If you're looking to squeeze a bit more life and reliability out of your old Toyota engine, doing an egr delete 22r is usually one of the first things people talk about on the forums. The 22R and 22RE engines are legendary for their durability—they're basically the cockroaches of the automotive world—but even the best engines have parts that eventually start causing more trouble than they're worth. The Exhaust Gas Recirculation (EGR) system is often at the top of that "trouble" list.
Now, before we get too deep into the weeds, let's talk about why this is even a thing. If you've ever pulled the intake manifold off a 22R that's been running for twenty or thirty years, you know exactly what I'm talking about. It's usually caked in a thick, black, oily soot that looks like someone poured driveway sealer down the throat of your engine. That's the EGR system doing its job, but at a cost to your engine's long-term cleanliness.
What is This System Actually Doing?
To understand why people want to perform an egr delete 22r, you have to understand what the system was designed for in the first place. Back in the day, engineers needed a way to lower nitrogen oxide (NOx) emissions. Their solution was to take a portion of the hot, spent exhaust gases and pipe them back into the combustion chamber.
The idea sounds a bit counterintuitive—why would you want to put dirty air back into your engine? The logic is that these inert gases lower the combustion temperature, which in turn reduces the formation of NOx. While it works for emissions, it's not exactly a "performance" feature. In fact, it's basically making your engine breathe its own farts. Over time, those exhaust gases carry carbon and oil mist into the intake, where they solidify into that nasty gunk I mentioned earlier.
The Biggest Reasons People Go for the Delete
Most guys who decide to go through with an egr delete 22r aren't doing it just because they're bored on a Saturday. There are some real, tangible benefits to getting rid of all that extra plumbing under the hood.
1. Cleaning Up the Intake
This is the big one. When you stop pumping soot into your intake manifold, everything stays cleaner. Your valves stay cleaner, your intake runners don't get restricted, and you don't have to worry about carbon chunks breaking off and causing issues. It's about longevity. A clean engine is a happy engine, and the 22R is an engine that deserves to run for another 300,000 miles.
2. Simplifying the Engine Bay
If you've ever looked at a stock 22R engine bay, especially the later California emissions models, it's a total "vacuum line nightmare." There are hoses going everywhere, vacuum switching valves (VSVs) tucked into every corner, and a maze of hard lines. Doing an egr delete 22r allows you to strip away a significant amount of that clutter. It makes the engine much easier to work on, and there are fewer places for vacuum leaks to hide—and we all know how much a 22R hates a vacuum leak.
3. Better Throttle Response
I won't lie to you and say you're going to gain 20 horsepower. You won't. But many drivers report that the truck feels "snappier" off the line. By ensuring the engine is only pulling in fresh, cool air and fuel, you get a more consistent combustion cycle. It's a subtle difference, but if you've been driving the same Toyota pickup for a decade, you'll notice the improvement in how it reacts when you step on the gas.
The Potential Downsides (The Stuff People Forget)
It's not all sunshine and rainbows, though. There are a few things you need to consider before you start ripping parts off your truck. First and foremost is the legal side. In many places, tampering with emissions equipment is technically for "off-road use only." If you live in an area with strict smog testing, an egr delete 22r will likely cause you to fail your visual inspection or your tailpipe test.
Another thing to watch out for is pinging or detonation. Remember how I said the EGR lowers combustion temperatures? When you remove it, those temperatures can climb. In some cases, especially if your timing is advanced or you're running cheap, low-octane gas, the engine might start to "knock" or "ping" under load. Most of the time, you can tune this out by adjusting your timing or switching to a slightly higher grade of fuel, but it's something to keep in mind.
What You Need for the Job
If you've weighed the pros and cons and decided to move forward, you'll need a few things. You can't just pull the valve off and leave a hole in your manifold. You'll need a set of block-off plates. These are usually thick pieces of steel or aluminum designed to bolt directly over the ports where the EGR valve and the exhaust manifold tube used to live.
The kit usually includes: * A plate for the back of the cylinder head or the intake manifold. * A plate for the exhaust manifold. * Fresh gaskets or a tube of high-temp RTV. * Plug caps for the vacuum ports you'll be abandoning.
If you're working on a 22RE (the fuel-injected version), you might also need a resistor for the wiring harness to keep the "Check Engine" light from staring you in the face. The 22R carbureted models are a bit simpler in this regard since they don't have a computer that's quite as "nosy" about what the emissions system is doing.
Is It Worth the Effort?
At the end of the day, an egr delete 22r is one of those modifications that falls into the "maintenance and simplification" category rather than the "racing" category. If your EGR valve is already stuck open and making your truck idle like a bag of hammers, or if your vacuum lines are dry-rotted and leaking, a delete is often cheaper and easier than trying to fix the old system with expensive OEM parts.
It's about making the truck yours. These Toyotas are built to be simple, rugged, and dependable. By removing a system that was essentially an afterthought added to meet 1980s emissions standards, you're returning the engine to a more "pure" state. You get a cleaner intake, a simpler engine bay, and a truck that's just a little bit easier to live with on a daily basis.
Just make sure you do your homework on your local laws and keep your old parts in a box in the garage—just in case you ever need to put it back to stock. But for most Toyota enthusiasts, once those block-off plates go on, they never look back. It's just one of those classic mods that has stood the test of time, much like the 22R engine itself.
Whether you're building a rock crawler, a farm truck, or a nostalgic daily driver, taking care of the small things like an egr delete 22r can make a world of difference in how your old Toyota performs over the next hundred thousand miles. It's all about keeping these old legends on the road and running as smoothly as possible.