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Old 12-27-2013, 09:28 PM   #1
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number one misfire

Hey all, new to the forum, thanks for having me. Ive got a 2002 tj sahara with 120,000 and change on it. purchased about a month ago and its been running great. About a week ago it threw a code saying misfire on number one. I dug through the forum a little and found a post about the coil rail going out so I decided to just get a new one from autozone aswell as throw new plugs in it. Sadly its still throwing the same come and has a rough idle due to the miss, but runs fine under a load and normal driving. Checked my compression today and im getting some healthy readings so I don't think its the head, head gasket, rings or cylinder. Ive also read that cheap fuel can clog my fuel system, again sadly the fuel filter is proprietary to the fuel pump. The plan for now is to finish off this tank, fill up with better fuel, from chevron most likely, put an all purpose cleaner in with that fill up to maybe clean anything up that can be. If I need to I can pull the tank and replace the fuel pump after the tank of better fuel and cleaner.


Does anyone know what this problem is? Or have any idea what my best move is?

Thanks, Wes

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Old 12-27-2013, 11:35 PM   #2
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I don't know the problem. But a bit of advice on gas. Don't buy from over priced guy that Emptys his 1000 gallon tank once a year. Go to the busy place. More less populated advice doubt it will help. But fresh gas is fresh gas brands mean little.

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Old 12-27-2013, 11:37 PM   #3
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How ancient are your plug wires?
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Old 12-27-2013, 11:44 PM   #4
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How ancient are your plug wires?
A 2002 don't have plug wires but good guess brother could be fouled plug.
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Old 12-28-2013, 12:21 AM   #5
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Thought of more but to late to edit.

Did you check your fuel pressure at the tire valve thing on the fuel rail? I'd do that before changing the pump on this issue. Happening in one cylinder don't sound like pump. Maybe injector. Additives are a waste of dough too. Good luck!
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Old 12-28-2013, 12:59 AM   #6
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Ill give the pressure test a shot, and swap the number one injector with the number two and see if the code changes. Sure wish this thing was as easy to work on as the old Datsun stuff I used to tinker with. thanks for the help and ill post my results in due time.
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Old 12-28-2013, 01:50 AM   #7
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A 2002 don't have plug wires but good guess brother could be fouled plug.
See? This is why I can't find anything under my hood anymore; it's been changed! Damned modern contraptions, no points, condensers, caps, rotors, carburetors, nothing under there looks familiar!
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Old 12-28-2013, 12:23 PM   #8
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I kinda doubt it's the gas but anything is possible. If running a few tanks of Chevron through it doesn't help, and just fill it with the normal 87 octane since 89 or 91 octane won't help, it could be a bad upstream 02 sensor which you have two of. They are a regular maintenance item & when they go bad, the mpg will drop & the engine can start a misfire.

Also, exactly what spark plug brand & model did you install? Newer 4.0L engines are very fussy about the type of spark plug they like to run well on. I know it wouldn't be causing your current misfire but the wrong plug technology (single-tipped Platinum) can cause misfires later.
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Old 12-28-2013, 04:23 PM   #9
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Had the same issue with the number 1 cylinder. Turned out to be a bad injector. At least so far anyway lol
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Old 12-28-2013, 05:25 PM   #10
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I plan on swapping my injectors tonight and ill see if it changes the code after I clear it. Im running single prong ngk plugs. What do you recommend?
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Old 12-28-2013, 05:35 PM   #11
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Single prong plugs can still have the wrong single-platinum tipped (platinum on just one side of the gap) technology.

Three good plug choices include the Champion 7034 or Autolite APP985 which are both good for 100k miles. Those are both double-tipped platinum plugs which means both sides of the gap are coated with platinum. Or the 200k mile Autolite XP985 which has an iridium coating on both sides of the gap.

