amcmike
NAXJA Forum User
- Location
- b.c. canada
i have an 90 xj 4.0 with a knock at idle only. i goes away when i bring the rpms up. its only at idle when the engine hot. its still there when i put it in gear. so its not the flex plate. i replaced the rod bearings and oil pump and its still there. i have good oil pressure. no noise from the top end,so i dont think its a lifter. it also has a new timming chain. i'm stumped? it has great power and runs good. has anyone else had this problem and figured it out? thanks mike.