Cummins 3 cylinder high idle

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Another benefit is that it helps warm your RV or truck up faster on cold mornings. Then keep it warm because you are still getting plenty of hot air in the cab as it idles. We have not seen anything that says, this device is bad for a diesel engine. The reason for that is that diesel fuel needs to burn at higher temperatures. The high idle helps to do just that. You may not need this device as it may be a novelty than a must-have device. There are many diesel owners that do not use it nor want to have it installed on their vehicle.

You should hear different opinions on this as well. What makes this discussion confusing is that there are so many older diesel engines still on the road today. What their requirements are is different from what modern diesel engines require.

In this modern era, the ideal idle rate is about RPM. This keeps the oil pressure where it should be. Anything lower will also lower the oil pressure which may eventually harm the engine. Some people say that a diesel engine needs to idle at to RPM and anything lower is not good for it. But that may be for the older diesel engines. If you are not sure after reading this, talk to a trusted diesel mechanic.

Get the straight story from those who know these engines the best. There are different reasons for this scenario. One is that you may have set or had your mechanic set the idle air control valve too high. This is usually operated by a screwdriver and someone may have turned it a little too far. Just get another screwdriver and with the engine on, lower the idle speed by turning that screw slightly. Another reason is that the transmission is no longer engaged.

Once you put the gear shift into park you are removing resistance which makes the engine work a little easier and faster. Or your air control valve is dirty or clogged.

This keeps it open at a higher level and it just needs a good cleaning to close it again. A final reason is that your oil is low and you need to add more or your air filter is dirty and needs to be replaced. All of these reasons can influence how fast your engine idles when you are not driving. This is a device that has been on all Dodge trucks since about But it is not an automatic start device.

It has been said that you need the dealer to turn it on first before you can use it. There is a special screw that operates the high idle switch and many people do not own that screwdriver.

Once activated, then you simply use your cruise control device to turn it on. After doing that, then you should see your Dodge truck idle at about RPM, which is high enough to keep that oil pressure up there and burn all the diesel fuel.

It may be best to talk to your dealer about this. They will be able to tell you how to use it correctly as well as when you should use this device. One thing is for sure, it is not meant to be used when you are at a stop sign or stop light. There would be no power to drive with. But that does not mean you cannot take advantage of this feature. What the 3-cylinder mode does is loads the engine, making it work thus creating more heat.

This mode only operates after 2 conditions are met. The first condition is that the intake air temperature is below 15 degrees F. The second condition is that the coolant temperature is below degrees F. I just don't want to tear the engine up. I would think that if Cummins included this in the software that it would be ok to use, after all they are the experts.

It uses I think the front 3 cylinders, it doesn't switch them. The injectors cease to fire on the last 3. It really doesn't wear anything more than the others I wouldn't think, I mean all 6 pistons are still moving.

The fact that the front 3 have to drive the back 3 is actually why it helps heat the engine up. No need to have the high idle activated if you are going with a fooler. There is no issue with wear, it just causes an artificial load on 3 cylinders to create more cylinder heat to warm things up a bit faster, It will only be activated under a certain temp and will kick out to just an elevated idle at a certain temp.

Yeah the software is already present on all 24V As for the wear factor The 3 dead cylinders are 1,2,3 and the 3 firing cylinders are 4,5, As for wear there is none because the 1,2,3 are just pumping air no fuel is injected at all. So these dead cylinders create a virtual loading of the engine causing the engine to warm up rapidily I learned something new today I thought the fooler was a forced Fast idle, I didn't think it needed to be enabled also.

Only needs a couple minutes to get cylinder temps up to drive it safely and easy for a couple miles. If you want hot air in the cab install an in cab heater. Or find a woman to ride with you.

Foolers are nice becuase you can trip the 6cyl fast idle for extended idling, or during periods of high amp draw, or to cool the motor quicker. I use the OE fast idle on my truck all the time. Cummins released a brochure that stated the engines should be driven sooner rather than later when cold. Let it get good oil pressure, run for 30 or so seconds if really cold and drive away is the best thing you can do for your motor. Now thats generally what I do, but depending on what I am doing taking the kids out, up and down the road at elk camp, etc I will let it warm up first for some comfort.

But I prefer to let it get warm with 90 minutes of block heater and drive off. I also don't like using the exhaust brake on a cold motor, I am pretty sure it puts tons of soot into the oil based on UOA. I think it helps the rings seal and gets the combustion temps up.

