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Old 03-19-2012, 05:50 PM
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Jeep Idling Concern

Any and all suggestions are appreciated. I have a 2009 Jeep Grand Cherokee Overland Edition. I drive it daily about an hour to Baltimore. When it rains and I drive for about an hour and have to stop in traffic/stop sign/traffic light, the RPM drops below .5 and back up again. You can watch the RPM go up and down. In fact, the Jeep will stall. If had to shop and no codes appear. Once the engine is dry or conditions are dry, the engine runs perfectly. Please help
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Old 03-19-2012, 09:14 PM
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Re: Jeep Idling Concern

This only happens when it is raining and after driving for an hour.

Does this happen every time with the above conditions?

Have you cleaned the throttle body?

Is the battery the original one?

I look into the wiring connections for condensation/corrosion/poor connection.
Bad/loose O2 sensors
EGR valve
PCV valve
Plugs properly gapped
Has all maintenance been done?

Just some quick/common ideas off the top of my head.
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Old 03-20-2012, 06:02 AM
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Re: Jeep Idling Concern

Yes, since September of this year, it happens. In fact, the engine/Jeep needs to get pretty wet in order for it to happen. If I drive to the local store in the rain and back home, it will not happen. So, typically after 30-45 minutes of constant driving in wet conditions.

To date, I have conducted all the recommended service requests, oil changes, etc. Jeep has installed the latest updates to the internal computer, removed a small amount of carbon build-up, and replaced cyclinder 5 head when we discovered that the spark plugs were burning. At this point, I pray for sunny days only since I cannot drive it safetly in the rain. Thanks for your suggestions. If this narrows down any additional thoughts, thanks!!
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