This Illegal Mod Will Make Your Car Run Better

This Illegal Mod Will Make Your Car Run Better

rev up your engines today I’m gonna talk
about an illegal modification that people used to do all the time on cars
make them run better and that has to do with removing the EGR valve now on my
matrix here it doesn’t have an EGR valve but I didn’t remove it illegally it
didn’t have one in the first place cuz it’s a more advanced design know each
our valves are anti-pollution devices stands for exhaust gas recirculation
valve when they first put catalytic converters on cars when they put the
catalytic converters to burn pollutants what happened was they got too hot
because as they burned the pollutants sometimes they’d get red-hot burning the
unburned hydrocarbons and things just got too hot so engineers started
scrambling how can we make the combustion temperature get lower well
they did it by reducing the amount of oxygen going into the engine realize
that if you add an inert gas into the combustion chamber then it can’t burn as
well and it won’t get us hot now they could have done something like put a
canister nitrogen that’s an inert gas and have that add it to the engine of
course that would have to be refilled you know Americans weren’t gonna be
refilling up so they came up with this bizarro compromise the EGR valve this
bolts of the exhaust the EGR valve takes exhaust gas and the old ones like this
used the vacuum valve that would open it up when it was needed and the exhaust
gas was then routed into the engine now you might think why the heck would you
put exhaust gas into your engine it’s the stuff coming out well
exhaust gas is already burnt gas it’s mainly inert so it sounds weird but it’s
true but adding this somewhat hot exhaust gas into the engine actually made it burn at a lower temperature even though it was a
warm gas it didn’t have oxygen in it well a tiny bit oxygen but mostly oxygen
was gone so it was more or less than inert gas so when it went inside the
engine it made the temperatures go low so the
catalytic converters didn’t overheat when I was
young mechanic we see those babies glow and cherry-red not a cases so Toyota
here’s the EGR tube right here you see that tube that tube comes from the
exhaust and goes up connects to the EGR valve here when the engine computer
decides that it needs to send some exhaust gas to the engine to cool it
down it opens up an exhaust gas goes into the intake and it’s sucked inside
the engine and that reduced the temperature inside the engine so it
didn’t create oxides of nitrogen which is a deadly pollution for humans got rid
of leaded gasoline because the lead pollutes and hurts people catalytic
converters originally they’re supposed to burn unburned hydrocarbons that are
bad for you but they were burning so hot they were creating these oxides of
nitrogen that created a different type of pollution so they traded one
pollution for another with the first catalytic converter system so these
old-fashioned simple EGR valves kept them from creating all these oxides of
nitrogen it was adding an inert gas which made the combustion temperature
get lower so the catalytic converters wouldn’t get hot enough inside to create
these oxides of nitrogen all in good from a theoretical standpoint but I’m
sure you realize I’m gonna tell you in the practical world things work
differently the original EGR valves were somewhat
fallible they broke down a lot the rubber would rip because it’s got a
rubber diaphragm while hey all that heat is gonna destroy the diaphragm right and
the tiny little holes inside they would get carbon in them and sometimes they
were jammed wide open if they jammed wide open then the exhaust gas was going in the engine all the time it would run really poorly and then here again they
would create more and different types of pollution cuz the engine wasn’t running
you’re right back in a day I guy would make their own fix to take the EGR valve off
and there’s a gasket here they would just make a solid aluminum gasket bolted
over the hole so the EGR valve wasn’t connected anymore and that was the end
of any problems with the EGR system now the vehicle would run better that but of
course it would also pollute more in a day nobody checked the pollution
there weren’t inspection stations every year where you went in to get the
pollution system tested to see how much your car polluted none of that even
existent so guys would just block them up and drive on their merry way now if
you wanted to check these old ones they were pretty simple you put a vacuum
gauge on here and you give it vacuum and if it lost vacuum and fell down and
didn’t stay up the diaphragm was ripped in you have to buy new one and another
simple test was to just take the hose off put a vacuum gauge on here stock the
car then when you gave it vacuum it would open if it opened the car would
