.3 was terrible for the first two years.  It may or may not have been a similar issue as yours but I learned the value of keeping the service advisor on your side!  Once it was fixed, it worked beautifully for another 100k!  My '15,  albeit a 4.3,  is whisper quiet and runs flawlessly.

Bigmoore Enthusiast

Bigmoore

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It likely won't just grenade but it'll start having misfires and run poor.  Only thing you can do it take it in for a visit and hope they just go ahead and fix it now vs waiting for more internal damage.

Got an appointment with the dealer and sent them the video of the tick. Hopefully they can hear it.


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garagerog Enthusiast

garagerog

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Agree with getting it to the dealer, but you could also try getting a mechanic's stethoscope to narrow down the noise and be better informed when presenting details to said dealer. Since the noise is only present when the engine is cold and not after it's warmed up, it's possible it's not a collapsed lifter since I would think it would be noisy all the time, you might be lucky and just have a noisy fuel injector.

Bigmoore Enthusiast

Bigmoore

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Agree with getting it to the dealer, but you could also try getting a mechanic's stethoscope to narrow down the noise and be better informed when presenting details to said dealer. Since the noise is only present when the engine is cold and not after it's warmed up, it's possible it's not a collapsed lifter since I would think it would be noisy all the time, you might be lucky and just have a noisy fuel injector.

That’s my thoughts as well. I have a 2019 Mustang GT with the 5.0L and it actually has the exact tick that my truck has. Goes away when it is cool. Ford deemed it as normal, so I am curious to see if GM can find anything wrong.


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Bigmoore Enthusiast

Bigmoore

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Agree with getting it to the dealer, but you could also try getting a mechanic's stethoscope to narrow down the noise and be better informed when presenting details to said dealer. Since the noise is only present when the engine is cold and not after it's warmed up, it's possible it's not a collapsed lifter since I would think it would be noisy all the time, you might be lucky and just have a noisy fuel injector.

So I just heard from the dealer. They said it was the vacuum pump. They replaced it and said the tick went away. Going to pick it up after work. Hopefully that was the fix.


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tndeerhunter125 Enthusiast

tndeerhunter125

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I’m hopeful that it is the vacuum pump ! Mine has been doing the same exact thing on and off recently and after a bunch of research I’ve narrowed it down to the vacuum pump also. 

Bigmoore Enthusiast

Bigmoore

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I’m hopeful that it is the vacuum pump ! Mine has been doing the same exact thing on and off recently and after a bunch of research I’ve narrowed it down to the vacuum pump also. 

I’ll keep you posted. Hoping that’s it


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Bigmoore Enthusiast

Bigmoore

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I’m hopeful that it is the vacuum pump ! Mine has been doing the same exact thing on and off recently and after a bunch of research I’ve narrowed it down to the vacuum pump also. 

So it’s definitely more quiet. It was already a little warm when I got it back. I will take a video in the morning when it’s fully cold and post it. baddbacac3df0c5ed468a83bc7bbe8f6.jpg


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