08 3.7 misire p0304 + p2311 - Jeep Garage - Jeep Forum

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  #1  
Old 12-17-2014, 12:54 PM
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08 3.7 misire p0304 + p2311

long time poster/owner here. finally hit a snag with my wk after 83k.

been searching everywhere for an answer to my stupid 3.7 issue. out of no where one day i was sitting in front of my house idling for about 15 mins i got a p0304 misfire. changed plug and ignition coil.

worked ok for about 100 miles and then same thing again. this time i went to dealer and got oem ignition coil and spark plugs. 200 miles later same thing.

ideas? going to do a compression test next day or two.

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  #2  
Old 12-17-2014, 02:45 PM
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Re: 08 3.7 misire p0304 + p2311

just wanted to add when this happened and one thing i noticed was that my rpms dipped down to 400's for a split second and then it starts misfiring. i was using torque pro with my obd2 to keep an eye out on my system.

it also happened the last 2 times in heavy traffic when i had the jeep in drive and foot on the brake.
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  #3  
Old 12-17-2014, 03:11 PM
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Re: 08 3.7 misire p0304 + p2311

Just to be sure, you changed the ignition coil from the #4 cylinder, right?
Did you also check the wiring for chaving or other damage?
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Old 12-19-2014, 10:54 AM
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Re: 08 3.7 misire p0304 + p2311

last night i did an engine compression test on all cylinders (200 for all). i also swapped coil #4 with #1 to see if the code comes up for #1 or #4. i am also going to change my pcv valve and my egr valve and change the thermostat and rad cap.

i have a feeling it might be a sticky valve but i guess lets see
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  #5  
Old 12-19-2014, 11:42 AM
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Re: 08 3.7 misire p0304 + p2311

You could try and run some seafoam through it, in case its a sticking valve.
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Old 12-19-2014, 11:57 AM
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Re: 08 3.7 misire p0304 + p2311

my buddy who came by to help me last night owrks at land rover and he wants to bring it in and run this mist stuff through the TB and try to clean out the head. similar to seafoam.

the use to use seafoam until they started getting CEL from it so they got this new system.

should be safe for my wk right?
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  #7  
Old 12-19-2014, 04:11 PM
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Quote:
Originally Posted by Frango100 View Post
Just to be sure, you changed the ignition coil from the #4 cylinder, right?
Did you also check the wiring for chaving or other damage?
I would vote for the wiring connectors, had the same trouble ....wire shaving du to vibrations. Repaired the problem and gained fuel milage.
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Old 12-22-2014, 02:57 PM
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Re: 08 3.7 misire p0304 + p2311

ahhhhh ok thanks for the help/. ill check that out. the wire is so short to the ignition coil though
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Irfan "Showing off is the fool's idea of glory."
can you beat me in a fight??? http://dreamps.mybrute.com
member of Black, Tri-State, 6 cylinder club 08 Brilliant Black Laredo (JG 3.7L Squad)- k+n 63-1545,magnaflow 10436,mygig(ren), HID's 6k lows, 6k+3k fogs,dual turn leds,led brows,v-led interior leds, cargo led strip, reverse hids, 92 led brake lights, tinted tails,custom powder coated mesh grill, srt sways, 15% tinted windows,illuminated visors,shorty antenna, HH Class III, cargo liner, thule snowboard rack,kayak rack, bike rack

Future mods - color matched side mirrors, black srt reps

My 1-step correction writeup

How To - LED BROW

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