6.7 Cummins Throttle Valve Delete: How the Valve Works and Fails

Your Exhaust Gas Recirculation (EGR) system is off, the tune is loaded, and the truck should be pulling like a freight train. So why does it fall flat on its face the moment you lean on it? Before you blame the exhaust side, look at the intake.

Here's the thing — once the EGR comes off, the throttle valve is the easiest part under the hood to forget about. Take the EGR away and the valve has nothing left to do, yet it's still there and still able to close.^[1] That second half is the whole story.

Let's break it down: what the valve does on a stock truck, why a tune wants it unplugged, what happens when it closes on its own, and what goes in its place. Buckle up.

What Does the Throttle Valve on a Cummins Do?

The intake air throttle valve is located on the driver side of the motor underneath the intake by the intercooler pipe. To operate effectively and safely, the engine must continuously deliver air, fuel and lubrication to the cylinders.^[3] Determining the air mass reliably and accurately contributes to greater fuel combustion efficiency.^[2]

Where the valve sits

Pop the hood and look down the driver side. You're hunting below the intake, right beside the intercooler pipe.

It can be complicated to locate and "unplug" if you have never unplugged one before. Bring a good flashlight and a little patience, so you're not fighting it blind.

Why a diesel cares about its air supply

Think of the intake as your truck's windpipe. Pinch a windpipe and nothing downstream works right, no matter how strong the heart is. That's why a valve sitting in the air path deserves more of your attention than it usually gets.

So what is that valve actually doing in there on a stock truck? Let's look at the factory setup.

How Does the Stock EGR Setup Use the Valve?

The throttle valve opens and closes to adjust the ratio of fresh intake air to recirculated exhaust gas.^[1] The EGR system is water cooled, with the air reintroduced into the intake system.^[5] Variable geometry turbochargers offer versatile optimization across engine speeds and loads, aiding engine braking, exhaust gas recirculation and thermal management.^[4]

The valve and the recirculated gas

Picture the mixing faucet on the shop sink. Hot on one side, cold on the other, and one handle deciding the blend. On a stock truck, the throttle valve is that handle, setting the mix of fresh air and recirculated exhaust.^[1]

With the EGR in place, that makes sense.^[1] Hold that thought, because it's about to change.

How the cooled loop returns air to the intake

Here's the other half of that blend. The EGR system is water cooled, and the air it carries goes right back into your intake system.^[5]

So what happens to the valve that ran the blend once that air stops coming back? Hang on to that question for one more section.

Where the turbocharger fits

Variable geometry turbos help on the recirculation side too, along with engine braking and thermal management.^[4] Picture the turbo, the cooled loop and the valve as one crew on the same job site, all working the same airstream.

What Goes Wrong When the Valve Closes at the Wrong Time?

The valve can still move on its own and partially or fully close off the air supply.^[1] Under load, a closed valve can shut the engine down entirely or cause catastrophic damage at higher RPM.^[1] A valve left connected may stick closed, and the truck then will not run right or rev up.

A valve that moves by itself

If you've already deleted the Exhaust Gas Recirculation (EGR) system, the factory throttle valve is now a liability sitting in your intake tract.^[1] Your delete tune codes out its operation and the actuator gets left unplugged, and most of the time that's fine.^[1]

Most of the time is not every time. A valve only has to close once at the wrong moment to ruin your day.

What you notice from the seat

Now put that on a sled-pull truck, hooked to the sled and loaded down. That's the under-load moment when a closed valve can kill the engine outright.^[1] Leave the valve plugged in and it may stick closed, and then the truck won't run right or rev up.

Ever chased a problem like that through every sensor on the truck? Check the intake before you throw parts at it.

Airflow even when the valve is open

A lot of guys assume an unplugged valve is a harmless valve. Not quite. Even when it is open and unplugged, the stock valve obstructs smooth airflow through the intake.^[1]

It's like sprinting down a hallway with a door left half-shut. You get through, but never at full stride.

Why Does the Valve Get Unplugged Before a Tune Goes On?

The Air Intake Throttle Valve (AITV) must be unplugged before installing tunes. If the tune is already installed and the AITV is connected, the fix is to unplug it and re-flash the tune. The valve stays unplugged indefinitely and is never plugged back in.

Unplug first

Order of work matters here. Unplug the valve first, then load the tune. Get it right up front and you're not doing the job twice.

If the tune is already on

Already flashed the truck with the valve still plugged in? We get it, it happens. Pull the connector, re-flash the tune, and you should be good to go. Once it's unplugged, keep it that way for good.

What the control unit decides

Why does the tune care what the valve is doing? The engine control unit manages all requirements for the engine, prioritizes and then implements them.^[2] Torque serves as the key criterion for every one of those requirements.^[2]

The electronic engine control unit is the central controller of the engine management system and controls the fuel supply, air management, fuel injection and ignition.^[2] The air-fuel ratio is regulated so the torque is delivered as efficiently as possible.^[2]

Air management sits right on that list, so the tune and the throttle valve were never strangers. Think of the control unit as the foreman: if one guy on the crew isn't hearing the radio, the whole job goes sideways.

