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Old 09-16-2012, 11:11 AM   #1
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p0302 code and weird smell

Popped a p0302 code lastnight on the interstate jeep shut down and died, it started back up and has a really bad misfire it now has a bad smell and won't go over 50mph, today I changed the coil pack and checked the plugs they look brand new put in at 86k and now at 106k on jeep... 2005 LJ 4.0L

Any help on this would be awesome it is my dd and the wife is gripping....

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Old 09-16-2012, 11:24 AM   #2
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A p0302 is a misfire on cylinder 2, as for the weird smell, can you describe the sme?

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Old 09-16-2012, 11:34 AM   #3
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I knew what the code is for just trying to figure out what is up.... It smells like hot motor but it is not over heating and all fluids and oils look good.... Like I said already changed coils and checked plugs...
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Old 09-16-2012, 11:54 AM   #4
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Has anyone else had this problem???
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Old 09-16-2012, 02:00 PM   #5
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Cleared the check engine light and now it is back on with p0300,301,302 codes all misfires so it looks like time for plugs I guess....
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Old 09-16-2012, 02:06 PM   #6
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Replace the plugs and wires first, if it doesn't go away, then we might have a deeper problem, I'll dig around
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Old 09-16-2012, 02:13 PM   #7
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You replaced bad coils??? Did you recently put Spark Plugs in??? I would check all the wire for burning, check all connections for looseness.
My other question, what did you do prior to the problems. Anything. Pop the hood, anything.
Thats a serious malfunction you have. Plugs just dont fail like this. And wires dont either. You really need to get out the inspection lite and do some serious looking.
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Old 09-16-2012, 02:19 PM   #8
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Quote:
Originally Posted by Turbostixxx
Replace the plugs and wires first, if it doesn't go away, then we might have a deeper problem, I'll dig around

Already replaced the coils this morning and it is still popping codes after I clear them? plugs looked good they do have 20k on them, so going to replace tomkrrow with NGK 3459 V Power copper plugs...
Any other ideas??????
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Old 09-16-2012, 04:00 PM   #9
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First, I doubt it's the spark plugs. You already checked them and said they looked brand-new which is good enough for me.

And for newer Jeeps like yours, I wouldn't run a straight conventional copper spark plug like the 3459's from NGK. 2000 and newer 4.0L engines have distributorless ignitions that fire the spark plugs twice as often as in conventional engines so conventional copper plugs only last half as long as they would in other types of engines. I'd go for double-tipped platinums like Autolite's APP985 or Champion's 7034 that will perform well for 100k miles, or Autolite's iridium tipped XP985 that will last pretty close to 200K miles.

If that bad odor smells like gasoline, you might have a bad 02 sensor which is causing the engine to run way too rich which can cause your symptoms.

Do you have a Check Engine light? Have you checked for any diagnostic trouble codes by turning the ignition switch on-off-on three times within five seconds and leaving it on to start the diagnostics? If not, do so. Be sure to give it time after leaving the ignition on after the last cycle, the diagnostic routine takes 4-5 seconds to run and display any codes it finds in the odometer. It will at least say Done in the odometer if you did it right, even if it doesn't find trouble codes.
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Old 09-16-2012, 04:29 PM   #10
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Jerry,

I checked the codes and got p0300,301 and 302 those are for random misfire and cylinders 1 and 2.... No codes for o2 sensor I am willing to try anything going to seafoam tomorrow and clean injection system to..
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Old 09-16-2012, 04:49 PM   #11
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Also I just switched the copper plugs out for the xp985 plugs I want to switch them out trying for better mileage as well.
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Old 09-16-2012, 07:04 PM   #12
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Wrong plugs will cause misfire. Especially those fancy ones. And could you be alittle more specific on the smell. Did it smell like a fart, gas, Marijuana or maybe a cold beer? You say it smelled like a hot engine? And the engine RPM when you are trying to get over 50mph. And its spitting and sputtering when youre at 50mph? Or only when you go up a small hill. Putting the wrong plugs will damage crankshaft, Bearings, Piston and your timing.
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Old 09-16-2012, 07:53 PM   #13
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Quote:
Originally Posted by johnpmcelroy
Wrong plugs will cause misfire. Especially those fancy ones. And could you be alittle more specific on the smell. Did it smell like a fart, gas, Marijuana or maybe a cold beer? You say it smelled like a hot engine? And the engine RPM when you are trying to get over 50mph. And its spitting and sputtering when youre at 50mph? Or only when you go up a small hill. Putting the wrong plugs will damage crankshaft, Bearings, Piston and your timing.
Smells like oil burning but no leak, and about 2,300rpms when it is at 50mph no hill and it sputters bad, already replaced coil pack and trying to go down the list of ideas that could cause this problem..... And what plugs do you suggest????
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Old 09-16-2012, 09:50 PM   #14
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Have you done a real good examination of your engine. What did you do to your Jeep before you had this problem. 4x4 somewhere, What? Excessive RPM? If I had this problem, I would have had it towed to the Dealer. Do you have black smoke coming out of the exhaust. Or a thicker smoke than usual. Kinda like a stunt plane at an airshow.
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Old 09-16-2012, 09:56 PM   #15
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And as far as plugs, I would stick with the plugs that were designed with this engine, as stated in the owners manual. Not what Schucks or Chief gives you. When it comes to parts for my vehicles, it is dealership only.
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Old 09-16-2012, 09:57 PM   #16
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Nothing it was running great then it kinda jumped and sputtered when on the interstate and started running really bad... I have looked everything over really good and still can't figure it out no smoke or anything like that to....

