You need a good light , you can tell by looking in there if they are closed , but if your skeptical spray a little first and see if the fluid stays if it does not then it’s open , if that happens don’t start the engine for a few hours , I take valve cleaner or brake fluid in small mounts will dissipate after a while

@@PRviewsvlogs thank you very much for your reply, that is a great tip! I'll try with just a little bit and see what happens.

No side effects if done properly. Just make sure the valve is closed and no residue should go in. It also will not harm the engine if a small amount does get in as it will burn off anyways. Your pistons also build up carbon however gasoline is shot onto them which keeps them cleaner then the intake valves. Fuel injector cleaner such as Techron or Seafoam can also help clean up the carbon buildup off the pistons when you add it to your gas tank.

Thanks! Yes it is a wire brush attachment from the same brush kit from harbor freight tools. This link is below if you want to check it out. www.harborfreight.com/engine-brush-kit-20-piece-63732.html

To be even more specific, the gold one is brass (I used the same pack from Harbor freight)

Wouldn't using a brass brush be to rough for the intake valves and the ports ?

Thank you for the feedback! Start up was normal as usual. It is similar to changing the oil on your car. It is necessary to keep the engine running good however you won’t necessarily feel the effects of it unless your valves were very dirty hindering your engine’s efficiency. There should be no residue since you are removing all of it from the valves while they are closed. When the valve is down there is an air tight seal. This is why it is very important to make sure the valve is closed so that you can use the cleaning chemicals and brushes to remove the carbon buildup. If for some reason you do happen to leave residue it is not a big deal. If excess carbon is left loose, it will burn when it falls into the combustion chamber. If you leave carbon residue caked on the valves it will remain caked on the valves as it was before you cleaned it. I hope that answers your question. I’d be happy to answer any others you have!

@@jaydengarcia389 Perfect! Thanks.

​@@jaydengarcia389 I may have messed up , #5 & 6 were still slightly open . I cam only assume my spray & gunk got in. Any suggestions ?

hey mentioned in the video that they are nylon brushes. they look like wire tho

Yeah it’s unfortunate and makes us do extra work to keep our cars running.

@Jayden Garcia all for an almost negligible improvement to emissions. Which is only applicable when the valves are in good condition. As the problem shows itself, it actually has a detrimental effect on the emissions. Becoming worse than your typical port injection... we are ruled by fools.

That's not an engineered failure point. It's just cost saving that was used for this engine. Direct injection increases power, but then you get carbon build up. The more expensive solution would have been to have dual injection keep valves clean and have a powerful engine, but this is GM bean counters we're talking about here.

It's value engineering for the manufacturer, not for the consumer.

@@PURENTYes this is true. ZZP performance actually sells a kit to add a 5th injector that uses port injection to make more power. This would also keep the valves clean.