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Old 01-29-2019, 09:10 PM   #1
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Unhappy Motor revs while sitting still until brake is applied. Why?!

So my girlfriend and I just purchased a 2006 IC CE200 to convert into our first skoolie!...But when I start it just to let it idle or let it run to use the heat while working inside, the RPMs steadily crawl up until I hit the brake pedal. It drops back down to a normal idle, then a few minutes later, the RPM starts going up again until I hit the brake.

Is this normal? If not, what could be the issue?
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Old 01-29-2019, 09:20 PM   #2
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I have a truck that does that when it's cold outside.

The first time I noticed it, I had started the truck to let it warm up. I went back in the house and after a few moments I heard the engine start to speed up. My first thought was that someone was trying to steal my truck.....

The computer runs the idle speed up until I tap the brake, Just like you described. Once it is warmed up it behaves "normal".
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Old 01-29-2019, 11:20 PM   #3
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Quote:
Originally Posted by tracklesstrolley View Post
So my girlfriend and I just purchased a 2006 IC CE200 to convert into our first skoolie!...But when I start it just to let it idle or let it run to use the heat while working inside, the RPMs steadily crawl up until I hit the brake pedal. It drops back down to a normal idle, then a few minutes later, the RPM starts going up again until I hit the brake.

Is this normal? If not, what could be the issue?

Sounds like a cold weather warm up to me. Also some engines are programmed to do this to keep the coolant temperatures at operating range.


What engine do you have?
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Old 01-30-2019, 01:05 AM   #4
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One of the spare busses in our Schools Fleet does the same thing. It kind of freaked me out the first time I drove it, but I got used to it.

It does this in any weather.

Apparently it’s normal, as several years later it still does it.
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Old 01-30-2019, 07:41 AM   #5
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Ours does that too (2003 DT466E). I haven't waited to see how long it takes to go back to normal idle on it's own. I also tried flipping the High Idle switch but it doesn't do anything. Like the others said, this isn't a problem, just the way it works.
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Old 01-30-2019, 07:44 AM   #6
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weird. My 03 doesnt do that.
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Old 01-30-2019, 11:21 AM   #7
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weird. My 03 doesnt do that.
I have an '04 Cummins 5.9 that does it and an '02 Cummins 8.3 that does not.

Maybe it was a "new" feature around '03-'04?
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Old 01-30-2019, 03:38 PM   #8
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Mine does that if the cruise control is left on and its below freezing, otherwise not an issue. This is on a 2001 Dt 466E.
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Old 01-30-2019, 03:52 PM   #9
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I've got a 2002 Ford e450 that's been doing it. I read one website that stated if you hit the brake and it stops it's Regen. It is common in newer pickups and designed to burn of excess soot from a lot of idling. It will also complete the Regen process when highway driving. I figured it was put on school buses earlier because of all the idling they do. I have been letting my bus idle for long periods when working on it - for heat and a lot of stop and go driving so I figured that was it.
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