wk 07 hemi overland engine dance! - JeepForum.com
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post #1 of 5 Old 07-10-2020, 06:14 PM Thread Starter
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wk 07 hemi overland engine dance!

hi guys
I just bought a 2007 grand cherokee overland with 5.7 engine.
I have a few problems with the car
- first every startup (cold or hot) the engine will hold the rpm to almost 1300 1400 rpm for almost a minute before it drop slowly to normal.. even after a second of shut off the engine after long drive and start engine again the car hold the rpm the same way as its early morning first cold startup.
witch is very annoying specially when I'm making a move immediately and putting the gear selector to D or R it kicks hard and making the rpm drop from 1400 to 600 at once.
the second problem witch I'm not sure its related i noticed when I reach 40 mph the car start stalling and kicking until its past 60mph.. some times I cant make it go more than 40mph specially when I drive it normally I mean not accelerating so fast...

I tried to scan the car I only have one code witch is p0523 witch is engine oil pressure sensor/switch that might need to be changed but I dont see its related to my problem...

thank you guys and excuse me for my English... best regards

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post #2 of 5 Old 07-11-2020, 07:44 AM Thread Starter
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need help
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post #3 of 5 Old 07-12-2020, 03:51 PM
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Just a guess but I'd have a look at your throttle body, they have a habit of getting very gummed up and it might be holding itself a bit too far open after it has performed its self check at start up. Dont go spraying the whole thing with a dose of carby cleaner, you need to remove it and give it a gentle clean, but I'd start by removing the air intake hose and have a look there. Would have thought a few more codes would be set but not sure all the trigger points for it.

2005 WK Limited Hemi, 2" OME lift, header back exhaust, 245/75/R17 MT, Superchips tuned, Roof rack
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post #4 of 5 Old 07-12-2020, 06:38 PM
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if you want to clean the throttle body with out removing it , use long q tips soaked in carb cleaner or alcohol. be sure that you clean well behind the throttle body.
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post #5 of 5 Old 07-17-2020, 03:06 PM
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First thing I'd check would be the spark plugs. It sounds to me like your plugs might be getting bad, based on the 40 - 60 MPH issues you're stating occur ("stalling and kicking"). The only time I ever experienced what you're describing is when a spark plug lost the ground electrode.

Did you buy the Jeep from a dealership or a business? If so, would they help?

How many miles do you have on the Jeep?

Do you have service records? If not - http://www.wkjeeps.com/wk_maintenance.htm

2007 Jeep Grand Cherokee Overland
5.7 Hemi - Airaid CAI - Magnaflow
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