5.0 Cold Start Bogging

[HCFX]

Mine does this and you can really hear it with the more aggressive dual exhaust on the black package. Chalked it up to weird cam timing and dumping fuel on cold start to heat the cats quicker for emissions. Seems to not be as prevalent now that i've switched to 94 octane.

Sponsored

 

[dmac]

I was just able to make the bogging occur in sport mode on startup, so it's not cylinder deactivation. I also heard some tapping this time. Sounded like knock...

I'm going to do a PCM reset and see if that helps.