Newer 4.0L engines without a distributor fire the spark plugs in alternate directions every stroke which doesn't work well with plugs that have different coatings on opposite sides of the gap.
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Old 12-28-2013, 06:28 PM   #12
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I had the same problem with my 2000. It was the plugs as it happened approx 2 weeks after I changed my plugs, you need to use the standard champion plugs nothing fancy. If that doesn't work it could be the CPS sensor. The Crankshaft positioning sensor cost approx $75 from the dealer and takes 10 minutes to put in.Good luck
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Old 12-28-2013, 07:10 PM   #13
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I love the Autolite xp985s Jerry spoke of. Bought new ones at 30,000 miles on the old xp985s pulled one and it looked so new with 30,000 miles I just put it back and am saving my new ones.
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Old 01-01-2014, 08:48 PM   #14
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I swapped the injectors and now its showing multiple misfires.
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Old 01-02-2014, 09:49 PM   #15
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With new ones or used ones? (I've seen people do it both ways lol)
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Old 01-02-2014, 10:03 PM   #16
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With new ones or used ones? (I've seen people do it both ways lol)
I took it as he was going to try an injector from a non code cylinder in the bad one and the misfiring cylinder injector in a good one but has multiple misfires now. If that helps. I'm lost now.
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Old 01-02-2014, 11:54 PM   #17
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I took it as he was going to try an injector from a non code cylinder in the bad one and the misfiring cylinder injector in a good one but has multiple misfires now. If that helps. I'm lost now.


That is what I did. It coded me with a multi cylinder misfire. Today I turn it on and let it heat up and the check engine light is off and I couldn't tell if it was missing or not.
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Old 01-02-2014, 11:58 PM   #18
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New thought. If you haven't leave your battery unhooked overnight to clear all memory's and start off fresh.
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Old 01-03-2014, 12:36 AM   #19
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Hi forum! We are lost here. Through out ideas. Anything helps!
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Old 01-03-2014, 11:13 AM   #20
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Sea Foam???

I've heard a lot of positives about the Sea Foam additive. A number of pretty believable stories about how it unstuck everything from a lifter to an injector to even a piston ring. I've never personally had a problem fixed with the stuff but admittadly my stuff is usually newer so I just use it as a preventative more than corrective. I'd say give it a shot. It's a cheap fix if it works. On another note, if you swapped the injectors and the symptom changed in any way, then that proves that they are at least PART of your problem.
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Old 01-03-2014, 11:20 AM   #21
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Misfires are seldom caused by clogged fuel injectors, I wouldn't waste the $$$ on Sea Foam.

That swapping the injectors around increased the number of misfiring cylinders would make me suspicious of how they were swapped, not that the injectors themselves were necessarily part of the problem. Our injectors are normally very reliable and misfires are normally caused by other issues.
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Old 01-03-2014, 05:15 PM   #22
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Mr. Bransford

Dude, just who do you think you are. If your so damn "All Knowing" why don't you start your own site so the rest of us will know exactly who to ask from the get-go. Then we won't have to waste our time here attempting to help each other.
Otherwise, if and when you don't agree with someone's ideas here, keep it (along with your "holier than thou" attitude) to yourself. You may indeed "Knows a couple things" but there may be "a couple things" you don't.
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Old 01-03-2014, 05:28 PM   #23
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Dude, just who do you think you are. If your so damn "All Knowing" why don't you start your own site so the rest of us will know exactly who to ask from the get-go. Then we won't have to waste our time here attempting to help each other. Otherwise, if and when you don't agree with someone's ideas here, keep it (along with your "holier than thou" attitude) to yourself. You may indeed "Knows a couple things" but there may be "a couple things" you don't.
All he did was give a logical response and his own opinion. This is a forum, after all. Everyone has their opinion, no need to go bashing someone who has an established reputation in our community.

I would also recommend heeding your own advice. If you don't agree with someone, keep it to yourself. You did say that, after all

Gonna go keep my ideas to myself now.
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Old 01-03-2014, 07:27 PM   #24
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Jerry has forgot more things about Jeeps then most people will ever know.
I've been reading most of his answers to a lot of questions and have learned a boat load of stuff.
That's how you learn.
I'm not a young buck by any means but I was told the best way to learn is to listen.
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Old 01-03-2014, 08:36 PM   #25
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I stand corrected.

Guess I'm not from around here.
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Old 01-04-2014, 12:46 AM   #26
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Guess I'm not from around here.
Uhhhhh I'm gonna guess you're not..... We like to get along around these parts.
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Old 01-04-2014, 12:52 AM   #27
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Just want to remind folks OP still needs help. I'm curious and hoping he gets a fix.

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