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Old 05-03-2013, 09:13 AM
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2008 Grand Cherokee 4.7 resting idol concern

I have a 2008 grand cherokee with 77000. The idol has started to become a concern. At times the idol drops below 500 and almost seens to stall than kicka up. Otherwise it idols around 600 - 800 rpm. And when im braking and very close to a complete stop I get a hesitational jitter feel. Almost feels like the brakes catch and release slightly but I kniw thats not thw problem. Its just the beat way to explain the experience. Anyone with knowledge or experiencs with this please give me some insight. Thank you
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Old 05-03-2013, 12:39 PM
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Re: 2008 Grand Cherokee 4.7 resting idol concern

The throttle position sensor is VERY common on the 4.7l motor causing many symptoms, one of which is a surging, or searching idle.

IIRC there is also a pcm update for some of the wk's, I think it bumps the idle speed up a bit too. You would ultimately have to go to the dealer to have that checked though.
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Old 05-03-2013, 12:46 PM
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Re: 2008 Grand Cherokee 4.7 resting idol concern

I had the PCM update done on my jeep. when I first bought it I had a random idle stalling problem but it went away when I had the update done. that was over 4 years ago and it has been perfect since then
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Old 05-03-2013, 12:47 PM
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Re: 2008 Grand Cherokee 4.7 resting idol concern

Im at the dealership now. I discussed this with the advisor. I will give an update soon. Thanks again for the insight. Any other ideas. What is the usual cost of these sort of inpsectuins/repairs so I dont get surprised.
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Old 05-03-2013, 02:27 PM
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Re: 2008 Grand Cherokee 4.7 resting idol concern

under warranty they are covered. otherwise some dealers will do from anywhere from free to $200
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