start to stumble at idle and then when you took the hose off and it stops
tumbling you know the thing was working up and down but as I said since some of
the after-effects of burning gasoline is carbon the carbon cut off and carbon up
these valves and they would stick so you could physically take them off you saw
carbon you could spray them with really good cleaner carburetor cleaner already
used in those days there’s better cleaners today but we use carburetor
cleaner you got the chunks off it would work again and the GM ones are so bad
and so notorious that they actually put a screen over this little hole here so
that the carbon pieces couldn’t get it inside because they were so poorly made
the engines and the whole car as a matter of fact that when chunks of
carbon would break off and they often did they clog the valve up so they put a
screen in there to try to prevent that of course there was a stopgap measure
cuz if enough pieces broke off they just clogged the screen and then it wouldn’t
work right either and speaking a nutty designs GM later had electric solenoid
EGR valves that had three electric solenoids that would work to open and
close EGR valve by computer control and those systems were always breaking some of those valves are 300 something bucks apiece and since they do bolt onto the
exhaust part of the engine so exhaust can come through all that heat and then
cold in the winter and then heat when the engine heated up they would often
rust on solid making it almost impossible to get them off a lot of them
were like this Toyota where they had two EGR pipe that screwed on in a pipe
invariably would rot away or when you tried to change it the nut would be
rusted on solid when you pulled it would just break off in your hands so it could
be a real pain in the butt changing these things out on an old car I’m happy
my Toyota here doesn’t have an EGR valve but I didn’t break the law taking it off
they didn’t build them with EGR valve so was toyota polluting more now
actually they’re polluting less because it’s a completely different design it
doesn’t use EGR valves in the first place as you can see this says VVT –
i 16 valve and what that means is that this Toyota engine has a variable valve
timing system that system is all computer run that the cars no longer
need EGR valves to stop the pollution from being created they don’t create
oxides of nitrogen by the design of the valve system since a straight cam with
no variable valve timing has one cam setting and that’s it at certain speeds
it would pollute more so to stop that heat and pollution on with the EGR valve
but take a modern variable valve timing engine it has timing that can vary the
computer can set it for different situations so it does not create the
heat in the combustion chamber that requires an EGR valve to stop oxides of
nitrogen from being created the catalytic converter and yeah it’s super
high-tech technology there’s no arguing that but you take a vehicle like this Toyota they make such good variable
valve timing really have a problem take engines like Nissan and BMW as they age
there are notorious for having variable valve timing problems and if you think
it’s something to buy a $300 EGR valve that some of these Chevy’s had when they
went to the electronic EGR valves where do you see what it costs to fix a VVT
system and a Nissan you can spend thousands on that which is yet another
reason why you want to change your oil regularly in a modern car you don’t have
problems with a variable valve timing system and you know I was cheap variable valve designs are very expensive defects and of course it’s also a reason you
want to pick the right car in a first place because if you see a manufacturers
have problems with the variable valve timing systems in any other engines do
not buy one of those cars because of pollution control government regulations
it’s never gonna go to the Past from cars who are simple and easy and cheap
to fix gonna buy a modern car it’s gonna add variable though
just make sure you pick one that has a solid reliable system not one that
breaks down too early high technology it’s great when it works but it isn’t when it breaks so you want to buy high technology that has high reliability
just really make sure that when you buy a car these days of course you can be
like me and drive a lower technology car now that things still fuel-injected but
it has an infinitely lower level of technology than any modern car 26 years
old so now you know all about the lowly EGR valve how it came into being I know
now it’s pretty much gone extinct now if you have a modern car with variable
valve timing you’ll pretty much be wasting your time trying to find where
it is because the engines don’t even have one
item anymore, so if you never want to miss another one of my new car repair
videos, remember to ring that Bell

