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Old 03-07-2018, 07:18 PM   #1
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A couple questions that hopefully you experts can assist with. I just brought my MH home from a Freightliner service center. I took it in for a small oil leak which they troubleshot to an engine rear main seal leak. The funny part is they sent me away to find a Cummins service center because they did not have the capability to do the work
Question 1: What is meant when they say to maintain the torque with the engine RPM? I do not understand this.

Question 2: After a 1 hour drive home with dash AC running, I stopped at my house, put the tranny in neutral with brake set. I notice RPM was up to about 1100-1200 RPM. The engine temp was a little over a quarter( blue range). It continued to idle high for about 5 minutes until I decided not to wait any more for the idle to come down. When I pressed on the brake pedal, it dropped back down to idle. Is this normal? Any ideas?
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Old 03-07-2018, 07:30 PM   #2
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We need more details. Age, model, engine size, mileage all clues are helpful
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Old 03-07-2018, 07:32 PM   #3
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If you look online for information about your engine, you'll find a line graph showing RPM and torque. You should learn to keep the engine RPM in the power range of the most torque. Sometimes on a long gradual hill, your RPMs will drop and so will the torque. The engine is actually 'lugging' and building up heat. In those conditions, it's best to manually downshift to raise RPM and get in a better torque range. On a hill, I pay more attention to RPM and engine temperature than I do MPH.

It sounds like your engine was at fast idle to cool itself down. I can set a fast idle with my cruise control to build up air pressure and trigger it off by touching the brake. Sounds like your ECU was doing the same thing after driving it. Never come off the interstate and immediately shut down the engine, let it run at fast idle for 5 minutes to get rid of the heat built up in the turbo. To shut down while hot can actually 'cook' the oil in the turbo bearings and damage it. You don't ride a horse and put it up 'wet.' Same for your diesel.
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Old 03-07-2018, 07:34 PM   #4
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It continued to idle high for about 5 minutes until I decided not to wait any more for the idle to come down. When I pressed on the brake pedal, it dropped back down to idle. Is this normal? Any ideas?
Check to see if you still had your cruise control still on...
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Old 03-07-2018, 07:39 PM   #5
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Check to see if you still had your cruise control still on...
X2 sounds a bit like a high idle from the cruise control setting, when it disengaged after they hit the brake, it made sense to me.
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Old 03-07-2018, 07:56 PM   #6
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I'm sorry. 2018 380 ISL Cummins with Allison 3100 tranny. 2100 miles. I drove 3 miles at 35 MPH after coming off the interstate.
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Old 03-07-2018, 08:09 PM   #7
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Quote:
Originally Posted by Dfreiberger View Post
A couple questions that hopefully you experts can assist with. I just brought my MH home from a Freightliner service center. I took it in for a small oil leak which they troubleshot to an engine rear main seal leak. The funny part is they sent me away to find a Cummins service center because they did not have the capability to do the work
Question 1: What is meant when they say to maintain the torque with the engine RPM? I do not understand this.

Question 2: After a 1 hour drive home with dash AC running, I stopped at my house, put the tranny in neutral with brake set. I notice RPM was up to about 1100-1200 RPM. The engine temp was a little over a quarter( blue range). It continued to idle high for about 5 minutes until I decided not to wait any more for the idle to come down. When I pressed on the brake pedal, it dropped back down to idle. Is this normal? Any ideas?
On mine if I push the cruise control button when it is idling it increases to a faster idle as you describe and then goes back to normal if I touch the brake. This is a purposeful feature to allow more engine RPMs for functions like air pressure, etc. Maybe you came off and accidentally hit the cruise button when it was sitting at idle??? Go test it. It is supposed to work that way.
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Old 03-08-2018, 03:02 PM   #8
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My 2018 380 hp ISL does the exact same thing. I'm trying to idle down for a minute or two, and it goes up to high idle, cruise control on or off. I'm a firm believer that my intention is to cool down to stabilize temps, going up to high idle is not the way to do it. I've released the parking brake and held the service brake to prevent the high idle from coming on during this situation. Kind of drives me nuts, some sort of programming I assume.
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Old 03-08-2018, 03:10 PM   #9
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Old 03-08-2018, 03:34 PM   #10
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X2 sounds a bit like a high idle from the cruise control setting, when it disengaged after they hit the brake, it made sense to me.
The cruise control would have been canceled when touching the brakes and wouldn't (shouldn't) re-engage on its own. I suspect the high idle is triggered by the ECU and perhaps the turbo temperature.

I'd think a quick call to a Cummins garage should tell if this is proper behavior or a problem.
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Old 03-08-2018, 03:37 PM   #11
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I know this was not your question, but what do you think of the beeping alarm that goes off when in neutral and parking brake is not set? It bugs me a bit, seems to be overkill. I've driven Allison equipped fire apparatus for 30+ years, and none of them do that. Fire trucks have alarms for every situation, but no beeper for parking brake not set. Is that a Tiffin thing or possibly Freightliner chassis operation?
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Old 03-08-2018, 03:42 PM   #12
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I know this was not your question, but what do you think of the beeping alarm that goes off when in neutral and parking brake is not set? It bugs me a bit, seems to be overkill. I've driven Allison equipped fire apparatus for 30+ years, and none of them do that. Fire trucks have alarms for every situation, but no beeper for parking brake not set. Is that a Tiffin thing or possibly Freightliner chassis operation?
RVs aren't driven by professionally trained drivers. (usually) The RV could roll if no parking brake set and in neutral. Yes, cars could too, but perhaps the alarm helps to make things safer. In a car, you'd have to open the door (alarm might sound) in an RV driver could be getting up to go to the restroom or fridge, no exterior door opened.

If the alarm bothers you, don't leave the parking brake off, or put duct tape over the buzzer and reduce the volume of the alarm.
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Old 03-08-2018, 03:51 PM   #13
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I know this was not your question, but what do you think of the beeping alarm that goes off when in neutral and parking brake is not set? It bugs me a bit, seems to be overkill. I've driven Allison equipped fire apparatus for 30+ years, and none of them do that. Fire trucks have alarms for every situation, but no beeper for parking brake not set. Is that a Tiffin thing or possibly Freightliner chassis operation?
I appreciate the alarm for safety reasons.
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Old 03-08-2018, 04:06 PM   #14
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RVs aren't driven by professionally trained drivers. (usually) The RV could roll if no parking brake set and in neutral. Yes, cars could too, but perhaps the alarm helps to make things safer. In a car, you'd have to open the door (alarm might sound) in an RV driver could be getting up to go to the restroom or fridge, no exterior door opened.

If the alarm bothers you, don't leave the parking brake off, or put duct tape over the buzzer and reduce the volume of the alarm.
I can go along with that. I pulled into a rest area years ago behind another coach. All of a sudden he started rolling back into my coach. I could not get started and out of the way in time. Punched a hole in the front of my coach.
He had stopped, jumped up to use the bathroom and forgot to set the park brake.
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