Ok I have a 04 Wrangler unlimited. Feels like I'm having a misfire at stop and while driving. At stop it feels like I got a cam almost....I have changed crankshaft position sensor, camshaft sensor, map sensor, idle air control throttle position sensor, coil pack , plugs, pcv elbow......checked vacuum lines.......has throwed codes for number 3 misfire cam and crank shaft sensor and oxygen sensor bank 2.......please help!!!
04 Wrangler: Misfire while driving and at stop
- Thread starter Rusty04jeep
- Start date
Does it also have that problem when the engine is cold? Or does it drive ok when cold but the misfire starts once the engine has started to warm up?
Feels like it's no different cold or hot. Just finished putting all this on and drove it feels like it has more power but the misfire feeling is still there
Sometimes the wrong technology spark plugs can cause a nearly impossible to diagnose misfire. Single-tipped platinum-tipped plugs like the Autolite AP-985 or Champion 3034 can cause such problems... single tipped meaning the platinum coating is on just one side of the spark plug gap instead of double-tipped platinums like the Autolite APP-985 or Champion 7034 with the platinum coating on both sides of the gap which work fine.
PS took it to a guy who worked for Jeep dealership before it actually started throwing codes. You could feel it but also hear it at the tail pipe.... He was lost he said
I have changed plugs like 5 times Auto lite ngk Platinums and I think this time I put Bosch in it
Bosch plugs are not good in Jeeps, they have a heat range issue because they don't make as many different heat range plug models as does NGK, Champion, Autolite, etc. Changing plugs is a crap shoot unless you know you're installing the correct type platinum plugs. Like mentioned above. Not saying your problem is caused by the wrong type but many spark plug guides used in auto parts stores incorrectly say that the wrong type plugs like the Autolite AP985 or Champion 3034 are acceptable. There's even a TSB advising techs of this issue when they encounter a difficult misfire issue.
Ok let me add this and ask a question about the plugs. Just a reminder this is not new I been dealing with this for a year and half wasn't till recently it started causing check engine codes ....sometimes I would change plugs it would clear up for a day then right back I would change something else it would clear up maybe half a day I feel like I'm chasing a ghost wasn't till the past 2 days I changed everything again but at one time. Now question it's a 04 Wrangler unlimited 6 cylinder what plugs to use for sure in it?
Exact fit doesn't mean it's a good quality sensor, it just means it'll fit.
The two at the bottom of my #4 post above. To which the Autolite XP985 iridium tipped plug can be added as a third excellent choice.
Ok will go back and try that and I guess look into a new crank shaft sensor, I was being told after all this it could be in the fuel pump or the computer itself
Hate to say that either of those could be the cause too. But try the least expensive/easiest first to eliminate them.
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