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Old 03-09-2015, 09:30 PM   #1
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Cummins ISX 600 HP Idling RPM?

My 08 Affinity is idling at around 500 rpm. In a way I like it because it isn' very loud, but isn't it too low?
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Old 03-09-2015, 10:42 PM   #2
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I think it is a bit low. 600 to 650 would be better but as always, check your engine manual
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Old 03-09-2015, 10:47 PM   #3
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Idle Speed Control - Driver Technique
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Old 03-10-2015, 05:32 PM   #4
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Thanks

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I think it is a bit low. 600 to 650 would be better but as always, check your engine manual
Are yo talking about the CC manual or the Cummins? I'll look through both of them see if I find anything.
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Old 03-10-2015, 05:34 PM   #5
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Very Interesting!

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I didn't you could do all that! Thanks for pointing it out.
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Old 03-10-2015, 08:15 PM   #6
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Most diesels like to idle at 650-700 rpm. In coaches the normal way the idle speed control is set up, if you want to make a change to the standard idle speed, the following procedure is followed on a coach with the cruise control on the smart wheel.
1. Engine running
2. Transmission in neutral
3. Cruise control turned off
4. Press and release the set button. This will raise the idle speed 25 rpm. The resume button will reduce idle speed 25 rpm.
5. This will be saved as the new idle speed.

If you tun the CC on and press the set button the fast idle will be activated to approx 1100 rpm. If you touch a pedal or a CC button it will return to standard idle. This function is temporary and is not saved.

It's possible on your coach the function of the set & resume buttons could be reversed.


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Old 03-10-2015, 09:50 PM   #7
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Originally Posted by Steve Ownby View Post
Most diesels like to idle at 650-700 rpm. In coaches the normal way the idle speed control is set up, if you want to make a change to the standard idle speed, the following procedure is followed on a coach with the cruise control on the smart wheel.
1. Engine running
2. Transmission in neutral
3. Cruise control turned off
4. Press and release the set button. This will raise the idle speed 25 rpm. The resume button will reduce idle speed 25 rpm.
5. This will be saved as the new idle speed.

If you tun the CC on and press the set button the fast idle will be activated to approx 1100 rpm. If you touch a pedal or a CC button it will return to standard idle. This function is temporary and is not saved.

It's possible on your coach the function of the set & resume buttons could be reversed.


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Thanks, Steve! That is very helpful. Actually, I didn't mess with the CC while idling. Now that I know how to set it, I will probably bump up to around 650 rpm, as you suggested. I should also probably use the Silverleaf to see what it is exactly as opposed to the mechanical gauge in the instrument panel.
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Old 03-10-2015, 10:53 PM   #8
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Thanks, Steve! That is very helpful. Actually, I didn't mess with the CC while idling. Now that I know how to set it, I will probably bump up to around 650 rpm, as you suggested. I should also probably use the Silverleaf to see what it is exactly as opposed to the mechanical gauge in the instrument panel.

Trust the Silverleaf.


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