If you've been staring at that messy intake manifold and wondering if a 22re egr delete is actually worth the trouble, you're definitely not the only one. The Toyota 22RE is a legendary engine, found in some of the most iconic Hiluxes and 4Runners ever made, but it's also famous for having a vacuum system that looks like a bowl of angry spaghetti. Between the rats' nest of hoses and the decades of carbon buildup, pulling the Exhaust Gas Recirculation (EGR) system is one of the most common "driveway mods" people talk about.
But before you go grabbing the wrenches and ripping out copper lines, it's worth looking at what this actually does for your truck—and what it might mess up.
Why people bother with an EGR delete
The main reason anyone looks into a 22re egr delete is simplicity. If you've ever tried to change your spark plugs or adjust your valves on a stock 22RE, you know that the EGR valve and its associated plumbing are always in the way. It's a bulky, awkward piece of equipment that sits right on the back of the cylinder head, making an already tight engine bay feel even more cramped.
Beyond the aesthetics and the "reach-ability" of your engine parts, there's the issue of gunk. The whole point of an EGR system is to take a portion of your exhaust gases and shove them back into the intake manifold. The goal is to lower combustion temperatures to reduce Nitrogen Oxide (NOx) emissions. While that's great for the environment, it's not exactly great for your intake. Over 20 or 30 years, that oily exhaust mist mixes with the fine dust that gets past your air filter, creating a thick, black sludge that coats the inside of your intake plenum. It can eventually restrict airflow and make the engine run like it's breathing through a wet sock.
Does it actually help performance?
This is where things get a bit heated in the forums. If you're expecting a 22re egr delete to turn your old 22RE into a fire-breathing race engine, you're going to be disappointed. We're talking about an engine that makes maybe 112 horsepower on a good day. Removing the EGR isn't going to give you a noticeable "seat-of-the-pants" power boost.
However, there is a technical benefit. By removing the system, you're no longer pumping hot exhaust gases back into your intake charge. Cooler air is denser air, and denser air generally means better combustion. You might notice the throttle feels a little crisper, and the engine might idle a bit smoother once you've cleared out all those potential vacuum leaks. Most of the "performance gain" people report is actually just the engine finally running correctly because they fixed a dozen tiny vacuum leaks that were hiding in the old EGR hoses.
The downside: Pinging and heat
It's not all sunshine and clean intake manifolds, though. Toyota didn't put that system there just for fun. Because the EGR lowers combustion temperatures, removing it can lead to higher temps inside the cylinders when you're cruising at highway speeds.
On a 22RE, the biggest risk of a 22re egr delete is "pinging" or engine knock. When the cylinder gets too hot, the fuel can ignite before the spark plug even fires. This sounds like marbles rattling in a tin can, and it's really bad for your pistons and head gasket over time. If you do delete your EGR, you might find that you have to run higher octane fuel or slightly retard your ignition timing to keep the engine happy. It's a trade-off: you get a cleaner engine bay, but you might have to spend more at the pump or fiddle with your distributor.
What you need for the job
If you've decided to go through with it, you can't just pull the hoses and call it a day. You'll end up with a massive vacuum leak and an engine that won't even start. A proper 22re egr delete requires a few specific parts.
Block-off plates
You'll need two metal plates: one to cover the hole on the back of the cylinder head where the EGR pipe starts, and another for the spot on the intake manifold where the valve sits. You can buy these online for twenty bucks, or if you're handy with a grinder, you can make them out of some scrap steel. Just make sure you use a good gasket or some high-temp RTV silicone to get a perfect seal.
Vacuum caps
Once the valve is gone, you'll have several ports on the throttle body and the vacuum gallery that are suddenly open to the air. You'll need a handful of rubber vacuum caps to plug these off. If you leave even one open, your idle will be all over the place.
The 10k Ohm resistor trick
This is the part that trips people up. On later 22RE models (mostly 1988 and up), the computer (ECU) looks for a temperature sensor on the EGR valve. If you just unplug it, the "Check Engine" light will stay on forever. Most guys fix this by sticking a 10k ohm resistor into the plug on the wiring harness. This tricks the ECU into thinking the EGR is there and working perfectly, keeping that annoying orange light off your dashboard.
The legal side of things
We have to talk about the elephant in the room: emissions testing. In many states and countries, tampering with your emissions equipment is technically illegal for street-driven vehicles. If you live somewhere like California with strict smog checks, a 22re egr delete is a one-way ticket to failing your inspection. The inspectors will look for the valve, see the block-off plates, and fail you before they even hook up the tailpipe sniffer.
Even if you don't have visual inspections, your NOx levels will likely go up, which could cause a tailpipe fail. Always check your local laws before you start pulling parts off. For a trail-only rig or a farm truck, it's a non-issue, but for your daily driver, it's a gamble.
Is it worth the effort?
At the end of the day, a 22re egr delete is really about simplifying your life under the hood. It makes the engine easier to work on, removes a dozen points of failure in the form of old, cracked rubber hoses, and keeps your intake from getting clogged with carbon.
If your current EGR system is working fine and you don't mind the clutter, there isn't a huge reason to mess with it. But if your valve is stuck, your hoses are dry-rotted, and you're tired of chasing vacuum leaks, deleting it can be a great way to "clean up" your Toyota. Just be prepared to keep an ear out for engine knock and maybe buy a better grade of gas. The 22RE is a tough old bird, and as long as you keep it cool and timed correctly, it'll keep chugging along for another few hundred thousand miles, with or without that EGR valve.