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

[Ryan D]

Yes, compression test .

On Saturday, June 7, 2025, 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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-- 
Ryan
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