WJ with 4.7

wranglerrambler

Well-Known Member
Joined
Dec 28, 2006
Location
oxford,nc
need some help...

check engine light came on. codes 0308 and 0300 (misfire cylinder 8 and random misfire; respectively). replaced plugs, deleted codes. 400 miles later, and multiple engine cycles later light comes back on with same codes. checked fuel injector and coil pack and both seem to be fine. (used multimeter). compression check showed 150 on the number 8 cylinder. any ideas???
 
what was the compression on other cylinders?
i would swap the coil and injector with another cylinder. don't swap them with the same cylinder.( put the injector on 6 and the coil on 4)
if the code comes back on 4 or 6 you will know what is at fault.
if it comes back on 8 i would suspect a valve issue, most likely a carbon issue
 
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