fsi / carbon buildup

[Cody Forbes]

No need for rumor, I've personally seen "5th injector" cars here in North America. Every new Allroad I've seen had it, and a few 2014 A4's. they are also flex fuel compatible.

-Cody Forbes (mobile)

On Jun 6, 2014, at 11:40 AM, thejimrose <thejimrose at gmail.com> wrote:

> rumor is that the euro audis [not m/a yet] are using upstream injectors
> [intake] to wash the backs of the valves to prevent / minimize carbon
> buildup. read any rs4 forum about it, the pictures are a horrorshow. guys
> rolling in with the ports 50% clogged and putting down 200hp. agreed that
> it's a 40k service check / job. i think most shops are doing it for a few
> 100$. it's not a nightmare, just another component to the vag ownership
> 'character'. trade your cam follower checks / replacements with decarbon
> treatments.
> 
> also it sounds like guys running pcv deletes, catch cans, and frequent
> seafoaming in the intake still doesn't prevent the carbon buildup. i know
> nothing of chemistry but it makes sense that you need some fuel to act as a
> solvent to prevent carbon from forming when the engine is hot, once it
> forms/hardens during the drive cycle it's probably mostly there to stay,
> until it's forcibly removed a la media blasting and dental picks.
> 
> no such issues on my sti. of course the ride quality is like being in a
> metal trashcan full of hammers rolled down a hill.
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