Misfire cylinder 1,2,3
 

OK so I have NO:

change in gas milage
change in power
change in running RPM
rough idle
loss in compression
overheating steady 205

I just have my dummy engine light on
with a code for misfire cylinder 1,2,3

So far I have changed the spark plugs and that fixed the issue once.
I have changed them again and the problem still exists.
Champion plugs .035 gap

any clues?

R they regular plugs or platinum? Platinum plugs will cause this.

hey man....x2 on plugs - don't need anything fancy, just good quality......did you check your cat? any rattling from cat? plugged up cat/exhaust can cause cylinder misfires because of exhaust/carbon buildup...... how about o2 sensors?...check exhaust manifold for cracks?....good luck!

regular OEM replacement Champion plugs

check the wires and caps. Try to swap some with others of same lenght be sure to keep them in order see if it throws a code on the ones you switched that will rule out wires if thats the problem. Other than that check the cap. I had a similar problem and the contacts had become burnt. I was a new cap so I took it back and it was good for many miles.

when you say cly 123 is that firing order or cyl count?

cylinder numbers

coil pack. no wires

took the fuel rail apart tonight and pulled the injectors. a little dirty. the fuel rail however rusted around the injectors. cleaned it all as good as it gets and put it back together. temporary fix until i order new rail and injectors.

thanks for the advice.

one of my buddys jeep has resently got this problem up backwards its firing on 1 2 and 3 but not one 4 5 and 6 1 2 3 plugs are black 4 5 6 and wet?
check all sensors changed injectors put and new cap plugs and wires on and cam sensor
engine shakes and exuast shounds like it is under water
was at a light and it starting runing this way ?

i cant figure it out any suguesstions?

Pidgin English: An extraordinary and grotesque dialect, employed in the Jeep Cherokee forums, as the medium of communication between nubians and the Forums. Its base is English, with a mixture of Portuguese and Hindustani.

Thank you. I am convinced that some members are required to pass an illiteracy test to post around here.