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  #1  
Old 01-14-2011, 02:44 AM
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Smile RPM at Idle

I live in Houston, TX, the air conditioning capital of the world. So normally the a/c is on in my 2007 Ram 1500 Hemi 5.7L. Well it's been cool here lately because of that Global Warming, you know. I had to learn where the a/c button was. Anyway, when the A/C is on, my truck idles smooth as silk and RPMs, I believe, are around 600. But with the A/C off and the trans in drive the RPMs drop to about 500. At this RPM my truck rocks like it has a bit larger cam. I'm just wondering what the idle should be with A/C off? Is this normal?

The truck has about 98k miles and the spark plugs have never been change. I know, I'm going to tackle that feat this weekend if Global Warming lets me, LOL. I plan to go back with the factory same Champion plugs as suggested to me before by great Z members. This may take care of the ruff idle if it is a problem. I don't remember ever having ruff idle with A/C off before and I am wondering if this is something new. I am greatful for any comments.
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  #2  
Old 01-14-2011, 02:49 AM
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My truck has a little bit of a rough idle either way w/ new plugs,recently seafoamed, new air filter TB cleaning but RPMs sit correctly maybe shes just a rought idler my Dakota idled rough from pretty much 0 miles til I sold it at 160k but spark plugs are a good start and should prob be changed anyway at that mileage lol good luck
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Old 01-14-2011, 10:20 PM
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Thanks Moparmaniac, I guess a little rockin' and rollin' is normal. I appriciate your feedback. By the way what did you mean when you wrote, "recently seafoamed?"
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Old 01-14-2011, 10:26 PM
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I was gonna recommend a good throttle body cleaning .
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Old 01-14-2011, 11:10 PM
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Thanks Tom, will do.
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Old 01-29-2011, 01:38 AM
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Default RPM at Idle Corrected

Finally changed the spark plugs after 98K miles. Decided not to tackle the job myself . I had the service company install Champion 570 factory plug equivalents. The good news is my idle is very smooth now, as it was when the A/C was on. The idle has jump from 500 to 600. I can barely tell the engine is running. Check out the picks I attached of the old spark plugs. Other than some gap differences, a little metal erosion and a little carbon, I thoughtthe plugs looked pretty good for 98K miles. I don't recommend that you wait as long as I did to change your plugs. Many have told me of the dangers of leaving plugs in to long in aluminum heads. And many have told me about Ford Mustang plug problems with leaving them in for 100K and the aluminum threads come out with the plugs. I will say though, I was very lucky as these threads look pretty good.

On a side story, I called around a got 3 prices to change the plugs because I couldn't bring myself to do the job. The lowest price I got was $125 from Pep Boys so I went there. What a joke, after they started the job and I've walked over to a near by Home Depot to do some window shopping, they call me and say they can't complete the work. They under estimated the job and the new price is now $330. The mechanic said my truck was different than other Dodge trucks with a Hemi and he was going to have to remove the brake booster, what an idiot. I told him that he must have just started in this line of work and put my truck back together. I took my truck to Firestone Service Center which was now the lowest price. They completed the job in about 2 hours for $230 plus tax. This is eating into my mod budget. But I'm glad this is done and over with until the next 30K.
Attached Images
File Type: jpg Hemi Plugs.jpg (132.8 KB, 8 views)
File Type: jpg Hemi Plugs 2.jpg (131.5 KB, 11 views)
File Type: jpg close up.jpg (105.4 KB, 6 views)

Last edited by Basic Corpse; 01-29-2011 at 01:41 AM.
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  #7  
Old 01-29-2011, 01:44 AM
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One way to keep the idle smooth is to make sure your throttle body gets a good cleaning now and then.
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Old 01-29-2011, 02:43 AM
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WOW, the 2 plugs in that center pix were just about shot, electrodes are rounded & worn out, gap was off quite a bit
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Old 02-04-2011, 10:11 AM
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Quote:
Originally Posted by GTyankee View Post
WOW, the 2 plugs in that center pix were just about shot, electrodes are rounded & worn out, gap was off quite a bit
I was going to say the same thing-- those were ready for replacement many moons ago! Glad you got them done!
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