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post #1 of 19 (permalink) Old 11-27-2007, 10:09 AM Thread Starter
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engine idle?

Hello All. I posted on this back in June when I first bought the vehicle. ('07 2wd - 4.7 flex fuel engine - regular gas). I noticed that during the 500 mile break-in, on occassion, engine idling seemed to drop to 500 rpm's and idled a little rough.
At first oil change (3000 miles), I mentioned this to the dealer about the occassional rough idle and their response was that it was within the engine's "normal operation".
Question being, seeing that the dealer seems to think that this idle is within the computers tolerances and unadjustable, would there be an independant shop capable of bumping up the idle by maybe 200 rpm's just to smooth it out? (Currently 50% of the time with variable rough idle). Thanks guys - Brad
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post #2 of 19 (permalink) Old 11-27-2007, 10:13 AM
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No an independent shop can't adjust your idle.

I don't understand the problem. You want it to idle faster, but why? Just because you don't think it sounds like you want it to?
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post #3 of 19 (permalink) Old 11-27-2007, 11:04 AM
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Not sure on the Commander... on the Cherokee, there is an idle position set screw on the throttle body which will allow you to adjust the idle speed.

I am not sure that you need to adjust it though. Adjusting it too high can cause other issues.
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post #4 of 19 (permalink) Old 11-27-2007, 03:45 PM Thread Starter
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It's not about the sound but about the fluxuation between 500 rpm's and 600/650's, what I would consider a normal smooth idle speed. At about 650 rpm's the truck seems smooth and happy. The issue is that it drops to 500 and has a rough noticable idle.
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post #5 of 19 (permalink) Old 11-27-2007, 04:41 PM
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I guess my real question is. How does that negatively impact performance? Meaning, if it isn't broken, there isn't anything to fix.
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post #6 of 19 (permalink) Old 11-27-2007, 06:16 PM
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I'm guessing he is just getting a rough idle??? I'll pay attention to mine, although I have the 5.7 I have noticed the tach drop down to 500 once in a while. Do you use regular unleaded fuel?? I don't know much about the flex fuel stuff.
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post #7 of 19 (permalink) Old 11-27-2007, 08:48 PM Thread Starter
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Again, it's not about performance and I realize that it is not broken. The engine idles rough 50% of the time, with a feeling of a slight miss or as in the case of my old '93 grand Cherokee, when the engine mounts were worn out.
I noticed in a prior post, in an industry report about the newly developed 4.7 V8 due out next year, that amongst other things, the newer engine would have a smoother idle.
I'm not asking to fix a problem - more to the point or the possibility of slightly raising the idle speed to where it is noticeably smoother.
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post #8 of 19 (permalink) Old 11-27-2007, 08:57 PM
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Quote:
Originally Posted by jbmphoto
Again, it's not about performance and I realize that it is not broken. The engine idles rough 50% of the time, with a feeling of a slight miss or as in the case of my old '93 grand Cherokee, when the engine mounts were worn out.
I noticed in a prior post, in an industry report about the newly developed 4.7 V8 due out next year, that amongst other things, the newer engine would have a smoother idle.
I'm not asking to fix a problem - more to the point or the possibility of slightly raising the idle speed to where it is noticeably smoother.
If you really have concerns that it is not performing right, take it the dealer to check it out (not just push you off, but actually check it out). However, note that the CAN system will most likely report back any issues like misfires, low idles speeds, etc. via a MIL illumination.

By the way, the revised 4.7L V8 is out now in the 2008 Commanders.
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post #9 of 19 (permalink) Old 12-06-2007, 04:44 PM
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Quote:
Originally Posted by RedCommander
I guess my real question is. How does that negatively impact performance? Meaning, if it isn't broken, there isn't anything to fix.
I have the same issue from time to time ... it basically feels like the Jeep is going to stall or it "sputters" when you give it gas. Dealership here (Austin, TX) said it was normal too. I dont think it's normal, but it hasnt failed me yet so I've just learned to live with it.
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post #10 of 19 (permalink) Old 12-15-2007, 09:40 AM
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well for our commander its not safe ..during its sputtering events it is stalling in the intersections.is there a thread concerning this?what is the dealer remedy?
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