Did the big project on my 2011 at 140k (cleaning egr and manifold, new OEM spark plugs, replacing pcv valve, map/maf sensors cleaned, etc) and all in all I was pleased with how smoothly it went.
Afterwards, acceleration feels a little smoother maybe but no extra pickup really, and the little rattle when accelerating after startup I had started to hear is gone, but after 350 miles of my normal driving I’m down 5+ mpg from a a stable average of 48mpg to 42mpg.
What’s the deal? Interested to hear any insights.
The egr and small manifold channels were completely clogged but I really got into the cleaning and I feel that they both went back in about as close to pristine as possible. No issues with reinstall at all. Tires inflated, same gas as always. The engine doesn’t necessarily sound any smoother when idling, but I think it’s just the normal Prius sewing machine engine sound that’s always a little weird. I was interested to see if there’d be a bump in efficiency after seeing how slammed the airways were, so I’m surprised to see it go in the other direction!
Grateful for the help of this sub, priuschat, and YouTube creators while getting through the initial project. Amazing resources available.