[David Jones]

I have never seen an actual picture of a coked up Ford F150 valve. I'd love to see a picture simply because I don't believe the problem exists. My 2016 2.7 Ecoboost had 109ish thousand miles on it and ran like a top when I traded it. I spent a lot of time on the largest F150 forums and never saw an actual case of valve coking with any year model or size F150 Ecoboost....and I looked. I did a long thread on the largest F150 site of about a friends 2016 2.7 F150 that ran 465,000 miles (industrial parts off hour delivery) before the transmission died. Never had an internal engine issue and did oil changes as the monitor suggested it....which works out to be every 10,000 miles. No, I think Ford got the direct injection thing right from the get go and adding port injection fixed a problem that never materialized.

 

[AKSHARK]

Years ago, while working at a VW dealership, we had a Golf that would not start do to EXCESSIVE carbon build up on the back side of the the intake valves. Crank it long enough, the carbon would become saturated enough to allow fuel into the chamber and it would start. We were told the carbon build up was due to poor quality fuel, hence the advent of Techrom and other additives.

Fast forward to now, direct injection. Spraying directly into the the chamber, bypassing the intake valves. How does the carbon build up get there now?

Just wondering? I have a 2015 Audi 2.0L, its displaying the cold start symtoms, misfiring during inital start for about 20-30 seconds.

Perhaps the induction cleaner method would work better than additives in the tank?

 

[stevem5215]

Get some induction cleaner and it will help that engine. I think the official Audi cleaning method is around $2000.