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

[Steve Everett]

   I believe I'd pull the valvecover for that side and watch the rocker, if
it is moving some but not full movement the spring on the lifter is likely
collapsed,  That is one of the cylinders that the DOD affects,   since it
happened after you punched it chances are its just the lifter as opposed to
the camshaft lobe being damaged.

   Steve

On Sat, Jun 7, 2025 at 9:53 PM Tod Chretien via trnw2 <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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