About the Author: Michael Flood


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  2. Hello Scotty.
    Would you please help me with my problem. Thank you in advance.
    Simple question.
    Is there a point to wax your car if its parked outside and each day i have to rinse it off from all the dust and stuff from the trees.

  3. Welllllll… it can't be just because of the catalytic converter. The old Mercedes diesel 617's came with an EGR, but no catalytic converter. The reason given is the same, but the gasses are produced in the combustion chamber.

  4. So they make the engine run cooler (stoichiometric fuel oxygen ratio is the hottest) by running it richer by reducing the amount of oxygen available. This also limits the power available for each engine size.

    Doesn't this mean there's a design that chugs air and sips fuel (leaner than stoichiometric), that runs cool and doesn't need a catalytic converter?

  5. Wow you really really don't like Chevy. The old ones with the egr valves were extremely easy to work on and or bypass. The v8s anyways.

  6. Hi Scotty I have a question for you. I drive a 2010 Crown Vic PI and I have noticed that the power steering pump has been whining when I start it up in the cold but after a bit it goes away. I’m assuming it’s nothing serious but I thought I would ask you to get your take.

  7. Scotty I live in Spring. Could you look at my 1994 Toyota Pickup and feature it? It has 254+ thousand miles on it and I want it to run like brand new. Please help me out 🙏

  8. Actually EGR (Exhaust Gas Recirculation) Valves were introduce on most US cars starting with the 1973 models, two years before the catalytic converters. Exhaust Gas Recirculation dilutes the air/fuel mixture, thus lowering the combustion temperature which in turn reduces NOx emissions. The downside was reduced horsepower and fuel economy. In 1975 when the catalytic converters were added, the EGR Valves were redesigned to circulate less exhaust, shifting much more of the NOx control to the catalyst. The EGR Valves were never used for catalyst temperature regulation.

  9. Spot on and agree since I drive a Toyota Avensis 1.8 Valvematic (UK). Reasonable economy 36mpg in town stop/start driving. Dual VVTi and variable inlet duration and lift. No EGR and no turbo, plus no direct injection. Ask VW owners who have these things.

  10. Makes sense now, why i had to change egr valve on the gm engined carbinhad. Ofc after having oily sparkplugs and changing top lid rubber gasket.

  11. Hey Scotty – Since your speaking of EGR valves – there is an epidemic of catalytic converter thefts in AB Canada. They go under your car/truck with a sawz-all and in 3 mins cut it off the vehicle. They must be after the inner materials on the aftermarket. Crazy Canucks. lol.

  12. I drive a 93 austin maestro as simple and agricultural you can get doing 50-70mpg as standard 2 TD now thats simple motoring no nasty cat taking fuel and power…

  13. my dad removed the eco nonsense on the f250 cause we didnt need that and now the truck runs better and also uses less diesel

  14. This was also done to beat the govts. new emission standards, plus the "air pump" , came into play , to effectivly " dilute" the reading of 02, to satisfy new standards.

  15. ok i'm lost here what if I just unplugged it and leave it off, will that do any harm? I'ts a 2003 honda fit. how will the car run?

  16. EGR is still used by Toyota. Not only as pollution control but is now highly advanced and used for quick warm up. Because of this, Toyota has the quickest warm up vehicle in the market.

  17. EGR valves actually started a few years before catalytic converters, but the reason was the same, cool down the combustion, to prevent detonation. You are right, not a perfect solution by any means.

  18. Damn I waited to the last 30 seconds of the video to find out I don’t even have one on my car LOL love your videos though, you rock Toyota man

  19. The EGR valve is for reducing Nitrogen Oxide emissions ( Smog ). The opposite of Carbon monoxide. Nitrogen oxide is created if a car is running to lean. The EGR recirculates exhaust gases into the combustion chamber, causing an incomplete burning of the fuel by reducing oxygen levels. I had an EGR valve on my 1974 318 Plymouth Fury, which had no catalytic converter. It also screwed up your gas mileage.

  20. I work for the Feds. I have been watching this channel to catch Scotty doing this type of video. Finally. Proof he is truthful. Hey a Miata VVT system is not real costly to repair? But I get the point. Have good Holidays.

