Seized AFM lifter round 3

[Mathew Kirsch]

Just paid to have all 16 lifters replaced in my 2015 Silverado 1500 5.3L with 141,000miles, because one seized in the #3 cylinder.

 

This happened the first time back at around 103,000 give or take.

 

Got it back, ran mint. For about 500 miles.

 

Last Saturday I was 150 miles from home, and had just gotten up to highway speed on the expressway when something caught my eye. The traction control light was on, then I saw the check engine light blinking. Sure enough when I got into it even a little, it would start shaking and squeaking. 

 

The mechanic who fixed it came over yesterday and scanned it. Says it's misfiring on #1. So maybe not another seized lifter? Sure feels like one though...

 

'Bout ready to send the truck to the crusher, and swear off GM products for life.

[diyer2]

I understand but the install may have something to do with it. 

[16LT4]

Plenty of reasons for misfires, I'm assuming the ignition system was ruled out? Intake valve CBU?

Edited July 5, 2022 by 16LT4

[Mathew Kirsch]

43 minutes ago, 16LT4 said:

Plenty of reasons for misfires, I'm assuming the ignition system was ruled out? Intake valve CBU?

 

It happened Saturday. I didn't get home until 7PM. Sunday was Sunday. Yesterday was a holiday. 

 

Hopefully he's able to take a look at it today.

 

 

[Snowcamo]

Lifter, cam pushrods need to be replaced at the same time. Not one or the other. Check the ignition coil to plug wire connections as they corrode over time.

[mjm-1957]

The squeaking is never good, could be a roller let go on one of the lifters and is grinding down the cam lobe.

[customboss]

2 hours ago, 16LT4 said:

Plenty of reasons for misfires, I'm assuming the ignition system was ruled out? Intake valve CBU?

CBU = internet for carbon build up........gawd that had me wondering what the heck was......cluster bombs etc.....LOL  

[pokismoki]

even the Dodge rocker arms have issues, no matter what truck you buy these days they are all ******! too many gizmos and features..   better off going back to old SB1 motor with carb and mechanical fuel pump and digital ignition. 

 

 

if you stripped off all the emmissions stuff the 5.3 would be awsome again

 

 

Edited July 5, 2022 by pokismoki

[16LT4]

21 hours ago, customboss said:

CBU = internet for carbon build up........gawd that had me wondering what the heck was......cluster bombs etc.....LOL  

 

Seems to be a bit of a concern for some DI engines in these trucks, but is definitely a concern for Ford Ecoboosts, BMW N54/N55 and VW/Audi EA888 engines.  Just another potential cause of misfires, especially at the OP's 140k+ miles.

 

 

[customboss]

44 minutes ago, 16LT4 said:

 

Seems to be a bit of a concern for some DI engines in these trucks, but is definitely a concern for Ford Ecoboosts, BMW N54/N55 and VW/Audi EA888 engines.  Just another potential cause of misfires, especially at the OP's 140k+ miles.

 

 

Absolutely!  An issue that I worked earnestly on before retirement. Starting with Toyota 3.0 V6's in early 2000 and ended in HD DI diesel engines carbon cleanup in-situ. 

[Mathew Kirsch]

The mechanic had good news for me. Valve train is OK. Cam is OK.

 

#1 fuel injector is either stuck open or not firing at all. He thinks stuck open because the #1 plug was "washed clean."

 

This is the second time the #1 injector has failed. Happened very early on when the truck only had a couple thousand miles on it.

[diyer2]

 

Great news. 

A suggestion, shorter OCI's maybe change oil brand. 

 

[KARNUT]

I just noticed there was 2 threads on the same truck. Most people who want to be helpful are going to ask questions. Cost analysis, how many miles, original owner, shape of vehicle, only vehicle. And most important who's doing the work. At different stages in my life I would do things differently. Early on I would do the work myself. Rebuild the top end myself or salvage engine. Probably my only vehicle needing to fly. Staged two fix good enough to trade in. Staged three in my 40s screw it trade in running bad take the hit. In my 50s with the low mileage 6.0 truck available. Pull the 6.0 modify it and the transmission install in the 2015. The parts to do all that is available. In the rust belt my whole out look would be different. I’d have a Subaru for bad weather. My truck would be in the garage it would be cherry. The only that would be original would be the block.. People forget we’re all different, live in different parts of the country. 

[16LT4]

3 hours ago, Mathew Kirsch said:

The mechanic had good news for me. Valve train is OK. Cam is OK.

 

#1 fuel injector is either stuck open or not firing at all. He thinks stuck open because the #1 plug was "washed clean."

 

This is the second time the #1 injector has failed. Happened very early on when the truck only had a couple thousand miles on it.

 

And the resulting fuel dilution of the oil is probably at least partially at fault for your repeated lifter/valvetrain issues.  Methinks the crux of the issue has been stumbled upon...

[diyer2]

How often did you change the oil and filter? 

What oil and filter?