1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Rpm question

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  #1  
Old 08-16-2011, 07:48 AM
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My truck idles (in park) at about 750 rpm with the ac off around 700 with it on.
When i put the truck in drive though it drops down to about 550 rpm.. Is that normal for these trucks? Just seems kinda low for me..
 
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Old 08-16-2011, 10:03 AM
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just a tick low. i dont like them real fast either.
 
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Old 08-16-2011, 10:22 AM
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So its nothing to worry about?
 
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Old 08-18-2011, 12:39 PM
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if it doesn't kill the motor your fine. Thats just normal drop because you added additional draw on the motor by way of the tranny.
 
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