|
|
Post by opie on Dec 3, 2009 12:27:39 GMT -5
I need help...everything was fine until I stopped for gas...then the Jeep started running rough...by the time I got back to the office the engine light came on, then started flashing. It says P0304 on the display....I don't have a clue what to do !!
|
|
|
|
Post by opie on Dec 3, 2009 12:32:59 GMT -5
P0304(M) CYLINDER #4 MISFIRE Misfire detected in cylinder #4.
How does a mis-fire develop that quickly? Is it safe to drive, or should I call AAA?
|
|
|
|
Post by zenophryk on Dec 3, 2009 12:45:40 GMT -5
could you have gotten some bad gas? maybe a wire came off your dist. cap?
|
|
|
|
Post by opie on Dec 3, 2009 13:02:06 GMT -5
Seems unlikely that bad gas would only hurt one cylinder.....
Nothing seems loose or out of place, but I don;t know enough to really be able to tell...
|
|
|
|
Post by zenophryk on Dec 3, 2009 13:19:32 GMT -5
I agree, dosn't seem like bad gas would only affect 1 cyl. but it would explain the suddenness of the problem.
in the tech world, I use a car analogy when people ask " why did my hard drive die now? it was fine yesterday" I say, "why is my tire flat today? it was fine yesterday."
so could just be a coincidence. I just had a rear brake hose go on my ram 1500 right after stopping for gas.
|
|
|
|
Post by opie on Dec 3, 2009 13:56:10 GMT -5
Yeah, I know what you mean....I figure a bad spark plug, or fuel injector seem the most likely suspects, but with no tools and the Jeep parked in a dirt lot filled with puddles, working it out here isn't going to happen.
|
|
|
|
Post by fortyfour on Dec 3, 2009 14:47:57 GMT -5
Is there a parts place close by? Drive it there and buy a spark plug socket and rachet and pull the plug maybe. Where is the Jeep parked right now? If it's close maybe I can stop by with some tools after work.
|
|
dips
Member
Posts: 23
|
Post by dips on Dec 3, 2009 19:32:20 GMT -5
that happened on my work truck after i got gas and the code came up miss fire. it was the gas cap. the dealer told me to turn the truck off, take of the gas cap, then put it back on, then restart the truck. i did that and it was all set. just my 2 cents
|
|
|
|
Post by opie on Dec 4, 2009 15:02:13 GMT -5
So far we've looked at the coil pack, injectors, spark plugs and fuel quality and while it's better it's still not good, and it's getting more expensive by the hour !!!!
|
|
|
|
Post by ZAEDOCK on Dec 4, 2009 18:14:25 GMT -5
Check compression dude.
Pull all the plugs, disable the ignition & fuel pump, open the throttle, and crank it a few times.
Record all of the cylinders and compare.
If you find a low cylinder, squirt some oil in and re-test compression. If it goes up, it's your ring pack. If it doesn't, it could be a number of things such as head gasket, cracked head, cracked block, or damaged valve/valve seat.
|
|
|
|
Post by opie on Dec 7, 2009 7:16:02 GMT -5
OK - the plugs were put in in August - 3 of them were crispy,so new plugs and the coil pack was replaced. It ran good for about ten minutes, then the #4 injector was repalced, it ran good for about 10 minutes, the crappy again. Oddly, the mechanic decided to put the old coil back in....it's been fine ever since. First time I ever had a mechanic take new parts out, and not charge me for the time and effort. He spent 8 hours on it Friday, in the end I paid $150.00 for plugs and two injectors, parts and labor included. Could have been worse!!
|
|
|
|
Post by Carl McFly on Dec 7, 2009 11:28:38 GMT -5
He spent 8 hours on it Friday, in the end I paid $150.00 for plugs and two injectors, parts and labor included. Could have been worse!!  |
|
|
|
Post by opie on Dec 7, 2009 12:42:16 GMT -5
I know !! He's my new favorite mechanic, and that is on a VERY SHORT list.
|
|
