Trouble finding the cause of a misfire. - JeepForum.com

 
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post #1 of 4 Old 08-10-2013, 07:46 PM Thread Starter
lipperboy1023
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2002 WJ 
 
Join Date: Jul 2013
Location: warrenton
Posts: 2
Wj Trouble finding the cause of a misfire.

Ok so here is what im dealing with. i have an 02 jeep grand cherokee 4x4 4.0L that all of a sudden one day started to have a misfire of some sort. At the beginning of the day it ran find i had went to the gas station to get gas filled it up with 91 octane drove on into town and when into the store to get a few things. when i when to start up again the misfire started. i took it easy and got it back home and just thought that maybe i fowled a plug but when i replaced them it changed nothing. from there i tried cleaning out my injectors, still same ol thing. then i started going through a list in my head of everything that i know of that causes a misfire. all that i have replaced that i can think of is my spark plugs, injectors, coil pack, cam sensor, crank position sensor, and then i went through the whole jeep and made sure i had no open grounds. after doing all this it still have the same misfire. whats odd is that i can start it up and for the first couple seconds it is completely find then it will start to misfire, really its more of a shutter then a misfire. could this by any chance possibly have anything to do with my fuel system...fuel filter, fuel pressure, or fuel pump. please can anyone help!?!?

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post #2 of 4 Old 08-10-2013, 08:04 PM
beachguard
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2004 WJ 
 
Join Date: Jul 2013
Location: Sumter
Posts: 43
I have a simalar problem. SOMETIMES when I start my truck it will idle weird almost like its going to stall. I can put the peddal on the floor and the rpm wont even move. If I let it sit for a few seconds and put it in drive, it will move but still sounds like its going to die. After I drive it for a while it will go away. Not really sure what it could be. suggestions?
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post #3 of 4 Old 08-10-2013, 10:11 PM
rdkendrick
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Join Date: Jan 2013
Location: Cincinnati
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Quote:
Originally Posted by lipperboy1023 View Post
Ok so here is what im dealing with. i have an 02 jeep grand cherokee 4x4 4.0L that all of a sudden one day started to have a misfire of some sort. At the beginning of the day it ran find i had went to the gas station to get gas filled it up with 91 octane drove on into town and when into the store to get a few things. when i when to start up again the misfire started. i took it easy and got it back home and just thought that maybe i fowled a plug but when i replaced them it changed nothing. from there i tried cleaning out my injectors, still same ol thing. then i started going through a list in my head of everything that i know of that causes a misfire. all that i have replaced that i can think of is my spark plugs, injectors, coil pack, cam sensor, crank position sensor, and then i went through the whole jeep and made sure i had no open grounds. after doing all this it still have the same misfire. whats odd is that i can start it up and for the first couple seconds it is completely find then it will start to misfire, really its more of a shutter then a misfire. could this by any chance possibly have anything to do with my fuel system...fuel filter, fuel pressure, or fuel pump. please can anyone help!?!?
Did you try changing one of the good coil packs to the one that mis-fires? And putting the coil pack from the mis-fire location where you took it off the good plug? Might be failing coil pack. Also, any way to clean the injector at the misfire location?

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post #4 of 4 Old 08-28-2013, 04:06 PM Thread Starter
lipperboy1023
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2002 WJ 
 
Join Date: Jul 2013
Location: warrenton
Posts: 2
well now its not really a misfire. i can start it up and it is fine. as soon as i get it up to about 1500-2000rpms in park it wants to start shuttering. almost sounds like a bad lifter but i kno it isnt that because i have just replaced all of them. if i put it in drive and go to pull off it goes just fine but right before it shifts into the next gear once again it want to shuttering but as soon as it shifts its fine. im not sure what is causing this but i do know it is something to do with the engine and if not the engine its self it is electrical im just not sure what.
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