I am a ase mechanic no way in Hell it is going to the dealer LOL!!!!! Only thing I won't do is auto trannys....

I do appreciate the helpful ideas I am looking at everything have run it with computer plugged up at work and the bank one sensor one was running a little high on volts compared to bank two sensor one so might be something there....
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Old 09-16-2012, 10:04 PM   #17
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Could it be clogged cat? Had that problem on my Honda, exact same symptoms, shops not dealer could figure it out until 2 months later it popped a code, remember though, takes 15k misfires before a misfire code is thrown, or it is supposed to
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Old 09-16-2012, 10:05 PM   #18
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Shops NOR dealer could figure it out * sorry on my phone
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Old 09-16-2012, 10:08 PM   #19
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Quote:
Originally Posted by Turbostixxx
Could it be clogged cat? Had that problem on my Honda
Starting to lean a little to that idea so will be taking exhaust down tomorrow to check that out, changing plugs to xp985, and doing a nice seafoam treatment hope that helps get some of the crap out of the motor, injectors, and the cats it does a good job...
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Old 09-16-2012, 10:09 PM   #20
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Misfire codes pretty much just mean the engine isn't running right. It doesn't always mean "fire" like the plugs not firing correctly. If you've already checked the fire (plugs, wires, coils), I would look at fuel. Put a fuel pressure gauge on it. Usually if a cylinder is actually misfiring, u should be able to pull a plug and actually see and smell wet fuel on the plug that hasn't been ignited. It could also be a bad O2 sensor, bad mass air flow sensor, bad injector. Misfires arn't fun, you can spend a lot trying to change parts and try to fix it. It sounds like youve already spent money on a coil that didnt work. Take it to the dealer, pay $100 diagnostic fee, let them tell you what it needs and fix it yourself. :smile:
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Old 09-16-2012, 10:12 PM   #21
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Well just read what was posted while I was typing... I'm an ASE guy myself. Understand about not wanting to take it to the dealer. But you can't beat a $100 diag. And fixing yourself. Lol. My time is worth a lot more than $100
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Old 09-16-2012, 10:18 PM   #22
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Quote:
It sounds like youve already spent money on a coil that didnt work. Take it to the dealer, pay $100 diagnostic fee, let them tell you what it needs and fix it yourself. :smile:
Nope no money spent yet :-) coils under lifetime warranty and I work ar Autozone as a manager so have all the diagnostic tools I could need or want at my disposal :-) ,
But thinks for the input... I do all my own work have been burned by to many shops, only one I trust is a place called "Just Jeeps" here in Austin, Tx and my best friends is the G.M. there and it is going there last resort.... Hate paying $80 an hour for something I can do for just my time....
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Old 09-16-2012, 10:20 PM   #23
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Originally Posted by ken78744

Nope no money spent yet :-) coils under lifetime warranty and I work ar Autozone as a manager so have all the diagnostic tools I could need or want at my disposal :-) ,
But thinks for the input... I do all my own work have been burned by to many shops, only one I trust is a place called "Just Jeeps" here in Austin, Tx and my best friends is the G.M. there and it is going there last resort.... Hate paying $80 an hour for something I can do for just my time....
Yeah i think I would do it myself too if I could "return" parts that didn't work. Lmao!
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Old 09-16-2012, 10:22 PM   #24
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Yeah i think I would do it myself too if I could "return" parts that didn't work. Lmao!
Got to love the Autozone and Oreillys lifetime warranty on certain parts
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Old 09-17-2012, 09:59 AM   #25
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Ok, lets get back to the subject. Pressure check cylinders and see if you still have a worthy engine. Curious, with engine running, stick your nose by the exhaust??? Funny no one has said anything about TIMING.
Oh, one more thing, checked all the FUSES. This is usually first with me. And why, if your'e a mech, would you shotgun plugs and wires.
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Old 09-17-2012, 10:03 AM   #26
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Are you sure one of dem Jackelope aint messin wit ya
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Old 09-17-2012, 11:06 AM   #27
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Quote:
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if your'e a mech, why would you shotgun plugs and wires.
Because coil rail was under lifetime warranty and plugs are 1.99 a peice with my discount... So I cost me $12 to do that stuff and I have had problems with the coil rail on it before...

Today did a seafoam treatment sucked it up through the brake booster vacum line, it is running a lot better, cleared the codes but still running a little weird with NO check engine light YET....

Going to get the compression and fuel pressure kit from work today or Wednesday and do it all Thursday hopefully I find nothing to scary....

If it is the fuel injectors I can get new oem ones for $28 a peice... X6 that is still a little more than I want to spend... But if it fixes it so be it....
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Old 09-18-2012, 02:13 PM   #28
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speaking of gas, can you get a Cyphen a sample of gasoline and put it in a clear glass jar and let it sit for about 5 hours and see if theres any contamination, water, mold or anything else that dont belong. Bad gas will definitely mess things up.
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Old 09-19-2012, 12:18 PM   #29
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I have narrowed it down to the cam sync and cam position sensor

I can get it for $55.99

http://www.autozone.com/autozone/par...questid=460441
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Old 09-19-2012, 12:35 PM   #30
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What tells you it is the Cam Position Sensor. I'm just dying to know.

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