Wildchild467
NAXJA Forum User
- Location
- up state new york
I have a 2000 Cherokee (4.0 with the coil pack) with 127K and i notice sometimes it idles a little rough and does not seem to have the good power that my brothers jeep has. i cleaned the throttle body, put new plugs in a little while ago and it still acts the same. I checked the codes with my buddys super expensive scanner (the check engine light was not on by the way) and it said i have a #4 misfire once in a while (that i believe causes it to idle roughter). i dont think it kicks the check engine light on because it is not a constant misfire. I was driving it the other day and i it started skipping very bad and did kick the check engine light on. I got it home and it had the #4 misfire code. I changed the plugs with champions rc12ecc plugs (or whatever it said under the hood on the catylist) so i know it has the correct plug that jeep put in. before i had some other champion plug in there that advance auto gave me that said it fit my jeep. so that got rid of the skip with the new plugs, but it still lacks on the power and dosnt idle smooth. here is a quick run down of what i have... K&N filter, compression check turned out good numbers, tried 3 different coil packs (one i have on there from the junk yard now looks real good), put the correct plugs in it, cleaned the throttle body, tried different brands of fuel and grades, swapped in a different junk yard computer. my question is what else can make this #4 misfire happen? crank position sensor? injector? fuel pressure?