What Does a Throttle Valve Delete Kit Replace?

The Throttle Valve Delete replaces the factory throttle valve with a fixed, open plate.^[1] That leaves a smooth, unobstructed passage with no actuator and no moving parts.^[1] The delete pairs with any EGR delete tune that codes out throttle valve operation.^[1] Fits 2007.5 through 2024 Dodge Ram 2500 and 3500 with the 6.7L Cummins.^[1]

What the fixed plate does

Swap a swinging gate for an open doorway, and nothing in the way gets a vote on whether air comes through. The plate leaves a smooth, unobstructed passage with no actuator and no moving parts.^[1] That's the whole point of the part.

Not sure whether your tune codes the valve out? Call us at (888) 830-2588 and we'll confirm before you install.

Which trucks the kit fits

Fitment is where good builds go sideways. Which side of that line does your Ram fall on? Check the build year and the model against what the kit fits before anything comes off the engine.

Which Model Years and Ratings Does the 6.7 Cummins Cover?

Cummins engines have been an option in RAM pickups since 1989.^[7] The 6.7-liter Cummins engine was to be available in 2007 Dodge Ram 2500 and 3500 models beginning January 2007.^[5] Ram was the first to achieve the 1,000 lb.-ft. of torque milestone with the Cummins I-6 Turbo Diesel, now rated at 1,075 lb.-ft. of torque.^[6]

From the first Cummins Ram to the 6.7

That's a long partnership. It also means the 6.7 you're wrenching on could come from a lot of different model years. Know yours before you start pulling parts.

Mid-range model years

The Model Year 2018 Cummins 6.7L Turbo Diesel engine is a featured option for 2018 RAM 2500 and 3500 pickups.^[8] Got one of those on the dyno? Then you already know what kind of workhorse we're talking about.

The latest ratings

The 6.7-liter Turbo Diesel advanced engine system and powertrain will be offered in the 2025 Ram 2500 and 3500 Heavy Duty pickups.^[10] Nearly 70% of all Ram 2500 and 3500 Heavy Duty pickup owners choose the Cummins Turbo Diesel as their powertrain of choice.^[9]

That's not a niche engine — it's the workhorse most heavy-duty Ram owners pick.^[9] Pair that with 1,075 lb.-ft. and you've got insane torque from an inline-six.^[6] Built like a tank, too.

Where Does the Intake Heater Sit in the Air Path?

The Wait To Start light remains on to indicate that the intake manifold heater system is active.^[11] If the engine stalls, the grid heaters are reset by turning the ignition switch to the OFF position for at least five seconds and then back ON.^[11]

Reading the Wait To Start light

Cold morning at the event, and the truck sat on the trailer all night. The name tells you where the heater lives: it's the intake manifold heater system, and that light is telling you it's active.^[11] In cold ambient temperature conditions, the diesel vehicle may delay crank up to 30 seconds for the fuel and grid heater.^[11]

Let it finish before you crank. Rushing a cold diesel never won anybody a round.

Resetting the grid heaters

Stalled it? Here's the reset: turn the ignition switch to OFF for at least five seconds, then back ON.^[11] No tools, no laptop, just the key.

The two Monster-Ram upgrades

Want the intake and the heater handled as one upgrade? Pick the version that matches your truck's model years.

#### 2013-2018 Dodge Ram 6.7L Cummins | Monster-Ram® Intake + Heater Upgrade

Your install day stays in the garage, not in the parts aisle. Includes proprietary fuel line and all hardware^[12]

#### 2019-2024 Dodge Ram 6.7L Cummins | Monster-Ram® Intake + Heater Upgrade

Here's what matters on the newer trucks. Accommodates stock mounting points^[13]

How the pieces fit together

Variable Geometry Turbochargers work by varying the exhaust passage area before the exhaust gas enters the turbine wheel.^[4] The new Cummins engine uses improved intake port geometry for top feed injectors, top load lubrication and integrated fuel filters.^[14] In diesel engines, internal combustion results in expansion of high-temperature, high-pressure gases, which in turn move pistons.^[3]

Turbocharger to intake

Varying that passage raises the pressure and velocity of the exhaust gas, which boosts pressure and airflow to the engine as needed.^[4] Every bit of that boost still has to make it through the intake tract. That's where a valve that can close turns into a choke point, and an open plate turns into a straight shot.

Intake to cylinder

On the new engine, the intake ports themselves got a better shape.^[14] It also picked up a new performance intake manifold, a new turbo and larger intake and exhaust valves for improved port flow.^[14] Each injector then sprays its fuel so it builds a homogenous mixture with the air coming in.^[2]

Air in, fuel in, pistons moving. That's chemical energy turned into mechanical energy.^[3] Anything that pinches the air weakens every link in that chain.

Where to read more

Want the full picture of the engine behind all this? The latest generation Cummins 6.7L Turbo Diesel is a heavy-duty pickup engine that delivers the power, quietness, cold-weather reliability and serviceability that truck owners depend on.^[15] Start with the air path, and the rest of the build makes sense for the long haul.