Re: Jeep throwing misfire codes, need some help
Your spark plugs are fouled so a simple change to ngk or champion 4412 and you should be fine.
Your spark plugs are fouled so a simple change to ngk or champion 4412 and you should be fine.
Xs2 & NGKs.MJM said:...and disconnect the battery for 20 minutes to clear the codes out of the computer.
cdogg44 said:exhaust noise. I have somewhat of a "baseball card in bicycle spokes" noise when it's driving. The real weird thing is that coming down a big hill I could let off the gas and let the motor idle and the noise went away.
I also had that happen a few times after I installed new plugs. I gather that the computer is still adapting to the change.cdogg44 said:I also had some sort of a stumble/shake at 1900rpm that was really weird but definitely noticeable.
cdogg44 said:I stuck my head under the hood and revved the motor and the valvetrain clacking got a lot louder, however I'd never done that before and figured it was just the sound of it speeding up.
The Jeep didn't throw any codes during my 5 mile test drive, so should I just turn up the radio or keep investigating?
I tried to tighten the exhaust manifold bolts...but that is easier said than done. I did notice I would wiggle the exhaust quite a bit and was able to get some of the bolts on the small cats to tighten up.cdogg44 said:I will check the manifold bolts.
Makes sense to me on the stumble. I wound it out a little after that and it ran great so who knows.
With my head under the hood opening the throttle body by hand it sounded like the noise was under the valve cover towards the very front. But keep in mind, !. I've never listened like this before and 2. I was pretty much trying to hear valvetrain noise, so it's probably all in my head.
I don't know what it is lately but with all these failure threads around here I've been paranoid about my motor screwing up or my transmission going out. Of course with the luck I've had lately both will happen tomorrow.
X2!Stinger said:Sure sounds an awful lot like what my 05 did when the precats failed and blocked the exhaust system.
:?
JRTOffroad said:cdogg44,
Sorry to say it, but sounds very similiar to when I had a cam and lifter failure. I would recommend pulling the valve cover and checking the valve lash, if you have a cam/lifter issue the rocker will be VERY loose. Turning the engine over by hand, feel the rockers for each cylinder on its compression stroke.
BTW, my Cats were damaged from running the engine with the bad cam and had to be replaced, luckily the dealer covered this under the emissions warranty after I installed a new crane cam and lifters.
GOOD LUCK!
-Jordan
x2JRTOffroad said:cdogg44,
Sorry to say it, but sounds very similiar to when I had a cam and lifter failure.
-Jordan
Travis_ said:For me when I had the miss fire code (p0306). I changed the plugs and coil rail and tried to find exhaust leaks. All that still didn't get rid of my horrible ticking noise. It ended up being a messed up lifter and camshaft lobe.