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

[Chris and Cathy Kershaw]

Texas speed is the one I hear is a reliable & quality source.

On Sun, Jun 8, 2025 at 9:17 PM Tod Chretien via trnw2 <trnw2 at trnw.net>
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>
> <trnw2 at trnw.net> wrote:
>
>
> *Post ID:* 21395
> <https://www.trnw.net/trnw/forum_thread.php?post_id=21395&forum=2>
> *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
>
>
>
> ------------------------------
>
>
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>
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>
>
>
>
> --
> Best Regards,
> Tod Chretien
> TRNW Inc.http://www.trnw.net
>
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