Jeep - Grandcherokee :: Sputters And Misfires After Idling For Long Period Of Time
Dec 22, 2015
I have a 2002 Grand Cherokee with 225,000 miles (hooyah!) on an I-6 . After driving for long distances (at least an hour on the road) then idling for extended periods of time, it seems it starts misfiring. RPMs drop to about 500 and will not rev past 1200 without dying completely.
This has happened a few times in the following scenario:We have 3 kids and often visit family out of state. We'll drive for several hours before pulling off at a rest area. To minimize the amount of time spent off the road and to save the hassle of unloading/loading all the kids, we'll leave the car running (to keep heat/cool air in) and either myself or my wife will run in to use the restroom and get snacks. The vehicle may idle for 10 minutes before the issue presents itself. It seems that if we turn the vehicle off and rest for a few (3-5) minutes, the problem will resolve itself and we can be on our way with no more issues.
Check Engine light is on but only throws a code for an EVAP leak. I don't know a whole lot about cars. I thought it could be time to replace spark plugs but this issue doesn't happen often and it seems only in these specific circumstances.
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He's determined he thinks it has a weak hpop. Not sure I'm sold on this. Fast forward six months and now I'm pretty sure I'm going to buy it. Drove it yesterday and same thing, first 4 or 5 miles kinda studders or misses but after that runs smooth and has no issue. No longer blows white smoke at all or anything. Obviously the fuel is old as hell, other than that what is everyone's thoughts?
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It's probably a normal noise produced by this style transmission, just looking to verify if this is true so I can stop worrying about it.
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MODS:
NO Limit EGR Delete
Flo-Pro 5" Straight
S&B Intake
SCT Livewire w/ custom tunes
Also, I had a lot of problems with my live wire software. I have to send it back to SCT to get warranty problems fixed which I'll be sending out Monday. They think my tuner is stuck in demo mode for some off reason.
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