Thanks all for the info. Then I'll start saving for a fooler. Any other recommendations for a new diesel owner?

Full set of gauges That is on my x-mas list. I wasn't going to get trans.

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I actually do not want this feature. Is there a simple way to disable the three cylinder high idle? I would be happy to have no high idle, but a six cylinder high idle would be acceptable. Can either modification be done and how would you do it? I fired my truck up at a slushy 17deg the other morning. Did not notice a different idle with smarty on board.

Mine didn't ramp up to 3 cylinder high idle until 2 or 3 minutes after the engine was started. I am going to try to figure out a way to fool the software into eliminating the 3 cylinder high idle. I did notice that once I depressed the clutch pedal or touched the throttle, the feature was immediately disabled. Personally, I don't think so.

In the past I have just used the exhaust brake at regular idle and the engine warms quickly. And, it is certainly much quieter. It puts a good load in the motor to prevent the coking on the valves. The 24v's flow so much air at idle it cools the head off at an idle when it's cold. Watching the engine struggle to warm up while it wet stacks is like asking for issues with bent push rods. In the cold temps I put a cardboard in front of the radiator that blocks all air. I'm running it folded in half right now.

Your should not be doing that. That cardboard thing can make things worse. I still use my winter front I made from the lexan from years ago that fits in the grill.

What tstat are you running? I drove in one time truck running a fuzz over this was consistent temp for miles. Windshield icing over inside and out. Was running a heater in the truck and not running any heat of own. This is when I started blocking radiator.

Night day warmer gas station lady looks at me with questioning look ad I beg for a big cardboard box. I run a in my truck and I haven't seen any issues with that yet. Too cold. Need at least the F thermostat. I'm wanting to go back to a F thermostat as well. Please take the time and give the author a 1 to a 5-star rating for the information you have gained from anywhere on the website.

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Existing user? Sign in with Facebook. Quadzilla Tunes. Three cylinder high idle. Share More sharing options Not everyone uses this feature. The high idle feature is there to help prevent wet stacking. This is where the cylinder temperature is not high enough to burn all the fuel.

That unburnt fuel then slides down into the oil pan diluting the oil and in turn creating excessive engine wear.

To learn more about high idle and what it is used for, just continue to read our article. It has the information you want to know about so you can use this feature at the best possible times. You do not need it at a red light or a short stop on the side of the road. It is usually operated through your cruise control on the left side of the steering wheel.

To use the high idle, you need to set your parking brake, do not touch the gas or the brake pedals, and your vehicle cannot be moving. Before you get going again, do not forget to shut the high idle switch off. You do this by pressing the brake, pushing the cancel button, releasing the parking brake, or you shift out of park or neutral. You will get differing opinions on this switch. Some people do not see the need for it while others think it is the perfect addition to a diesel engine.

It is up to you to decide which side of the debate you are on. If all the diesel fuel is not burnt up in the cylinder then it can mix with the oil. When that happens the oil brings the fuel into the oil pan, diluting it. Once the oil gets diluted, you have less lubrication available and your engine can wear out faster. No, it is not.

It is a device that has many benefits to it. Two are as already mentioned above. It is to protect your engine from any possible damage that can be done by not completely burning the fuel. Another benefit is that it helps warm your RV or truck up faster on cold mornings. Then keep it warm because you are still getting plenty of hot air in the cab as it idles. We have not seen anything that says, this device is bad for a diesel engine. The reason for that is that diesel fuel needs to burn at higher temperatures.

The high idle helps to do just that. You may not need this device as it may be a novelty than a must-have device. There are many diesel owners that do not use it nor want to have it installed on their vehicle.

You should hear different opinions on this as well. What makes this discussion confusing is that there are so many older diesel engines still on the road today. What their requirements are is different from what modern diesel engines require. In this modern era, the ideal idle rate is about RPM. This keeps the oil pressure where it should be.

Anything lower will also lower the oil pressure which may eventually harm the engine. Some people say that a diesel engine needs to idle at to RPM and anything lower is not good for it. But that may be for the older diesel engines. If you are not sure after reading this, talk to a trusted diesel mechanic.

Get the straight story from those who know these engines the best. There are different reasons for this scenario. One is that you may have set or had your mechanic set the idle air control valve too high. This is usually operated by a screwdriver and someone may have turned it a little too far.

Just get another screwdriver and with the engine on, lower the idle speed by turning that screw slightly.

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