[KingLT1]

When I swapped my Pray ported setup, I noticed that my Valves were pretty clean @ 3200miles compared to other pics I have seen. There was a light film on the casting of the intake ports but the back side of all the valves were clean. The only thing I did was remove intake tube, disconnect maf, start engine, spray carb/brake clean through throttle body @ 1500 miles.

Reason, I did this on my GMC Terrain with GDI 2.4 @ 50k miles and it smoked like a Mosquito fogger out the exhaust for 10 minutes as it burned off all the gunk in the engine. Then I repeated the same thing @ 65k miles and not much smoke at all. My Camaro did not smoke much at all either but not hardly any miles.

Could this be a good preventative measure to keep oil from building up on the valves?

[MatthewAMEL]

Originally Posted by KingLT1

When I swapped my Pray ported setup, I noticed that my Valves were pretty clean @ 3200miles compared to other pics I have seen. There was a light film on the casting of the intake ports but the back side of all the valves were clean. The only thing I did was remove intake tube, disconnect maf, start engine, spray carb/brake clean through throttle body @ 1500 miles.

Reason, I did this on my GMC Terrain with GDI 2.4 @ 50k miles and it smoked like a Mosquito fogger out the exhaust for 10 minutes as it burned off all the gunk in the engine. Then I repeated the same thing @ 65k miles and not much smoke at all. My Camaro did not smoke much at all either but not hardly any miles.

Could this be a good preventative measure to keep oil from building up on the valves?

No. The LT1 has direct injection. The cleaner doesn’t touch the backside of the valves, where the deposits are.

The only effective cleaning that I know of are methods that directly touch the valve (brush, walnut media, etc).

[KingLT1]

Originally Posted by MatthewAMEL

No. The LT1 has direct injection. The cleaner doesn’t touch the backside of the valves, where the deposits are.

The only effective cleaning that I know of are methods that directly touch the valve (brush, walnut media, etc).

I know exactly what kind of injection the LT1 is....Any chemical sprayed through the throttle body with the engine running will make contact with the valves. I am not talking about mixing it with the fuel, read my post thoroughly.

[Deakins]

I do it just to help the issue but I also plan on having to clean the top end someday. I don't see it hurting anything so why not.

[PolynesianPowerhouse]

I don't know how "detergent" the carb cleaner is, even though its a solvent, but this would possibly be a good choice for valve cleaning. its something I;ve used over the last 3 years in the LFX in my 2013 and LGX 2016 now.

http://www.crcindustries.com/product...-oz-05319.html

[AndyUK]

some people recommend SeaFoam in through the throttle body every once in a while on direct injection engines as well

[Gunkk]

Yeah the CRC should work as well as SeaFoam since it's basically the same stuff. Main ingredients... Diesel fuel 25% presumably to carry the Techron (polyether amine) 15% as a mist all the way to the valves, other solvents ~22%, 35% propellant, pixie dust 3%.

Gonna smoke like hell after you use this stuff (diesel, liquified oils from the intake, etc..).

[edit] You can also make your own, but you will need a propellant or have to use a sprayer

------From the MSDS-----
3. Composition/information on ingredients
Mixtures
Chemical name Common name and synonyms CAS number %
liquefied petroleum gas 68476-86-8 30 - 40
distillates (petroleum), Diesel Fuel No. 2 64742-80-9
hydrodesulfurized middle
20 - 30
distillates (petroleum), hydrotreated 64742-47-8
light
10 - 20
polyether amine Proprietary 10 - 20
distillates (petroleum), hydrotreated 64742-46-7
middle
5 - 10
hydrocarbyl amine Proprietary 3 - 5
solvent naphtha (petroleum), heavy 64742-94-5
arom.
1 - 3
naphthalene 91-20-3 < 0.2

[KingLT1]

Good info guys! Glad to see I am not the only one doing this for preventative maintenance. It really seems to help the DI motors.

[PolynesianPowerhouse]

Originally Posted by KingLT1

Good info guys! Glad to see I am not the only one doing this for preventative maintenance. It really seems to help the DI motors.

did this on the 2013 Camaro for the 2 years I had it and the year and a half with the 6th gen now. 150,000 miles combined nearly.

[Desert Drifter]

interesting. So do you pull the intake pipe (from the air filter) off the throttle body and spray the SeaFoam or other cleaner into the mouth of the throttle body while the car is running?

Or do you pull off the intake pipe spray the stuff in, reassemble it, and then start the car up? This second way seem like the cleaner would just lay in the manifold.

[MatthewAMEL]

Originally Posted by KingLT1

I know exactly what kind of injection the LT1 is....Any chemical sprayed through the throttle body with the engine running will make contact with the valves. I am not talking about mixing it with the fuel, read my post thoroughly.

And I wasn't talking about mixing with fuel, either.

You cannot remove the carbon buildup on the valves by spraying through the throttle body. You must use a media/pressure process to remove build-up.

BG and others who offer a DI cleaning system have a full multi-step process for this. BMW/MB/Porsche all use media cleaning.

[KingLT1]

Originally Posted by Desert Drifter

interesting. So do you pull the intake pipe (from the air filter) off the throttle body and spray the SeaFoam or other cleaner into the mouth of the throttle body while the car is running?

Or do you pull off the intake pipe spray the stuff in, reassemble it, and then start the car up? This second way seem like the cleaner would just lay in the manifold.

Engine has to be running. Disconnect maf so the ECM will default to open loop and run. It will throw a CEL but you can clear it afterwards.

[KingLT1]

Originally Posted by MatthewAMEL

And I wasn't talking about mixing with fuel, either.

You cannot remove the carbon buildup on the valves by spraying through the throttle body. You must use a media/pressure process to remove build-up.

BG and others who offer a DI cleaning system have a full multi-step process for this. BMW/MB/Porsche all use media cleaning.

Then why has it been proven that meth injection equipped cars running forced induction have cleaner intake, valves, and pistons?

I bet they do...it's another way to make money instead of telling owners to spray cleaner through the throttle body in regular intervals to help keep gunk from baking on the back side of the valves. Obviously if you let the engine go 50-100k miles and it builds up, then this probably won't work. However if you start doing it early in the engines life, I bet it no doubt will help.

[AndyUK]

Originally Posted by MatthewAMEL

And I wasn't talking about mixing with fuel, either.

You cannot remove the carbon buildup on the valves by spraying through the throttle body. You must use a media/pressure process to remove build-up.

BG and others who offer a DI cleaning system have a full multi-step process for this. BMW/MB/Porsche all use media cleaning.

I've seen it done on a car with about 30k miles on it and it does remove the majority of whats there - this isn't going to completely fix a car with 100k on it and down on power, but done regularly it would certainly help stave that day off