Can you slow down an idling automatic or make the brakes more sensitive?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Davis42200, Feb 5, 2025.

Feb 5, 2025 #1

Davis42200 Bobtail Member

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Dec 7, 2020

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I'm driving this 2013 Peterbilt with a 6 speed Allison automatic. It idles at 750 rpm and will go 5-6 mph without pressing the throttle. Holding it back in stop and go traffic is starting to give me knee pain. Is there a fix for this or is it just how these automatics are? Can I drop the idle down? Engine is paccar PX8 (8.3).

Davis42200, Feb 5, 2025

Davis42200, Feb 5, 2025

#1
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Feb 6, 2025 #2

Heavyd Road Train Member

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Feb 4, 2009

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Not sure about Paccar engines, but Cummins do have Idle adjustment by simply pushing the cruise buttons to raise or low idle speed. Worth a try on yours.

Heavyd, Feb 6, 2025

Heavyd, Feb 6, 2025

#2
Feb 6, 2025 #3

Goodysnap Road Train Member

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Jul 12, 2017

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PX8 is an ISC So yes you can change base engine idle with Insite.

Goodysnap, Feb 6, 2025

Goodysnap, Feb 6, 2025

#3

Heavyd and Oxbow Thank this.