How to Clean EGR Valve in Your Car (How It Works)

one, two, three, four!

Rev up your engines!

it's time for the Scotty Kilmer Channel, today

I'm going to show you how to clean EGR valves on your car,

so you don't have to buy a new one, now EGR valves stop nitrogen oxides

pollution, so they have to work right or your check engine light will come on and

you can fail an emissions test, and sometimes they'll break and they'll

stick wide open, then it'll suck so much air that the engine will idle poorly and run

bad, as you can see, the hot exhaust gas comes out of the engine and some of

it goes into the EGR valve, which when it's opened up, sends a hot exhaust gas

back into the intake manifold, so that sends already burned gas into the engine

so the engine temperature is lower and when it combusts, it won't create nitrogen

oxides and pollute the atmosphere, so I'm going to show you how you can take them

apart, clean them, then put them back on and make them work like new, now the

bolts are often rusted on, so I spray some WD-40 on them first, spray it on the

threads so it will come off easier, then as you can see, it turns a lot easier and

comes off, then you unbolt the side bolts on this one, that holds it in place,

give it a few taps with a hammer, and you'll wiggle the heck out of it to get

it off, now before you start cleaning, if you look inside, you'll see there's a

little rod and a diaphragm, you want to give it vacuum pressure and pull on it

to see if the diaphragm is ripped, because if it's ripped, you're going to have to buy

a new valve, so you get a vacuum pump, and

you hook it up to a vacuum line and then suck on it, and when you do that

watch the valve, see how it moved up, that means the diaphragm is working and this

one is good for cleaning, you can also watch the vacuum gauge, if the gauge goes

and then when you let go it starts sinking goes down to zero, it means it's

ripped, and you're still going to have to replace it, but this is holding pressure

and moved it, so we can clean it, now to clean it, you can use any kind of solvent,

and you would have spray it inside, the pintle is inside here, any of the big

openings, spray it, and if you really want a good job, do it upside down,

and let it soak for four or five hours if you really want it to soak good, that'll

get any carbon off, what you're doing is cleaning the little pintle that's inside

there, it's a little needle and it blocks it when it's down, and when it opens up, it

lets exhaust gas go inside to the engine, so it doesn't create nitrogen oxide

pollutants, and like I said if you want it to really be cleaned well, you might

just fill it up upside down, let it soak overnight, and then put it on the next

day, because this solvent could take a while to get rid of carbon build ups, and then

of course slide it on and bolted back on when you're done, and make sure you get

them on nice and tight, then start it up, and feel with your hand, make sure it

has no exhaust leaks, you want to make sure

the exhaust parts are super tight, and remember if you got any car questions

just visit the Scotty Kilmer channel, and I'll answer them as soon as I get

done taking this for a drive! so if you never want to miss another one

of my new car repair videos, remember to ring that Bell!