Originally Posted By: MoultrieCreek
I see this topic pop up in automotive forums all the time and wonder the same thing myself. Diesel motors never spray fuel on their intake valves, and I've never heard of any unusual or excessive service to clean carbon deposits from them... in the meantime I think these discussions have promoted the sale of lots of "catch cans" and a new recommended service of pulling the manifold to clean valves. I do suspect there is something here I don't understand because of the fact Toyota found it wise to keep the dual MP and DI systems on a few models. I keep reading these posts now that I own a DI Chevy truck with 37K miles on it just to see if there is a problem on the horizon - but I'm pretty confident so far they have engineered a better engine than the last generation.
I never thought about this until you pointed it out. I have had the cylinder heads off of several diesel engines, from 6v53 Detroits to 903 Cummins, 7.3 PowerStrokes, 6.5 GM Diesels turbo and non turbo. I have never witnessed any carbon build up on the back side of the intake valves that I would consider excessive.
This is very interesting topic to me, I have a 2015 F150 with the 3.5 Ecoboost. I'm curious to see how it performs over the long haul. So far it's amazing to me, the power it's very diesel like in it's power delivery to me.
I see this topic pop up in automotive forums all the time and wonder the same thing myself. Diesel motors never spray fuel on their intake valves, and I've never heard of any unusual or excessive service to clean carbon deposits from them... in the meantime I think these discussions have promoted the sale of lots of "catch cans" and a new recommended service of pulling the manifold to clean valves. I do suspect there is something here I don't understand because of the fact Toyota found it wise to keep the dual MP and DI systems on a few models. I keep reading these posts now that I own a DI Chevy truck with 37K miles on it just to see if there is a problem on the horizon - but I'm pretty confident so far they have engineered a better engine than the last generation.
I never thought about this until you pointed it out. I have had the cylinder heads off of several diesel engines, from 6v53 Detroits to 903 Cummins, 7.3 PowerStrokes, 6.5 GM Diesels turbo and non turbo. I have never witnessed any carbon build up on the back side of the intake valves that I would consider excessive.
This is very interesting topic to me, I have a 2015 F150 with the 3.5 Ecoboost. I'm curious to see how it performs over the long haul. So far it's amazing to me, the power it's very diesel like in it's power delivery to me.