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-   -   Idle RPM's (https://www.dieselbombers.com/12-valve-2nd-gen-dodge-cummins-94-98/29617-idle-rpms.html)

JakeB 07-21-2009 09:27 PM

Idle RPM's
 
1 Attachment(s)
Hey guys, I noticed today that my truck seems to be idling a little lower than it should. It was 105 today in Phoenix, and I take that into consideration but it would seem in drive with A/C on full blast it's idling at about 5-600 RPM and about 700-750 in park. I think it should be running at least 750-850 in drive with the A/C on right? Is this a sign of problems to come or do I need to just adjust my idle screw?

Here's a pic of the idle RPM in drive with A/C full blast:

Attachment 51965

rkadcock 07-21-2009 10:18 PM

In gear with the AC on it should idle at 750 rpm. Here in Albuquerque during the summer my truck does the same, but it only goes to about 650-700 range so I don't its a problem, but I could be completely wrong. But if its hitting 500 with the AC on in gear I would say you just need to turn your idle up abit.

89silverbullet 07-22-2009 12:00 AM

i have mine set just above the third line with the ac on

JakeB 07-22-2009 12:02 AM

Ok, so I'm not too far off then?

89silverbullet 07-22-2009 01:10 AM

i turned mine up to where i thought the motor ran the best. have you noticed any hard starting?

94cummins12v 07-22-2009 02:29 AM

if thats what your is in gear with the A/C on i would turn it up. mine with the a/c on is a tad below the 1k mark but i like mine high idle

JakeB 07-24-2009 04:45 PM

Ya, runs way better now. That screw is a pain in the butt to find. :argh: I'm idling right above the third line now in D with the A/C on, runs wayyy better sounds like it should. Thanks.

:yeah:

Threesixty 07-24-2009 06:07 PM

That picture could be a picture of my own truck, 'cause thats about where mine idles at all the time. And I never turn off the A/C.... (that's just crazy talk....). I'm at sea level, if that makes a difference....

But then again, Drive isn't an option on mine. So, can't comment on that.

97dirtydozen 08-05-2009 01:42 AM

Does anyone have a trick to adjust the base idle screw..im having the same problem with mine..and i found the screw, just seems a little hard to get in there to adjust it..:humm:

JakeB 08-05-2009 01:50 AM

I used a single 10mm wrench and I'm not the world's best mechanic, just give it a try. It's not hard at all. Just play with it till you get it how you want.


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