Idle RPM'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

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.

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

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

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

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

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:

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.

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:

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.

Cool thanks

Ok guys I adjusted my idel it sounds better and runs better but my concern is the idel now In park it idels around 900 but in drive w/ a/c on its around 750-800 should I even concerned at all?? :s:

I live at 8,000 ft and until i turned up my idle my truck would die if i had the AC on and came up to a red light and had to stop.... now in gear at a red light with the AC full blast i am sitting at 500rpm's.

1997 Cummins
 

i live in Texas and my truck idles fine until the A/C is turned on and the truck is in gear. it will idle down so low that the engine will die at a complete stop. any suggestions?

I would try adjusting the idel. cuz before i adjusted mine if I went to take off and had to atop the truck would stumble or die. But once I adjusted the idel it stopped and runs better more than likely ur out of adjustment try it and see what happens (over the years it rattles loose)