Cummins High Idle on Its Own

Cummins high idle on its own is an issue that can occur in Cummins engines. This issue is caused by a malfunctioning speed control circuit, which causes the engine to run at higher RPMs than it should. The most common cause of this problem is a defective accelerator pedal position sensor, or APPS.

Other possible causes include faulty wiring and connectors, sticky throttle linkage, vacuum leaks, and improper adjustment of the governor spring tension. To resolve this issue, you must first identify and fix the root cause before resetting the idle speed to its proper setting using appropriate tools such as diagnostic scanners or manual adjustments with the help of service manuals.

Cummins high idle is an often misunderstood feature, but it can be a great tool to use when you need your engine to run at a higher speed. With Cummins high idle engaged, the RPMs will increase automatically when necessary in order to provide increased power and torque for tough jobs or heavy loads. This feature can also help reduce fuel consumption by allowing the engine to operate more efficiently while idling.

Knowing how and when to use this option could make all the difference in getting the most out of your Cummins engine.

2016/2017 Cummins high idle

Why Does My Diesel Randomly High Idle?

Diesel engines are designed to meet certain standards of performance and efficiency, but sometimes they can exhibit unexpected behaviors. One common issue is random high idling. High idling occurs when a diesel engine runs at a higher speed than it should for the current operating conditions.

This can be caused by several factors, including an incorrect idle adjustment, poor fuel quality or contamination in the fuel system, worn out parts like injectors or glow plugs, vacuum leaks in the intake manifold, air filter problems, faulty wiring or sensors that affect engine timing, and even foreign objects lodged inside the intake manifold. To diagnose this problem correctly and prevent further damage to your vehicle’s engine components it’s important to have it inspected by a qualified professional who has experience with diesel engines. They will be able to determine what is causing your high idle and suggest solutions so you can get back on the road safely and quickly!

What Should Cummins Idle At?

Cummins engines are designed to run at an idle speed of just over 600 revolutions per minute (RPM). This is the ideal level for most Cummins engines, and it is important to ensure that the engine stays in this range. If you find your Cummins engine idling too fast or too slow, then there are several things you can do to adjust the idle speed back into its normal range.

First, check all of your vacuum lines and make sure they’re properly connected and not clogged. Next, replace any worn out spark plugs or air filters. Finally, if necessary, have a professional mechanic take a look at your engine and fine-tune it so that it runs correctly at an idle RPM of around 600 RPM.

Making sure that your Cummins engine idles correctly will help keep your vehicle running smoothly and efficiently for many years to come!

How Do You Put a Cummins in High Idle?

Putting a Cummins engine into high idle is a relatively simple process. First, you will need to make sure that the engine is shut off and the key removed from the ignition. Next, locate the throttle cable on the side of your engine’s intake manifold.

It should be connected directly to your accelerator pedal inside of your vehicle’s cab. Once located, carefully pull back on the throttle lever until it reaches its maximum position; this will engage your Cummins into high idle mode. You may also have an override button or switch somewhere near where you found the throttle cable; if so, press down gently on it to activate high idle mode as well.

Finally, turn your key in the ignition and allow your Cummins motor to settle at its new higher rpm level before driving away.

Do 24V Cummins Have High Idle?

The answer to the question of whether 24v Cummins engines have high idle is yes. In fact, it is one of the unique features that sets these powerful diesel engines apart from other options on the market. The higher than normal idle speed ensures that all engine components stay properly lubricated and at optimal temperatures even when not in use.

Furthermore, this feature allows for quicker response times when a load is applied and also helps reduce fuel consumption as well as emissions due to reduced warm up times. This makes them an ideal choice for those looking for a reliable, efficient power source with plenty of torque and power output capabilities.

Cummins High Idle on Its Own


6.7 Cummins High Idle in Park

The 6.7 Cummins High Idle in Park feature is a great tool for those who often idle their engine when parked. This feature allows the engine to operate at a higher RPM level than usual while in park, allowing you to keep your truck warm during cold weather or run an auxiliary device without having to worry about overworking the engine. With this useful feature, you can enjoy improved fuel efficiency and reduced wear on your vehicle’s components which makes it a great value addition for any driver who frequently idles his/her truck.

Cummins 5.9 High Idle Problem

The Cummins 5.9 engine is known for its reliability and durability, but it can have a high idle issue that can cause problems if not addressed. This problem can be caused by a faulty IAC valve, stuck throttle plate, or vacuum leak. If the idle speed is too high it can put extra strain on the engine and other components such as belts and pulleys which will reduce their life expectancy.

It’s important to address this issue quickly in order to maintain your engine’s longevity and avoid costly repairs down the road.

6.7 Cummins High Idle With Exhaust Brake

The 6.7 Cummins High Idle with Exhaust Brake is an advanced feature of the Cummins engine that allows drivers to maintain a higher idle speed while using their exhaust brake for better braking performance and improved fuel economy. This feature is particularly useful when driving on steep inclines or in stop-and-go traffic, as it reduces the amount of time and effort needed to slow down and accelerate back up again. Furthermore, the high idle helps reduce noise levels, ensuring a quieter ride overall.


To conclude, a high idle on its own can be caused by a few different issues with the Cummins engine. The most common cause is an air leak in the intake manifold or turbocharger, but other possible causes are fuel problems, ECM programming errors, and faulty sensors. If any of these issues arise with your Cummins engine’s high idle, it is important to identify and repair them as soon as possible to prevent further damage from occurring.


  • Zayn

    John Zayn Smith is a renowned truck enthusiast, automotive industry expert, and author. Beginning his career as a mechanic, Zayn's curiosity led him to explore all facets of the trucking world, sharing his insights through in-depth articles on His knowledge spans truck mechanics, trends, and aftermarket modifications, making him a trusted resource for both professionals and hobbyists. Outside writing and mechanics, Zayn enjoys off-roading, truck shows, and family time. Follow his work for the latest in truck-related news and tips.

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