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  #1  
Old 11-19-2014, 06:18 PM
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jeep surge idle

Seems like my 09 grand cherokee seems to surge in temperatures above 40 at idle. What i mean is when idling at its normal 550-600 range (at least thats where mine is) it will sometimes drop down from that point to like 450 rpm but bring itself right back up if the temperature is above 40 degrees. If its below 40, which it currently is 30 degrees right now in new york, it will idle fine and stay at that 550-600rpm range with no trouble. Any ideas? replaced a lot of things over the past month cause i had some idle issues including: camshaft, cleaned throttle body, spark plugs, checked transmission fluid level, map sensor, lcv valve, erg valve, and ecu reflashed at dealer last week. Dealer said its just the way the engine is and will do this from time to time. Honestly as long as it doesn't stall on me, which it hasn't, it doesn't really bother me. One time it dropped down to about 300 rpm and restarted itself but that was before the reflash and a few things getting replaced. Gonna replace the crankshaft sensor tomorrow but other than that, can't think of what else could cause this. anyone have any ideas or currently have this problem? its the 3.7 engine btw.

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Old 11-19-2014, 06:52 PM
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Hi Jeff
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Old 11-19-2014, 06:54 PM
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Re: jeep surge idle

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Hi Jeff
Hey friend
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Old 11-19-2014, 08:03 PM
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Got the same deal going on. I wonder what's up with it? Car always runs good
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Old 11-19-2014, 10:35 PM
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Re: jeep surge idle

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Got the same deal going on. I wonder what's up with it? Car always runs good
idk man unless someone comments this with a solution to this problem (if you would even call it a problem at this point), il just live with it. Tried everything and does the same thing. Not gonna throw parts at it if no codes come up. Already put $350 towards it with no results. The parts i might have replaced might still have been good but oh well, got future preventative mainatience now

As long as the jeep doesn't stall, i guess its not worth going crazy about
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Old 11-20-2014, 08:51 AM
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The way I see it, gotta be fuel air related. Because why does it run fine under 40. I mean I mentioned that before you even noticed it. I wonder if fuel injectors or something. Either way we know the car is capable of running at normal idle.
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Old 11-20-2014, 12:00 PM
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Re: jeep surge idle

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Originally Posted by Boomer914 View Post
The way I see it, gotta be fuel air related. Because why does it run fine under 40. I mean I mentioned that before you even noticed it. I wonder if fuel injectors or something. Either way we know the car is capable of running at normal idle.
Could be but I have added sea foam and other gas cleaning products to the gas tank and it doesn't seem like it improved. Well after replacing crank today, haven't seen it surge. It's currently around 45 right now in ny. Not giving my hopes up though
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Old 11-20-2014, 12:32 PM
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I ment fuel air like how the computer calculates what the mix should be. And a lot of that is air temp readings too.
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Old 11-20-2014, 12:34 PM
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Re: jeep surge idle

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I ment fuel air like how the computer calculates what the mix should be. And a lot of that is air temp readings too.
So what do you think should be replaced then in that scenario?
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Old 11-20-2014, 12:44 PM
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Have no idea the whole computer would need new algorithms
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Old 11-20-2014, 01:14 PM
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Re: jeep surge idle

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Have no idea the whole computer would need new algorithms
Jeez...:sounds like too much now for this issue. A new ecu on the other hand would be too much for me. Not worth putting anymore money into it if it doesn't stall.
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Old 11-20-2014, 02:23 PM
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Re: jeep surge idle

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Originally Posted by Jeff1119 View Post
So what do you think should be replaced then in that scenario?
IAT (Intake Air Temperature) sensor. It's located under the air box plenum (boxy part of the air-cleaner assembly that is right in front of your throttle body)

Here's the part: More Information for STANDARD MOTOR PRODUCTS AX69

Could also be your Idle Air Control Valve: More Information for STANDARD MOTOR PRODUCTS AC482

But, the temperature sensor is cheaper, so I'd start with that. Plus, I think it's the only sensor that could screw with the computer's idle controls if it was relaying the wrong temps.
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