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Stillchi 02-02-2012 03:28 PM

2005 3.7 misfire
hey im goin crazy tryin to figure out whats goin on here but i have a 2005 with 105,000 ive had it since about 65,000.. anyway i did a tune up when i first bout it and knew it was time again .. i started my jeep and knew somerthin was wrong cause it juist strated sputtering , and check engin light came on . i figured i needed a tune up again so i bought new plugs that i did really need . i started it up and its doing the same thing still ! this was on a sunday so i i go to the (zone ) lol again and nask the guys to pull the codes and he says misfire on cyl 3 and its probaly the coil. well i changed the coil and no luck . i even disconnected the battery to reset the computer . im wonderin what else am i noty lookin at ? i have to pull up very slow if i give it to much gas it jerks or jumps and on the highway i can only go 75 mph . pleeeeaaaaaase help !!!!!!! thanx in advance :thumbsup:

Bleeding Blue 02-02-2012 03:39 PM

Re: 2005 3.7 misfire
Have you pulled the plug to make sure the gap is correct?

Stillchi 02-02-2012 03:41 PM

Re: 2005 3.7 misfire
yeah i gapped all of them first

Archer9 02-02-2012 03:53 PM

Re: 2005 3.7 misfire
I hate it when I hear ppl changing parts for no reason. Been there...done that myself. It can get expensive. Sounds to me like it should be a connection somehere...probably to the coil. Check all connections where you worked. And I would re-check the gap as BB said, cuz sometimes strange things happen.

Stillchi 02-02-2012 04:23 PM

Re: 2005 3.7 misfire
yeah i really dont have the money to be just changing parts , do u think it could be the fuel injector ? when i hit the gas it it hesitates like its gonna stop

Jeep Trick 02-02-2012 04:44 PM

Re: 2005 3.7 misfire
When I knocked an injector plug off it gave a different code. I would swap the coil pack to another cyl. just in case it's the coil pack even if unlikely but you might not be getting power to the coil pack. Check the coil electrical connection

Stillchi 02-02-2012 05:59 PM

Re: 2005 3.7 misfire
ill try that in the am thanx

Bleeding Blue 02-02-2012 06:18 PM

Re: 2005 3.7 misfire
Are you using OEM or OEM replacement plugs?

I know when I replaced mine I forgot to hook up one of the coil electrical connectors and it did the exact same thing. Double check all your connections, but im guessing you have done this already.

2005JGC 02-03-2012 02:42 AM

Re: 2005 3.7 misfire
Dead miss I would be looking at something like coil, spark plug, injector or cylinder integrity. (duh kinda right? that should cover it all eh).

When did it start to misfire, just randomly one morning it was running like crap? did you do anything to it prior to the misfire? has it progressively got worse and worse? it is missing all the time right?

IF the answer to my last question is yes, DO NOT DRIVE THE VEHICLE unless you want to pay for catalytic converters. Driving on a misfire will dump raw fuel into the hot catalyst and hello meltdown!

Stillchi 02-03-2012 07:31 AM

Re: 2005 3.7 misfire
i replaced the spark plugs , and thne coil on cylinder 3 since it started it been the same , i try not to drive it unless i really have to tho. and it just started one mornin out the blue . im about to go check my spark plug gap, and swap one of the coil to see if it changes . im thinkin that injector on 3 is the problem cause like i said when i hit the gas it it hesitates

Stillchi 02-03-2012 03:14 PM

Re: 2005 3.7 misfire
still no luck

Stillchi 02-07-2012 07:06 PM

Re: 2005 3.7 misfire
if anyone can please help .....

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