Lifters replacement

[demarco39730]

My mechanic told me that I need lifters in my 2011 GMC Yukon with almost 300,000 miles on it
I usually order my own parts from off eBay so my question is how do I choose my lifters it has a 5.3 engine in it I originally bought this vehicle to flip it but since my son doesn't have a vehicle I was thinking about fixing it and giving it to him and do they come with valve springs he suggested some type of kit really confused on this any suggestions

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[swathdiver]

My mechanic told me that I need lifters in my 2011 GMC Yukon with almost 300,000 miles on it
I usually order my own parts from off eBay so my question is how do I choose my lifters it has a 5.3 engine in it I originally bought this vehicle to flip it but since my son doesn't have a vehicle I was thinking about fixing it and giving it to him and do they come with valve springs he suggested some type of kit really confused on this any suggestions

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Well, is this a 5.3 or a Denali with a 6.2? Does the engine still have AFM hardware and is it active? Need to know those things to hand out the right part numbers.

 

[demarco39730]

Well, is this a 5.3 or a Denali with a 6.2? Does the engine still have AFM hardware and is it active? Need to know those things to hand out the right part numbers.

Yukon SLT
I don't know what a AFM is

 

[demarco39730]

Yukon SLT
I don't know what a AFM is

It is a flex fuel vehicle

 

[swathdiver]

Yukon SLT
I don't know what a AFM is

Ok, AFM stands for Active Fuel Management. What it does is drop 4 cylinders offline under certain conditions for better fuel economy. So these engines have 2 different kinds of lifters, 8 for the regular cylinders and 8 for the AFM cylinders. You'll also need to change the lifter guides and the VLOM...

But did the guy say WHY you need new lifters and did he mean all of them? Did you have a particular cylinder go bad or something?

 

[avalonandl]

Your VIN Number will have the engine code....look it up.

 

[demarco39730]

After spark plug and coil change he said that it was still missing on cylinder 3 so most likely it was going to be the lifters are bad


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[Chert_Detective]

If you have AFM/DOD get a delete kit, and only use either GMPP 12499225 or Morel 5315 lifters.

Let me repeat that.

ONLY USE GMPP 12499225 OR MOREL 5315.

Do not get them from Ebay or Amazon! People sell knockoffs prone to failure branded as those part numbers. They are not the real thing! Unless you get the GMPP ones from a dealership that happen to still have some in stock, anyone currently advertising that part number and saying they have them in stock is selling a cheap knockoff. Also they are not the same as an oem LS7 lifter which some people try to substitute for the GMPP, I would not suggest those either.

Tick Performance and Texas Speed sell both the GMPP lifters (which are on national backorder) and the Morel lifters. They also sell a complete AFM/DOD delete kit with gmpp lifters but I'm sure they would throw in the Morels if a phone call was made when you order.

While you're inside, replace the lifter trays with brand new oem ones. They're less than $8 and you do not want to reuse the stock ones or buy ebay.

I can not stress enough the importance of buying good quality name brand lifters and oem trays.

Here are the links

https://www.tickperformance.com/tick-performance-afm-dod-delete-kit-for-ls-engines/

https://www.tickperformance.com/morel-hydraulic-roller-drop-in-lifters-for-all-lsx-engines/

https://www.tickperformance.com/gm-lifter-tray-for-all-ls-engines-1-guide/

 

[Chert_Detective]

After spark plug and coil change he said that it was still missing on cylinder 3 so most likely it was going to be the lifters are bad


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At 300k it's very possible it's also just a choked up cylinder. Carbon build up can cause pre-ignition along with a random miss. The carbon will create sharp points on the piston or on the cylinder head that cannot dissipate heat and so it will ignite that cylinder before the spark plug. Try a good seafoam and a tank or two of a Techron or Lucas brand fuel system and cylinder cleaner. If you still have a miss then think about pulling the heads.

 

[demarco39730]

You guys are great thanks for the info


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