TRNW-2: MISCELLANEOUS, 2018 Silverado 5.3 with a misfire

[jbockus at hiwaay.net]

Hi Tod, I've reached out to a couple shops locally that do this 
conversion regularly and waiting to hear back from them. I'm sure they 
have great recommendations on suppliers and procedures. I'll let you 
know as soon as I hear back from them.

On 2025-06-08 8:17 pm, Tod Chretien via trnw2 wrote:
> I definitely want to covert it to traditional camshaft and lifters,
> deleting AFM. I was looking at this package deal but I am not so sure
> about the quality of the parts.
> 
> https://www.ebay.com/itm/405209555650?var=675310965679
> 
> What do you folks think? That one or maybe this one...
> 
> https://www.texas-speed.com/p-18933-l83l86lt1-dod-delete-kit-w-camshaft-for-2014-2018-gm-models.aspx
> 
> 
> On 6/8/2025 7:40 AM, Jim Bockus wrote:
> 
>> Pretty common for the AFM lifters to fail and ruining the camshaft.
>> If you have to tear down the top end it's best to convert it to
>> traditional camshaft and lifters and disable AFM. Not sure if you
>> can do this legally in California but it's common in Alabama. You do
>> have to remove the heads to access the lifters.
>> 
>> I watched a video the other day about what a PITA it is to remove
>> the oil pump which runs off the front of the crankshaft, the problem
>> is accessing the oil pump pickup bolt, you're supposed to remove the
>> oil pan to get to it but this guy modified a wrench to get to it.
>> Then the next problem is reinstalling the bolt, I guess there's
>> actually 2 bolt holes in the pump but it only uses one, he ground
>> off the spot weld on the flange so he could rotate it and used the
>> bolt hole in the pump that is accessible. I'm sure you can find
>> plenty of information on YouTube.
>> 
>> On Jun 7, 2025 8:52 PM, Tod Chretien via trnw2 <trnw2 at trnw.net>
>> wrote:
>> 
>>> Post ID: 21395 [1]
>>> Date: Sat Jun 7 18:52:40 PDT 2025
>>> Subject: MISCELLANEOUS, 2018 Silverado 5.3 with a misfire
>>> This isn’t a transmission problem so please forgive me for that.
>>> I just bought a 2018 Silverado with 110K. It started making a
>>> light tapping noise on moderate to heavy acceleration. About 3
>>> days later I had to punch it to beat some oncoming traffic and it
>>> started misfiring severely. The #1 cylinder is counting misfires
>>> so I pulled the spark plug and they definitely haven’t been
>>> replaced yet. Hoping for the best I replaced the spark plug but
>>> it’s still counting up on #1. I swapped the coil with #3 but it
>>> didn’t change. I hear the lifters on these AFM engines have
>>> issues. Does anyone know what goes wrong with the lifters and how
>>> to diagnose it? Would it have no compression? Sorry for the dumb
>>> question but book time is over 20 hours and I don’t want to do
>>> the wrong thing. Any help or insight would be greatly appreciated.
>>> 
>>> Tod Chretien
>>> Ralph's Transmission
>>> Modesto, California USA
>>> tod at trnw.net
>>> 
>>> -------------------------
>>> 
>>> To Read The Entire Thread, Click The Link Below
>>> 
>>> Read Entire Thread [1]
> 
> --
> Best Regards,
> Tod Chretien
> TRNW Inc.
> http://www.trnw.net
> 
> 
> Links:
> ------
> [1] https://www.trnw.net/trnw/forum_thread.php?post_id=21395&forum=2
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