AlphaOmega
New Member
- Joined
- Feb 11, 2021
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Hi all,
Been lurking here for awhile and just joined. Bought a 2020 3500 HO Cummins about 4 months ago. Had it to the dealer yesterday for belt/pulley chirp, and check engine light (which ended up being and exhaust sensor I guess). Anyway, they also reflashed my PCM yesterday because apparently there was an update. I've noticed a significant increase in predetonation/dieseling noise since I picked it up. Before it really only was happening when cruising at moderate speed and then speeding up. Now it is happening with pretty much any acceleration, even at highway speeds. Seems like the trans is shifting weird too, but I'm guessing maybe it has to relearn again. Anyway, this is my first Cummins engine. Previously I have had 2 Duramax diesels, which were super quiet, and quite responsive all the time. Mine has had what I would consider horrible turbo lag since I got it, and now the predetonation noise. Just wondering if this is normal for these engines or if I should be concerned about the reflash?
Been lurking here for awhile and just joined. Bought a 2020 3500 HO Cummins about 4 months ago. Had it to the dealer yesterday for belt/pulley chirp, and check engine light (which ended up being and exhaust sensor I guess). Anyway, they also reflashed my PCM yesterday because apparently there was an update. I've noticed a significant increase in predetonation/dieseling noise since I picked it up. Before it really only was happening when cruising at moderate speed and then speeding up. Now it is happening with pretty much any acceleration, even at highway speeds. Seems like the trans is shifting weird too, but I'm guessing maybe it has to relearn again. Anyway, this is my first Cummins engine. Previously I have had 2 Duramax diesels, which were super quiet, and quite responsive all the time. Mine has had what I would consider horrible turbo lag since I got it, and now the predetonation noise. Just wondering if this is normal for these engines or if I should be concerned about the reflash?