  21. We have found a better way to reduce the exhaust temperature by up to 120 degrees Celsius. We found that the temperature varied from cylinder to cylinder up to 40 degree's Celsius. The answer we found was due to poor circulating pump flow in the cooling system. We needed to go back to Otto's notes to find the optimum coolant flow rate before tuning a 4 cycle engine. That minimum flow rate is 10 liters per minute at 500 rpm, and the flow and more important the head pressure need to increase as the revs increased. We ended up re-developing the standard pumps to suit Otto's requirements and we were measuring up to 120 degree's Celsius reduction in exhaust temp. Then we were able to further develop the EGR system to take advantage of the un-burnt fuels present in the exhaust charge.

  22. I LOVE your videos! I never knew what an EGR valve was… but in 10 minutes… you explained it the way only an expert can… a lot of information with less words!

  23. Some info here is a bit wrong. The EGR valve was around before catalytic converters. I've seen them on engines that had them as early as 1972, 3 years before cats were mandated.

    Variable valve timing isn't the sole reason for EGR valve existence/disappearance. My dads California 1996 Dodge Ram 5.9L gas engine with California emissions does NOT have an EGR valve. It also does NOT have variable valve timing. My 1999 Accord and 2001 Camry has EGR valves even though they both have variable valve timing equipped engines.

  24. Scotty with his Toyota stories reminds me of this coworker who was telling every single guy at work how wonderful his daughter was, who he was trying to marry off.

  25. That's the best explanation of an EGR valve that I have ever heard!
    • I have delt with my fair share of egr problems. The most memorable was at the Dodge dealership I worked at back in the late 70's. My new Dodge Magnum V8 demo was always running rough. They finally traced it to the EGR. Turns out, after many different mechanics tried to solve the problem, that from the factory, the gasket was reversed…but nobody realized.

  26. Well I am like Scotty, driving a relatively low technology car but mine does have an EGR valve. I drive a 24 year old 1996 Nissan Quest with 311k miles on it. Thanks for the lesson on what the EGR valve is for.

  27. Scotty you make my day a bit brighter, and I’m a Toyota fan boy from way back, still got my 1989 Hilux 22R auto 540k Genuine, just change the god dame oil!!!!thats my my father would say!!!!!!

  28. Lots of cats have been sold to people that have snorkel years of cars, the EGR is the root of high hydrocarbon levels, and can be rigged to fry every cat it touches.

  29. VVT has nothing to do with emissions; it’s to make better power at certain RPMs that an engine normally wouldn’t make power at. for example it will give it more torque at the bottom end or mid range or top end, just wherever the more power is necessarily needed to be increased.. Not sure where this guy gets his information.

  30. Clearly this whole EGR thing was a hippie plot to disable us from driving to recruitment centers to go fight communists.

  31. I had a late 70’s Camaro that the passenger side carpet started smoking because the cat on that side got so hot. Maybe the exhaust got bent putting it closer to the floor pan?

  32. it’s not illegal where i live to remove it. after 25 years in metro atlanta you can remove emission garbage, but outside of metro atlanta you can drive with no cats in a 2020

  33. EGR valves can also allow sharp fragments from a failed catalytic converter to be fed into your intake wreaking havoc. I hate egr

  34. I really enjoy watching your videos. You explain things awesome. I learned so much from watching your videos! Thanks and Happy Holidays.

  35. I don’t listen to you anymore Scotty ….. if I every buy a Toyota or Honda is will be sure to reference you 1st👍👍

  36. EGR valve didn't bolt to the exhaust, it bolted to the intake manifold and tapped into the exhaust crossover allowing exhaust gases to recirculate back into the intake plenum. Easiest and quickest mod is to put small steel ball from carb kit into EGR vacuum line.

  37. That boats obviously unused, judging from the vines growing on it. Why not donate it ti me and I'll promise I'll put it to use. 😁😁😁

  38. Scotty, you are a total legend. Like your enthusiasm. Remind me of Peter Fonda from Easy Rider. Your vids are interesting. But dude, tidy your shed.

  39. This is why not to study mechanic while Scotty here. I saved thousands of euros by watching his videos. BTW, EGR is a bad for your car. Its same like your fart and breath under the planket. Loks like warm air, but with polution.

  40. Hi Scotty, it's maybe easy for you to forget that people watch your channel from all over the world, laws differ from country to country and what's illegal in one country is normal behaviour in another.

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