Manifold carbon build up

[syntex]

Whats is the best solution for the manifd carbon build up?
Without removing the manifold

Thanks

 

[eurocars]

There is no real "solution" without removing the manifold to scrape the carbon away. Its not a difficult job, just time consuming if you dont have a walnut blaster

 

[gti2slow]

Hot engine + solvent seems to help. Nothing will do as good as a manual cleaning.

In my case I used Seafoam aerosol, CRC came out with a specific product for DI buildup.

E-Mail seafoam sales to get an exotic application straw (Melted end shut and 4 holes poked into the side, makes a nice mist cloud) and pick up a rubber stopper from a hardware store. Drill hole in stopper, push straw through stopper and insert the contraption through the IAT sensor hole on the manifold.

Took off a lot of the darker buildup but left the light grey baked on deposits.

 

[zrickety]

Driving hard for 30 min (Italian tune up) will minimize the deposits. I turned 110k and still haven't removed the manifold.

 

[Nitrorea]

Chemical agents are a 'band aide' solution. That's pretty much it without taking the manifold off.

 

[syntex]

How to use it?

 

[ROH ECHT]

Don't use very much solvent. Most top brand blow-by products only have 3oz of solvent in them per 12oz can or bottle.
I use my own method and my solution is 12oz fuel and either [2oz NAPHTHA and 2oz Mineral Spirits] or [just 4oz of either Spirits or NAPHTHA]. So 12oz fuel with 4oz solvent. Engine temps need to be at operating temps. If wanting to increase the amount...just add more fuel to the 4oz of solvent.

https://www.youtube.com/watch?v=fy53uOVeSKw

My bore-scope pics ↓
Before:


After:

 

[Timpanogos Slim]

Driving hard for 30 min (Italian tune up) will minimize the deposits. I turned 110k and still haven't removed the manifold.

I'm skeptical of that working well on a direct injected engine. It works on indirect injected engines because fuel enters through the valves.

'course, I have a borescope but haven't stuck it into the manifold on mine, at 101k.

 

[avenali312]

1. Delete manifold.
2. Delete valves.
3. ???
4. Profit.

Kidding aside, I did a manual cleaning at around 90k and it was super gross in there. It's probably gross again already at 130k now.

 

[pb4ugoout]

I'm skeptical of that working well on a direct injected engine. It works on indirect injected engines because fuel enters through the valves.

'course, I have a borescope but haven't stuck it into the manifold on mine, at 101k.

I have a borescope but can't get the thing through the IAT hole in the manifold without it accumulating a ton of black crusty stuff over the lens. I guess I need a smaller scope. I haven't done anything in 120k miles and really haven't had any issues. Every now and then I just floor it, watch the black smoke go everywhere, and figure it's good enough. I never get black smoke on subsequent runs in the same time frame so I know it's blowing out something.

 

[gti2slow]

Deleted my flaps and can get the bore scope down to the valves easy now.

Whats not baked on can be cleaned off chemically, getting to cyl 1 & 4 are tougher.

 

[iagiansti]

Whats is the best solution for the manifd carbon build up?
Without removing the manifold

Thanks
View attachment 95712

Just curious if you have a catch can installed ? I'm at 75k without one and have pumped alot of oil thru the engine. I'm about to get a walnut-shell blast as I have been having idle and misfire issues lately. I'm scared to see what my valves look like.

 

[zrickety]

There are real patents for what I'm saying. The high rpm creates a very hot operating environment and essentially starts baking it off the valves. Stop using 6th gear and do some highway driving in the hills.