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  #1  
Old 02-18-2015, 07:04 PM
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ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

Well after FINALLY solving my idle surge in the rain after 5 months i have yet another idle issue yet not as bad....Let me explain.... on my 2009 jeep grand cherokee 3.7 is warmed up, if i have the heat or just regular cold air on, thats fine, the idle is normal at 600 while in park. If however, i press this defrost button in the picture below, and I'm in any setting whether it be air going to your feet or air coming through the top vents, or just towards the windows, about 2 minutes after pressing that button the idle starts going all the way up to 800 rpm and stays there until i turn the jeep off and back on. It will not matter if i turn the heat off or depress that defrost button, the idle stays at 800 rpm until i restart the jeep. Now this high idle issue, which of course I'm having a high issue now how funny, only happens when i press that defrost button, having just the heat on without the button pressed does not raise the idle, you could say i have control over this issue as compared to my previous surge issue which i had no control over unless it was no longer raining. So my question is, what the heck in the world is this problem? this just started tonight. I mean a high idle like that i much prefer over a low but still, just because i pressed that defrost button it goes all the way to 800 rpm? thats a little too high. Thoughts anyone? This jeep is possessed with idle issues...
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  #2  
Old 02-20-2015, 10:45 AM
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Re: ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

Probably idle raise related to the AC compressor coming on. When in defrost, this will come on to dry the air.

A little bit of a bump in idle is expected. Not sure if 800 is more than one would expect for that motor. Could be normal.
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Old 02-20-2015, 03:11 PM
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Re: ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

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Originally Posted by dr.lee.baugh View Post
Probably idle raise related to the AC compressor coming on. When in defrost, this will come on to dry the air.

A little bit of a bump in idle is expected. Not sure if 800 is more than one would expect for that motor. Could be normal.
not normal at all, when the ac comp kicks in theres actually a slight dip in rpms before it restabilizes.

Jeff, are you getting any warning lights on the dash?
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Old 02-20-2015, 04:40 PM
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Re: ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

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Originally Posted by Strongjeff View Post
not normal at all, when the ac comp kicks in theres actually a slight dip in rpms before it restabilizes.

Jeff, are you getting any warning lights on the dash?
Nope I didnt. Jeep always says "system ok" anytime these strange idle issues happen. Strangly enough though, t hasen't happened since. I tried playing around with it before.
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Old 02-21-2015, 07:42 AM
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Re: ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

Next time it happens again have a look under the hood if the AC compressor clutch is engaged. Because as soon as you switch the compressor on ( no matter in Defrost or just pushing the AC button) the PCM will add a bit more fuel to compensate for the expected drag which the compressor will cause. Due to this extra fuel, there will be almost no change in rpm. Would for whatever reason the compressor clutch not engage, you could expect a bit higher idle rpm.
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Old 02-21-2015, 12:09 PM
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Re: ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

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Originally Posted by Frango100 View Post
Next time it happens again have a look under the hood if the AC compressor clutch is engaged. Because as soon as you switch the compressor on ( no matter in Defrost or just pushing the AC button) the PCM will add a bit more fuel to compensate for the expected drag which the compressor will cause. Due to this extra fuel, there will be almost no change in rpm. Would for whatever reason the compressor clutch not engage, you could expect a bit higher idle rpm.
will do. il keep playing around with it and see what happens. Appreciate it and will keep this thread updated
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Old 02-25-2015, 02:18 PM
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Re: ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

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Originally Posted by Strongjeff View Post
not normal at all, when the ac comp kicks in theres actually a slight dip in rpms before it restabilizes.

Jeff, are you getting any warning lights on the dash?
Something is wrong with my Jeep then. My idle always is a little higher (50-100rpm) with the AC compressor on when compared to off. It's not a surge and return or a dip and return, just an overall increase. Been like that since day 1...175,000 miles later and it has never posed a problem.
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Old 02-25-2015, 04:54 PM
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Re: ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

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Originally Posted by dr.lee.baugh View Post
Something is wrong with my Jeep then. My idle always is a little higher (50-100rpm) with the AC compressor on when compared to off. It's not a surge and return or a dip and return, just an overall increase. Been like that since day 1...175,000 miles later and it has never posed a problem.
Normal happens to mine too
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Old 03-01-2015, 03:53 PM
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Re: ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

Update: hit the defrost button before to melt the snow while driving and when I put it in park, noticed I was back idling at 800rpm again. Shut it off and back on and I was back to normal idle. What's with this defrost button causing this?!
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Old 03-03-2015, 10:44 AM
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Re: ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

It certainly sounds like there is something weird going on...

Do you have access to a scan tool that can stream live data from the sensors? How repeatable is it now that you know turning on the rear defrost can cause the increase? I don't see a 1-1 relationship between the rear defrost and the idle speed - it will certainly increase the load on the battery, but you may have some other strange electrical gremlins lurking about. It could also be just a coincidence, and why I am curious as to the repeatability.
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Old 03-03-2015, 04:20 PM
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Re: ANOTHER IDLE ISSUE?! You have GOT to be kidding me....

Quote:
Originally Posted by dr.lee.baugh View Post
It certainly sounds like there is something weird going on...

Do you have access to a scan tool that can stream live data from the sensors? How repeatable is it now that you know turning on the rear defrost can cause the increase? I don't see a 1-1 relationship between the rear defrost and the idle speed - it will certainly increase the load on the battery, but you may have some other strange electrical gremlins lurking about. It could also be just a coincidence, and why I am curious as to the repeatability.
it repeats whenever i turn it on. I might have to wait a minute or two after pushing it for it to start. I can be in any mode to and it will do it just as long as i push the defrost button and wait about a minute or two. I do have a scan tool that reads sensor data. But from from doing the key dance and scanning the system myself, everything checks out ok
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Old 03-03-2015, 04:31 PM
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Originally Posted by Jeff1119 View Post

it repeats whenever i turn it on. I might have to wait a minute or two after pushing it for it to start. I can be in any mode to and it will do it just as long as i push the defrost button and wait about a minute or two. I do have a scan tool that reads sensor data. But from from doing the key dance and scanning the system myself, everything checks out ok
Well out of my own curiosity I tried to replicate your issue with no avail. I can hear a slight change in exhaust tone when I turn it on but I get no jump in rpms. Just a slight dip from 600 down to 575 before it stabilizes at 600. But I can see the load on the system via ecm voltage thru my UG. I get a slight dip in voltage bit it's not much.
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